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Increase or decrease audio volume

Cut audio fragments

iPhone/Android ringtone maker

Enhance audio quality with AI processing

Add low-mid warmth and depth to heavily-compressed AI music. Apollo neural model preserves your highs while restoring the low-mid range. In your browser.

AI-powered voice enhancement with noise reduction, de-reverb, de-essing, EQ, compression, and LUFS normalization.

AI-powered speech restoration that makes unintelligible audio listenable again — fixes noise, muffling, reverb, and bandwidth loss.

Transform audio into retro 8-bit chiptune sound

Split audio by chapters or timestamps

Change playback speed

Change audio duration without affecting pitch

Shift pitch up or down

Apply EQ presets

Play audio backwards

Detect and remove silent segments from audio

Add silence padding to beginning or end of audio

Merge multiple files

Add reverb and echo effects to audio

Remove background noise from audio

A studio-grade dynamics compressor that levels uneven loudness, with a gain-reduction meter, level-matched A/B and LUFS targets — all in your browser.

Insert intros, outros and ads into podcasts

The most powerful audio looper online — repeat songs with crossfade, gap control, A/B section loop, fade effects, and target duration mode. Free, private, browser-based.

Lay background music under a voice-over or narration online. Auto-ducking keeps speech clear, with looping and fades. Export MP3 or WAV. Free.

Free ACX audiobook mastering tool — auto-normalize RMS, limit peaks, reduce noise, export 192 kbps CBR MP3 for Audible.

Free online music mastering — streaming loudness, true-peak limiting, reference matching, free WAV/MP3 download.

Upload all audiobook chapters to check ACX compliance and consistency

Free audio censor tool with 8 replacement types — beep, silence, reverse, pitch shift, noise and your own sound. Waveform editor with real-time preview.

AI speech recognition finds swear words and mutes exactly those words by timecode

Fix corrupted or damaged audio files

Convert between formats

Compress any audio file to reduce size

Extract audio track from video files

Convert between mono and stereo

Convert mono audio to stereo

Convert stereo audio to mono

Record vocals over a backing track

Record from multiple microphones simultaneously in separate tracks.

Convert MIDI to MP3/WAV

Find your vocal range and voice type

Transform your voice with real-time effects

Change a voice from male to female or female to male while keeping your natural delivery. Record or upload.

Remove vocals from music tracks

Convert speech to text with AI

Transcribe audio files to text

Convert text to natural speech audio

Use your device as a megaphone or PA system

Translate speech in real time between 50+ languages.

Upload audio or video, get an editable transcript, and re-voice it — change the speaker, switch voices line by line, or re-dub just one character.

Add natural harmony voices to any vocal in your browser — diatonic thirds, fifths, octaves and choir that keep your own voice. Free.

Extract or remove vocals from a song

Record voice or system audio in browser

Live audio effects and processing

Browser-based walkie-talkie communication

Create visual animations from audio

Free digital signage: fullscreen slideshows for TVs and displays. Transitions, music, widgets. Export video for offline.

Upload a song and a few short clips — the tool mutes the clip audio, keeps your music, and cuts the montage to the beat.

Trim and cut video clips in browser

Crop video to any aspect ratio or custom size

Convert any video to vertical format for TikTok, Instagram Reels, and YouTube Shorts.

Flip, mirror and rotate video files

Play multiple videos simultaneously in a grid layout

Remove audio track from video files

Add background music or audio to video

Merge multiple videos into one with smooth transitions, per-clip editing, and lossless mode. Free, in browser.

Type a script, pick a voice, and a 3D avatar speaks it with lip-sync — then download the clip as a video. Free, in your browser.

Generate AI captions for any video — lectures, podcasts, films, social. Pick a style, edit, translate, burn into MP4.

Combine 2-4 videos into one screen. Side by side, top/bottom, PiP, grid layouts. Presets for TikTok, Instagram, YouTube.

Fix corrupted or broken video files — repair containers, codecs, timestamps, and recover damaged footage.

MP4, MOV, AVI, MKV, WebM — up to 1 GB

Improve video quality with presets or fine-tune every parameter manually.

Compress video for WhatsApp, Discord, Email or set exact target size. 16 platform presets.

Extract all frames from video or assemble images into video. 5 extraction modes, WebP support, ZIP download.

Reverse any video with boomerang mode, speed control, trim, and GIF export. Browser-based.

Blur faces, pixelate areas, or censor sensitive content in your video — with AI face detection, multiple blur types, and audio censoring.

AI speech recognition finds swear words and mutes exactly those words by timecode

Upload music, a podcast, or voice recording — get a ready-made video with sound visualization, backgrounds, and text.

Drop multiple photos, add an audio track, pick a transition — get a finished video, slide deck or PDF in one click.

Merge two subtitle files into one bilingual file

Translate subtitle files to any language.

Change video speed from 0.1x to 16x. Apply speed ramps by segments with pitch preservation — all in your browser.

Boost or reduce video volume, or normalize to YouTube/podcast/broadcast loudness. Measures real LUFS and true peak, applies exact gain, prevents clipping — video stays untouched.

Convert flat video to side-by-side VR format for Cardboard and smartphone headsets

Detect fake USB drives and verify real capacity — like h2testw, but in your browser.

Clean phone speaker from water and dust with sound

Test your speakers and headphones

Test your microphone online

Diagnose microphone noise issues like hum and hiss

Test your device vibration motor with patterns, diagnostics, and a custom builder.

Test your subwoofer with tone generator, frequency sweeps, bass drops, diagnostics, and room mode calculator.

Measure your monitor refresh rate with precision frame timing. Detect Hz, analyze jitter, explore display capabilities, and test motion smoothness — all in your browser.

Check your device battery level, charging status and time remaining online

Check your screen for dead, stuck, and hot pixels with 21 test patterns and built-in repair tool

Check your phone screen for dead pixels, touch issues, backlight bleed, burn-in, and color accuracy.

Test your webcam for resolution, FPS, sharpness, noise, lighting, and color accuracy.

Test every key, detect ghosting, measure latency and typing speed

Type a phrase and we verify the output — catching autocorrect, missing letters and lag

Test your phone's gyroscope, accelerometer, and motion sensors. 3D visualization, spirit level, graphs, accuracy test, CSV export.

Test any Bluetooth audio device: headphones, speakers, earbuds, car audio. Measure latency, check speaker channels, test mic quality.

Check your printer in seconds with Quick Test or run detailed diagnostics with Professional mode. Color bars, nozzle check, grayscale, text sharpness, and more.

Measure your clicks per second with multiple modes and timers

Test your OLED or LCD screen for burn-in and image retention with fullscreen solid colors and burn-in pattern overlays.

Test every mouse button, scroll wheel, and drag tracking

Test multitouch, dead zones, ghost touches, latency and pressure sensitivity on any touchscreen device

Measure your typing speed in words per minute with real-time accuracy tracking

Check color accuracy, gamma, contrast, and gradients — all in the browser

Test your controller buttons, sticks, triggers and vibration online

Move the cursor over the test area — the polling rate appears within a second.

WebGL-based GPU benchmark that tests particles, 3D geometry, and shaders. Produces a score from 0 to 10,000. Includes stress test mode.

Test your processor speed with single-thread and multi-thread benchmarks

HDR detection, visual tests, diagnostics & scoring

Check stereo vision, motion sickness risk, IPD and find the VR headset that fits you before you buy

WebXR diagnostic suite for FOV, tracking, refresh rate, spatial audio and display dead pixels — runs inside your headset browser

Check WebXR support, GPU, CPU, RAM, sensors and bandwidth — then see which VR headsets match your hardware

Get a 0–100 score for your phone in 10 seconds — CPU, GPU, RAM, display, network, and health.

Check which audio and video codecs your browser supports — H.264, H.265, AV1, VP9, Opus, AAC, FLAC. Free, in your browser.

Free online hearing test with audiometry, speech-in-noise, and gap detection. Get your audiogram and hearing age.

For best results, use a screen with good color reproduction at full brightness in a well-lit room. Turn off night mode, True Tone and blue-light filters, which shift colors and can invalidate the test.

Online dyslexia screening with 5 assessments and PDF report

Cognitive function screening — test attention, memory, reaction time and spatial reasoning

Free scientifically-designed IQ test with adaptive matrices, spatial reasoning, and pattern recognition. Get accurate IQ score with confidence interval.

Online dementia screening test — assess memory, attention, orientation and cognitive health

Comprehensive vision screening with 8 tests for phone and computer. Visual acuity, near vision, astigmatism, contrast, Amsler grid and more.

Take a selfie holding a bank card on your forehead, mark the card and your pupils, and read your PD for ordering glasses.

Check your mental sharpness with 7 scientific assessments. Find out your mental age.

Comprehensive autism screening with social, sensory, and masking analysis.

Records and analyzes snoring through your microphone. Get a morning report with Snore Score, loud episodes and trends.

Clinically validated depression screening with mood tracking, wellness toolkit, and PDF report.

Free adult ADHD test based on the WHO ASRS-v1.1. A 6-question screener with an instant result, plus the full 18-item checklist. Not a diagnosis.

Free tinnitus test: match the frequency of your ringing, find masking noise that covers it, and check the impact. Headphones recommended.

Pick a template or build your own. Your routine follows the device clock, counts down to the next event and runs in the background.

A period and ovulation calendar whose forecast shows a range instead of one date.

Guided breathing techniques for relaxation and focus

Anxiety tracker and mood diary — log levels, triggers and coping strategies

Instant emergency calming tool for panic attacks with guided breathing and reassuring voice.

Virtual sensory room with calming visuals and ambient sounds for self-regulation and relaxation.

Generate or fix color palettes so they remain distinguishable under all forms of color vision deficiency.

Upload an image to compare original and colorblind views side by side.

Allow camera access, choose a CVD type and mode, then see the live filter.

Use your camera, upload an image, or enter a color value to identify any color.

Choose a starting point and date to get your estimated due date, gestational age and trimester.

Get audio file info

Deep forensic analysis of audio files

Detect tempo, key, Camelot and time signature

Upload an audio file to identify its genre, mood, dominant instruments, BPM and musical key.

View and edit audio file metadata tags

Analyze audio for signs of editing, splicing, or AI generation.

Find splices, cuts and edits in audio recordings using six forensic detectors with millisecond precision.

Embed invisible watermark in audio to prove ownership

Slow any sound down to 500x without changing pitch and inspect it under a live spectrogram with note and frequency readout. Free.

Transcribe any audio recording into notes, MIDI, and sheet music using AI.

Scan any score photo or PDF and hear the notes back.

Convert Guitar Pro (GP3-GP7, GPX) and MusicXML tabs to MIDI in your browser. Pick tracks, preview, and download. Free.

Compare two audio files side-by-side with objective metrics — LUFS, spectrum, dynamic range, ABX blind test, sample-level diff.

Hear your audio in 60+ environments

Generate white, pink and brown noise

Generate silence files with comfort noise options

Brainwave entrainment with binaural frequencies

Generate loud creepy sounds or boost audio up to 400%

Create custom alarm and notification sounds

Generate doorbell sounds, chimes, and melodies. 35 presets, custom synthesizer, melody composer, multiple export formats.

Brainwave entrainment with pulsing isochronic tones

Generate precise audio tones, sweep frequencies, mix oscillators, play DTMF phone tones, export WAV. Web Audio API.

Generate and decode telephone touch-tones with ITU-T Q.23 precision — keypad, sequence player, microphone decoder, multi-region call-progress tones, WAV/MP3 export.

Generate ultrasonic frequencies beyond human hearing. Up to 48 kHz with 96 kHz sample rate. Real-time spectrum analyzer.

Convert text to Morse code audio

Silent ultrasonic whistle for dog training

Ultrasonic dog repellent with siren and auto-off timer

Ultrasonic rodent repellent sound generator

Ultrasonic cockroach repellent with anti-habituation patterns

Generate deterrent sounds in the 1–5 kHz bird hearing range — 8 synthesized modes, species targeting, anti-habituation timer.

Use your camera as a mirror with zoom, filters and screenshot

Record your screen, browser tab, or window directly in the browser.

Record yourself on your webcam and microphone, then download the video.

Offline travel phrasebook with emergency and disaster phrases in 20 languages, audio, romanization and local emergency numbers. Free, in your browser.

Track aircraft in real time on a live map and find any flight by number — with altitude, speed and aircraft type. Free, in your browser.

Create a tamper-proof certificate that timestamps when your file existed — RFC 3161 trusted timestamp, verifiable by anyone. Free.

Register an e-bike or check if one is stolen

Build numbered event tickets with QR codes, print up to thousands at once, then scan them at the door to check guests in. Free, in your browser.

Decode Morse code to text

Measure the straight-line distance between two cities, with bearing, midpoint, flight time and a map.

Keep Bluetooth & audio devices connected

Keep your screen on and prevent it from sleeping — online tool

Set alarms and timers with custom sounds

Generate random numbers, roll dice, flip coins, pick from lists, create passwords. Crypto-secure, instant, free.

Generate random words, letters and ideas for games, writing prompts and brainstorming. Instant and free.

Generate customizable QR codes for URLs, text, WiFi, vCard, email, SMS, phone, WhatsApp, and locations.

Turn your screen into a flashlight — with strobe, SOS, Morse code, countdown flash, and ambient lamp modes.

Encrypted diary, password manager and file safe — AES-256-GCM encryption in your browser via Web Crypto API.

Type a secret, get innocent-looking text to send anywhere; paste it back to recover the exact message.

Create barcodes in 16 formats. Download crisp SVG or PNG, or print directly.

Scan any barcode or QR code from camera or uploaded image. Get product info, links, and more.

Overwrite files with random data before deletion — make recovery impossible. Works on USB drives, SD cards, and any folder. No software to install.

Hide secret text, files, or images inside pictures using LSB steganography. Optional AES-256 encryption.

Count days since the last incident, track your record, and show it full-screen, in print or by link.

Browse 1400+ curated names for dogs, cats, parrots, hamsters, rabbits, fish, turtles, horses, reptiles, ferrets, guinea pigs and birds — filter by gender, style, popularity and length.

Digital spirit level using your phone's sensors — 2D surface bubble, inclinometer, plumb line and camera AR with angle export.

Online protractor with transparent overlay and photo measurement — mm calibration, multi-angle, PNG/PDF/JSON export. Handy for builders, carpenters and students.

Free online ruler in actual size. Calibrate to your screen and measure in cm, mm and inches — on screen or on a photo.

Convert BIN/CUE disc images to ISO

A digital inclinometer that reads tilt in degrees, percent, per-mille and roof pitch — plus a clinometer mode for the height of trees and buildings.

Find, view, and share your GPS location with an interactive map and compass.

Share your live location with people on a map, in real time — right in the browser, no app.

Check if your VPN is working and test for IP, DNS, and WebRTC leaks. Instant anonymity score with detailed results.

Look up any IP address or domain to see its location, ISP, VPN status, and more.

Hash any file with 6 algorithms. Verify downloads, compare files, find duplicates.

Encrypted, no signup, peer-to-peer — share a link and chat privately.

Test your IPv6 support, detect connection type, compare latency, and check for leaks.

Scan any website to discover all cookies, trackers, and privacy risks in seconds.

Measure download and upload speed, ping, jitter and latency under load (bufferbloat) in 30 seconds.

Run 25+ privacy and security checks on your browser. Get a score from 0 to 100 with detailed results and recommendations.

Real entropy bits, live cohort comparison, defense test, and visual fingerprint art — see exactly how trackable your browser is.

Instantly detect your browser, OS, screen, hardware, codecs, and web API support. Copy all info for tech support or download a PDF report.

Check if WebRTC is exposing your real IP address. Detect local, public, and mDNS candidates with real-time monitoring.

Watch 20 world statistics update live: population, environment, energy, technology, economy.

Check CPU, GPU, memory, battery, storage, network, and browser capabilities. Get a health score, run a benchmark, and receive personalized recommendations.

Look up DNS records for any domain. All record types supported, results from multiple resolvers.

Look up registration details for any domain name including registrar, dates, nameservers, and DNSSEC status.

Enter a domain to inspect its HTTPS certificate: who issued it, when it expires, whether the chain is complete and which TLS versions the server accepts.

Enter a URL to see the full redirect chain with HTTP status codes, response times, and server details.

Identify the manufacturer of any network device by MAC address, generate random MACs for testing, and convert between all standard formats.

Drop a file or folder, share the 6-letter code or QR — the transfer flows directly between browsers.

Share your screen with anyone via a link or 6-letter code. No camera, optional voice, nothing to install.

Pick your passport — we show every destination, sorted by entry requirement.

Online memory game for brain training and cognitive exercise

Online snake arcade game with 4 modes, power-ups, and themes

Navigate procedurally generated mazes with increasing difficulty. Four modes from easy to extreme.

Push all boxes onto the goal markers. 155 hand-crafted levels from easy to expert.

Slide tiles with arrow keys or swipe. Merge matching numbers to reach 2048!

Free volleyball game for two players. Play against AI, together on one keyboard, or online with friends.

Play the Russian Durak (Fool) card game

Toggle lights to turn them all off. Clicking a light flips it and its neighbors.

Slide numbered tiles into the correct order. Choose 3x3, 4x4, or 5x5 grid size.

Fill the entire board with one color in the fewest moves possible.

Use number clues to fill cells and reveal hidden pixel art pictures. 20+ puzzles from easy to hard.

Rearrange seven shapes to match the target silhouette. Drag, rotate with R, flip parallelograms with F.

10 interactive browser games designed for cats to play on tablets, phones, and screens.

A fun jumping game for kids — help a cute cat bounce from platform to platform and reach for the sky.

Rotate pipe segments to connect the water source to every endpoint. Tap or click to rotate.

Play the classic dinosaur runner game — jump over obstacles and set your high score

Free air hockey game with single player, local and online multiplayer modes, power-ups, and 4 table themes.

Free turn-based artillery duel with 18 weapons, wind and destructible terrain — play vs computer, 2 players, or online.

Drop wooden shapes onto the grid, clear lines, and beat your record.

Play tic tac toe online against smart bots or with friends by shareable link

Name a city; the next must begin with its last letter.

Play checkers online — Russian, international, American or English rules, vs AI bot or by shareable link

Play chess online against the engine with hints and undo

Browser remake of the Soviet LCD handheld — catch eggs in the basket

Virtual pocket pet to feed and care for

Daily Trail logic puzzle — connect numbered points

Detect AI-generated audio content

Measure noise level in decibels

Record audio continuously for hours.

Turn any device into a security camera with motion detection, recording, and remote viewing. P2P, free, no sign-up.

Browser-based baby monitor with cry detection

Press Start Camera to activate your camera. The tool will convert light levels into audio tones.

Play acoustic guitar with realistic sound synthesis. 70+ chords, strum and arpeggio modes, 5 tunings, recording.

Microphone-based guitar tuner with real-time pitch detection. 6 tunings, A4 reference, ±1 cent accuracy.

Interactive 88-key virtual piano with 5 voices, MIDI input, recording, learn mode, and chord/scale assistance. Free, no signup.

A dual-engine virtual organ: tonewheel Hammond with drawbars, Leslie and percussion, plus a pipe/church organ with stops and cathedral reverb.

Virtual kalimba with step sequencer, 8-track looper, reverb, delay, Web MIDI in and song library.

AI-generated endless piano music for focus and relaxation

Create beats and music patterns in your browser

A live-playable drum kit with WebMIDI, recording, metronome, grooves and lessons — no signup.

Scan your PC hardware and get a gaming readiness score with recommendations.

Measure your reaction speed in visual, audio, and reflex modes with millisecond precision.

Practice your mouse aim with 4 game modes and difficulty levels

Measure your network latency to game server regions worldwide

Measure the delay from mouse click to visual response with detailed lag breakdown.

AAC communication board with symbols and keyboard for nonverbal communication

Visual metronome for speech pacing with breathing coordination and recording.

Visual daily schedule with icons, timers, and transition alerts for autism and ADHD.

Customizable reading aid with dyslexia fonts, spacing, focus cues, overlays and text-to-speech.

Visual reading ruler and color overlay to help with dyslexia and visual stress.

Camera color identifier for blind and visually impaired users

Pick two colors to check contrast ratio and colorblind visibility.

Free live captions in your browser. See speech as text in real time.

Monitor loud sounds remotely.

Search and learn sign language visually.

Practice fingerspelling in 8 sign languages with interactive quizzes and hand shape diagrams.

Turn music into phone vibration in time with the beat.

Upload a PDF, DOCX or TXT and listen to it as an audiobook — with bookmarks, sleep timer and sentence-by-sentence navigation.

Turn images into musical melodies or pure spectrogram sound.

Navigate by sound with a 3D spatial audio compass.

Virtual keyboard optimized for single-hand typing with large keys and word prediction.

Control this page with voice commands: scroll, click, go back, and more.

Enter the rise to climb and pick a slope ratio to get the ramp length, run, slope percent and angle.

Convert video clips to animated GIF images

Compress GIF files online — reduce size with lossy optimization, color reduction, and frame control

Free online GIF trimmer with frame-level precision and automatic loop detection.

Add music or sound effects to any GIF. Convert to MP4/WebM with audio. Waveform editor, trim, fade in/out, sync modes. Free, no watermark.

Calculate voltage, current, resistance, and power instantly. Interactive Ohm's Law wheel, animated circuit diagram, and practical presets.

Decode resistor color bands or find band colors by resistance value. Interactive SVG, 4/5/6 bands, tolerance range, E-series matching.

Decode 3-digit capacitor markings to pF/nF/µF or find the code from a capacitance value. Voltage ratings, tolerance codes, unit converter.

Decode SMD component markings — 3-digit, 4-digit, and EIA-96 codes for resistors and capacitors. Reverse lookup and package size reference.

Calculate the current-limiting resistor for any LED circuit. Color presets, series/parallel arrays, power warnings, nearest E24 value.

Calculate voltage divider output, find R1/R2 from desired Vout, E24 matching, load effects, tolerance analysis, and power dissipation.

Find the right wire gauge for your project. AWG↔mm² converter, voltage drop calculator, ampacity tables, copper and aluminum support.

Calculate minimum PCB trace width for a given current using IPC-2221 standard. Supports internal/external layers, multiple copper weights, and voltage drop.

Calculate NE555 timer circuits — astable and monostable modes. Frequency, duty cycle, waveform preview, and reverse component calculation.

Build and simulate electronic circuits in your browser. Drag-and-drop components, draw wires, real-time voltage and current readouts.

Measure a battery on your calibrated screen, or print a true-to-size gauge — then read which battery it is.

Free online timer: run several labeled countdowns at once, plus Pomodoro and HIIT interval modes, fullscreen, and alarm sounds.

Six clock types with educational guides and timezone support.

Precise online stopwatch with laps, splits, sparkline and shareable link

Live countdown timer to any date with themes, full-screen and shareable link

Set a duration and watch the sand run through the glass.

Convert Unix timestamps to ISO 8601, UTC, RFC 2822 and relative time, or any date back to epoch seconds. Batch mode and live counter. Free.

Convert between 24-hour military time and 12-hour AM/PM format with live sync, batch mode and reference chart.

Light a virtual candle and observe a moment of silence to honor someone's memory. Timer, ambient sounds, personalization.

Visual countdown timer for ADHD time blindness with event tracking and alerts

Free chess clock for two players on one device — Bullet, Blitz, Rapid, Classical with Fischer, Bronstein and delay modes.

Set multiple cooking timers with preset recipes and sound alerts.

Find the exact battery for your watch by model.

Focus, color, geometry, contrast and convergence patterns. Control from your phone via QR code.

Find the right placement for any projector. Works with raw throw ratio — no model lookup required.

Diagonal to width × height for any aspect ratio, plus optimal viewing distance per THX (36°) and SMPTE (30°).

Five focus patterns to lock perfect sharpness on any projector. Fullscreen, keyboard and swipe nav.

Adjustable fullscreen grid with edge markers for keystone, lens shift and geometry calibration.

Get the recommended ANSI lumens for your screen size, room lighting and content type (SDR/HDR).

Eight calibration points from warm 2700K tungsten through D65 daylight to 9300K cool. Fullscreen with keyboard nav.

Side-by-side gamma reference patterns for 1.8, 2.2, 2.4 and BT.1886. The 1px-stripe half should blend with the reference grey at correct gamma.

Tell us your budget, room and use case. Get a clear recommendation with a side-by-side comparison.

Resolution-aware calculator. Tells you minimum, optimal and maximum seating distance for your screen — 4K lets you sit closer than 1080p.

Synchronised flash + click. Record on your phone, count frames between flash and audio peak, multiply by 16.7 ms.

Pick a duration, press Start. Huge digits fill the projector — readable from anywhere in the room. Beeps at countdown < 10 s and at zero.

Top-down diagrams for each system. Shows correct angles per Dolby/THX standards: front 30°, surround 90–110°, rear 150°, height ±45° elevation.

Auto-cycles colour fields, gradients and motion patterns for the duration you set. Helps equalise panels on a new LCD or DLP projector.

Total cost of ownership over the period you choose: purchase + replacement lamps + electricity. Reveals whether a lamp or laser projector saves money for your usage.

Point your phone camera at the projected image. Get live RGB histogram, white balance check, 9-zone uniformity score, and clipping detection.

Five test patterns for 3D projector calibration: anaglyph, L/R separation, depth, crosstalk, convergence. Wear your 3D glasses (red-cyan or active shutter).

Soft-edge gradient overlap pattern for multi-projector setups. Adjustable overlap percentage, gamma-correct ramp, four edges.

Calculates LED strip length, recommended brightness, and the right colour temperature for the bias light behind your screen.

Specifies the right grey paint (Behr or Sherwin-Williams) for your room lighting and calculates how much paint, primer and pearl additive you need.

PQ-encoded test patterns for HDR projectors: nit-step ramp, clipping check at 800–1500 nits, near-black detail, peak-white reference, Rec.709 vs Rec.2020 gamut comparison.

Microphone-based sound-level meter with A-weighting. Place phone 1 m from projector, press Start, get peak/avg/min readings.

Convert HEIC/HEIF photos to JPG, PNG, or WebP

Turn old black-and-white photos into colour with AI, right in your browser.

Resize photos for 12 social platforms — Instagram, TikTok, Facebook, YouTube, and more. Smart crop, blur background, batch download as ZIP.

AI ×4 upscaling and resolution boost, plus optional sharpen, contrast and saturation for quality. All in your browser.

Capture your screen, paste from clipboard, or upload an image — annotate, crop, blur and export.

Swap the faces of two people in one photo. Auto-detects and aligns both faces, with manual fine-tuning. Free, in your browser.

Design click-worthy thumbnails and video covers — bold outline text, photos, presets, photo tweaks and a true-resolution export, all in your browser.

Diagnose JPEG corruption, repair file headers, denoise old scans and recover photos that won't open.

Stamp text, logo, or diagonal tiles on a single photo or a whole batch — with optional Content Credentials.

Drop a JPEG signed by Tembrica Photo Watermark — verify the signature.

Upload a front-facing portrait — your face is fitted to the size of the document you pick.

Count words, characters, sentences, paragraphs. Readability scores, keyword density, social media limits. Free, runs in your browser.

All-in-one text formatter: 60+ operations for case conversion, cleaning, encoding, fancy text. Free, private, in browser.

Check Russian and English punctuation, commas, dashes and spelling — with rule explanations and one-click fix. Russian has an advanced in-browser spell-checker.

Convert between 12 keyboard layouts with auto-detection — QWERTY, Cyrillic, Korean, Arabic and more.

Browse 1 940 Unicode emojis with names in 9 languages. Search by paste, hex or :shortcode, copy in one click, download SVG/PNG. Free.

Check any text for profanity and censor swear words across 9 languages.

Beautify, minify, and validate JSON in the browser. Live error line/column, 2/4/Tab indent. Free, no signup.

Compare two texts side by side. Line, word and character-level diff with insertion/deletion highlighting. Free, in your browser.

Generate Lorem Ipsum placeholder text in paragraphs, sentences, words or bytes. HTML or plain output. Classic, hipster, or random variants.

Parse and explain cron expressions. See the next 10 run times in your timezone, with human-readable description and field breakdown.

Generate URL-friendly slugs from text. Transliterate Cyrillic and Latin diacritics, choose separator, strip stop words, set max length.

Parse, edit and build URL query strings. Visual table editor, automatic encode/decode, array notation, JSON export.

Convert between JSON arrays and CSV files. Auto-detect direction, configurable delimiter, type coercion, header row toggle. Free, in browser.

Beautify or minify HTML in your browser. Indent options, comment removal, void-element handling, preserves <pre>/<script>/<style> content.

Live Markdown editor with GitHub-flavored preview. Side-by-side, sync scroll, export HTML, all in your browser.

Format, validate, and convert YAML in your browser. YAML ↔ JSON bidirectional, indent options, multi-document support.

Turn any text into ASCII block art. Pick a font (Banner, Big, Standard, Bubble), copy, paste into chat or code comments.

Basic and scientific modes, voice readout in 9 languages, large buttons and a running paper-tape — built to be easy for seniors, children and everyone else.

Percent of a number, percent change, discount, tip, VAT, markup

Free age calculator: your exact age in years, months, days, hours, minutes, seconds — plus next birthday countdown. Free, in-browser.

Days between two dates, business days and holidays

See exactly how many days you have lived since birth — with weeks, hours, a live counter, milestone dates and your life in weeks. Free.

Add your Schengen trips — see days used, days left and your must-leave date.

Free work-hours calculator: enter shifts with start, end and breaks, get weekly totals, overtime and pay. Export CSV. Free, in-browser.

Free sleep cycle calculator: best bedtime to wake up rested, or when to wake if you sleep now. Age-based targets, nap timer, 90-min cycles.

Wrist → ideal case diameter, lug-to-lug, strap width

Calculate blood alcohol content from drinks

Convert between Julian and Gregorian dates

Enter the floor-to-floor height and get the riser height, tread depth, stair angle and stringer length, with comfort and code checks.

Enter the room size and the tile size, add a waste margin, and get the number of tiles and boxes to buy.

Enter the room size, the number of coats and the paint coverage, and get the litres or gallons to buy.

Enter the room size, the roll size and the pattern repeat, and get the number of rolls to buy.

Enter the dimensions of a slab, footing or round column and get the concrete volume and the number of pre-mix bags.

Enter the board thickness, width, length and quantity to get the board feet per board, the total and the cost.

Enter the fence length and post spacing to get the posts, sections, rails and pickets you need.

Enter a distance and the time it took to get your pace, speed and predicted race finish times.

Enter your original and new tire sizes to see the diameter change and how far the speedometer will be off.

Add each course with its letter grade and credit hours to get your credit-weighted GPA.

Set your sensor, focal length, aperture and focus distance to see the depth of field and focus limits.

Pick the exposure without a filter and the ND filter you are using to get the corrected shutter speed.

Enter the image pixel dimensions to find the print size at a chosen DPI, or the DPI at a target size.

Pick a category and your size in one region to see the matching size everywhere else.

Draw pictures online with brushes, shapes and colors

Write a book together: start a story or add a page to someone else's. Append-only, your page editable for 24h. For writers and readers. Free.

A free tool to draw in the air with your hand: a hand-tracking model follows your fingertip and a neon brush paints the line. Pinch your fingers to draw, open them to stop.

Analyse poems: detect metre (iambic, trochaic, dactylic), rhyme scheme, syllable count and spellcheck. For students and writers. Free.

Create stereoscopic 3D pictures from photos

Measure a needle or hook on your calibrated screen, or print a true-to-size gauge — then read its mm, US and UK size.

Adjust the ring, gear and pen sliders to draw geometric spirograph curves.

Draw on the canvas — every stroke is mirrored into a symmetrical kaleidoscope pattern.

Convert between HEX, RGB, RGBA, HSL, HSLA, HWB, LAB, LCH and OKLCH. Shade and tint palette, WCAG contrast check, eyedropper.

Filament + electricity + wear — drag in an STL or type the volume

20+ material presets — PLA, PETG, ABS, TPU, Nylon, carbon-filled and more

Layer-by-layer toolpath, time and filament estimates

Image → grayscale height map → STL — flat or curved

Parametric STL + G-code with M104 per segment — any printer, any filament

Parametric bins and baseplates — export STL for any 3D printer

XYZ cube, retraction tower and flow tower — parametric, export STL

AI depth or turntable silhouettes — export STL, slice and print

Generate strong random passwords

Generate strong diceware passphrases

Check password strength and crack time

Check if a password appears in known data breaches

Generate TOTP 2FA codes from an otpauth secret

Decode otpauth:// QR codes and 2FA secrets

Audit a password list for weakness and breaches

Open and view KeePass .kdbx databases

Convert Bitwarden exports between formats

Split a secret into K-of-N reconstructible shares

Share a secret via a self-destructing link

Generate PGP/GPG key pairs

Convert cooking measurements with ingredient-specific accuracy.

Paste a recipe, change the serving size, get rescaled ingredients instantly.

Track household income and expenses with visual charts and 50/30/20 analysis.

Create a personalized cleaning schedule for your home with tasks and time estimates.

Measure a screw on your calibrated screen, or print a true-to-size paper gauge — then read its diameter, thread pitch and length.

Measure a drill bit on your calibrated screen, or print a true-to-size gauge — then read its metric and inch size.

Measure an O-ring on your calibrated screen, or print a true-to-size sizer — then read its inner diameter and cross-section.

Measure a hex key on your calibrated screen, or print a true-to-size gauge — then read its metric or SAE size.

Measure a nail on your calibrated screen, or print a true-to-size gauge — then read its penny size, length and shank thickness.

Print this 1:1 card, hold a bundle of dry spaghetti against a circle, and serve the exact portion every time.

Pick the pan a recipe was written for and the pan you want to use — get the factor to scale the recipe by.

Enter a temperature in °C, °F or gas mark and get every other oven setting at once.

Count the syllables in any English word or text. Dictionary-accurate, with a poetry mode for haiku. Free, in your browser.

Find which syllable to stress in any English word. Shows the stressed syllable, IPA and noun/verb pairs like REcord vs reCORD. Free, in your browser.

Train your ear on tricky English sounds — ship vs sheep, light vs right. A minimal pairs listening drill, in your browser.

Estimate how many English words you know. A quick, science-based vocabulary size test with a CEFR estimate. Free, no sign-up.

Paste a word list and build a real Anki .apkg deck — with IPA, audio and a built-in study mode. Free, in your browser.

A new English word each day with translation, meaning, examples and audio. Save and review words with spaced repetition. Free, in your browser.

Listen to graded English sentences and type what you hear. Word-by-word error highlighting, A1–C2 levels, adjustable speed. Free, in the browser.

Hear an English word and spell it. Four difficulty tiers, example sentences, letter-by-letter error marking and a streak counter. Free.

Hold the vowel like a long, steady note — don't say the consonants around it. Record somewhere quiet for the clearest reading.

Practice language shadowing with audio prompts

Adaptive English level test: vocabulary, grammar, reading and listening. Get your CEFR level with IELTS and TOEFL equivalents. Free, no signup.

Convert between CEFR, IELTS and TOEFL levels

Generate gap-fill exercises from any text

Practice English irregular verbs

Practice English phrasal verbs

Practice English word collocations

Spot false-friend words across languages

Timer for IELTS Speaking Parts 1, 2 and 3

Learn English grammar by CEFR level A1–C2. Free course with clear lessons, exercises and progress tracking, in your browser.

Download or generate sample video for player testing — 1080p / 4K H.264 MP4 catalogue plus on-the-fly WebM and MP4 via MediaRecorder.

Download or generate sample audio for testing — 1 kHz tone, pink noise, custom sine/white/pink at 44.1/48/96 kHz, 16/24-bit, mono/stereo WAV.

Generate dummy files of any size from 1 KB to 10 GB. Zero, random, text or pattern bytes, custom extension, instant browser download.

Generate test images for QA — colour bars, grayscale, gradient, checker, grid up to 4K. Export as PNG, JPEG or WebP with adjustable quality.

Generate test PDFs in your browser — lipsum text, multi-page sections, big table or blank. A4/Letter/Legal/A3, up to 500 pages, custom title.

Generate sample documents in browser — CSV, JSON, XML, RTF, Markdown, TXT with deterministic rows. Custom row/column count up to 100 000.

Download codec test files — H.264, H.265 HEVC, AV1, VP9, VP8 in MP4 and WebM. Verify your player and pipeline support with live browser probe.

Generate log or linear sine sweep WAV files for REW, ARTA and room measurement. 20 Hz–20 kHz, 44.1/48/96 kHz, 16/24-bit, full channel routing.

TV calibration patterns for projectors and displays — SMPTE bars, PLUGE, grayscale, focus star, HDR window, overscan. PNG up to 8K plus MP4 loops.

Generate corrupted test files for error-path QA — truncate, zero magic bytes, bit-flip, zero middle or rename extension. Browser-based.

Register a robot and get a digital passport with TRID

Convert between quaternions, Euler angles and rotation matrices

Calculate required servo torque from payload and lever

Compute steps/mm for 3D printers and CNC firmware

Calculate gear ratio, RPM and torque for gear trains

Find LiPo pack voltage, runtime and discharge current

Compute robot linear speed and odometry from wheel data

ISO 13855 protective separation distance for cobots

Tune PID gains and visualise step response in real time

Design and print line-follower robot race tracks

Visualise URDF robot links, joints and meshes in browser

Explore robot arm poses with DH parameter sliders

Browser-based serial monitor for Arduino and ESP32

Look up robot vacuum error codes and fixes instantly

Type either box to convert. Switch modes for dates, a Roman clock, lessons, or a quiz. The chart stays visible.

Pick a level, fill in the answers, and tap Check. Earn coins, open chests, and unlock new worlds.

Converts primary points to test scores using the official scales and helps you grade a mock exam by task and by the official FIPI criteria — the way an examiner does.

Practice touch typing with progress tracking

Interactive alphabet guide for 12 languages. Click any letter to hear its pronunciation. Learn mode + quiz mode.

Spell numbers and amounts with real grammar — seven languages, currency, ordinals, cheques and batch mode.

Free adaptive logic puzzles for kids 5–12: patterns, odd-one-out, analogies, shapes, and deduction. Voice narration and a parent skill report.

Pick an animal and a source, then drag the slider to compare your vision with theirs.

Interactive 3D Earth globe with real-time day & night, sun position, country search and live ISS tracking. Free, in your browser.

A live map of recent earthquakes worldwide from USGS and EMSC — magnitude, depth and time for each quake, updated continuously. Free.

A live map of active wildfire hotspots worldwide from NASA satellites — heat detections from the last 24 hours, ranked by fire power. Free.

Track satellites live on a map, see Starlink, and find out when the ISS will pass over your location — propagated in your browser. Free.

Find sunrise, sunset, golden hour, day length and the moon phase for any location, with live sun and moon directions on a map. Free.

See the next meteor shower, a live peak countdown, and whether the radiant is up, the sky dark and the moon out of the way for your location. Free.

See light pollution on a map and tap anywhere for the exact night-sky brightness in mag/arcsec² — find the darkest skies near you. Free.

Watch live animated wind across the globe from the GFS model — wind speed and direction anywhere, with a reading for your own location. Free.

A digital tasbih with target presets, multi-dhikr tracker and progress memory.

Today's Islamic date, two-way date converter, and a monthly Hijri calendar with holidays.

Enter your assets and liabilities in any currency; the calculator checks Nisab and computes 2.5%.

Live mobile compass, exact bearing to the Kaaba, and distance to Mecca.

Five daily prayers with multiple calculation methods, Asr madhab choice and a live countdown.

Work out how many obligatory prayers you have missed and track making them up, day by day — with madhhab support.

A counter for the Jesus Prayer on a prayer rope (chotki), with knot presets, cycle counts and memory for today and all-time.

Work out the 9th and 40th day, half-year and anniversary from the date of death, plus parental Saturdays and Radonitsa for any year.

Light a virtual candle in memory of someone you love — add a name, dates, a photo and a few words. Candle, dua or quiet light.

Test Nintendo Switch Joy-Con controllers

Full Steam Deck hardware test — display, controls, battery

Test Steam Deck controls, sticks and triggers

Test Steam Deck screen for dead pixels and color

Test what works in the PlayStation 5 browser

Test PS5 DualSense buttons, sticks and triggers

Test what works in the Xbox Edge browser

Test Xbox controller buttons, sticks and rumble

Test your connection for cloud gaming

Click one button and watch a single live world counter tick upward together. Back your country in the daily click battle. Free, in your browser.

Live night sky — Sun, Moon, planets and constellations in real positions for Moscow. Auto-updates every 5 minutes.

Doodle face constructor for kids — mix parts, roll the dice, print or share

Pick an element and paint on the canvas. Watch sand fall, water flow and fire spread.

Click or drag across the sheet to pop bubbles. They grow back, so the popping never ends.

A playful lie detector game: a prank truth/lie scanner, a voice nervousness meter and party questions. Not a real test — just for fun. Free.

Online tarot with the Rider-Waite-Smith deck: 6 spreads, upright and reversed meanings, voice reading and a journal. Free.

Analyze sonograms and spectrograms of wildlife sounds: birds, bats, whales, frogs, insects.

Free browser-based gel electrophoresis image analyzer with 20+ built-in ladders.

Complete DNA/RNA sequence analysis toolkit — free, in your browser.

Automatic cell counting and microscopy image analysis — free, in your browser.

Encode and decode Base64 in the browser. UTF-8 safe, URL-safe variant, file uploads. Auto-detect direction. Free.

Encode and decode URL strings in the browser. Component vs full-URL mode, + for space, auto-detect. Free.

Test JavaScript regular expressions in the browser. Highlight matches, see groups, preview replacement. Free.

Decode and inspect JSON Web Tokens in the browser. Header, payload, expiry, claims explained. No signing. Free.

Generate UUID v4 (random), v7 (time-ordered), v1 (timestamp) or Nil UUIDs in your browser. Bulk, formatted, validated. Free.

Calculate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 hashes for text or files in your browser. HMAC, hex or base64.

Identify the algorithm behind any hash: MD5, SHA-256, bcrypt, Argon2, NTLM and 50+ more. Ranked matches with hashcat & John modes. Free.

Sign PDF documents with a digital signature

Verify a PDF document's digital signature

Rearrange or remove pages of a PDF with a drag-and-drop visual editor. Preserves bookmarks and page labels. Browser-only, free.

Enter a noun and get it in all six cases, singular and plural, with stress marks and audio.

See how any Russian letter or word is written in cursive, play the writing animation and print a tracing worksheet.

Convert Cyrillic to Latin in 9 standards side by side — passport, GOST, ICAO, BGN/PCGN and more. Compare them, reverse the conversion, export a PDF name card.

Automatically place stress marks on Russian text, pick the variant for homographs, and restore the letter ё.

Automatically restore the letter ё in Russian text: clear cases instantly, ambiguous ones are yours to choose.

Look up the feminine form of any profession in 6 languages — Russian, German, French, Spanish, Portuguese, Arabic — with honest usage tags. Free.

An adaptive test estimates how many Russian words you know from your "know / don't know" answers.

Measure the lug width on your calibrated screen, or print a true-to-size gauge — then order the right replacement strap.

Pick a method below. Everything runs in your browser.

Estimate the automation risk of any profession with multi-source 2026 data.

Free RIASEC career test for teenagers. Discover careers that fit your interests, with real pay, job growth and AI outlook for each match. Free.

Live mid-market rates, cached 10 minutes to stay fast. Pick a pair and start typing.

Late-payment penalty & interest calculator: contractual daily/annual rate or Russia Art. 395 key rate, period breakdown, partial payments. Free.

Open and extract ZIP, RAR, 7z, TAR and 70+ archive formats online, including password-protected ones. Preview files in your browser. Free.

Drop an image, PDF or a full folder — get editable text, Word, Excel or searchable PDF.

Break any Indonesian word into its root (kata dasar) and affixes — prefix, infix, suffix. Free, in your browser.

See how any letter or word is written in Brazilian school cursive (letra cursiva), play the stroke animation and print a tracing worksheet.

Online music production tools: change pitch & tempo, find BPM & key, EQ, reverb, mix tracks, convert...

Podcast editing toolkit: trim episodes, remove silence, denoise, enhance audio, compress files, conv...

Professional audio tools: spectrum analysis, forensics, watermarking, mixing, mastering, noise reduc...

Video editing tools: trim, crop, compress, add music, create GIFs, manage subtitles. Browser-based e...

Streaming tools: mic test, noise reduction, voice effects, screen recording, live captions. For stre...

Content creation tools: edit audio & video, resize images, generate QR codes, transcribe speech. Onl...

Gaming tools: GPU/CPU benchmark, reaction test, aim trainer, display tests, ping test. Hardware diag...

Study tools: speech-to-text, text formatting, brain training, focus sounds, typing practice. For stu...

Teaching tools: text-to-speech, visual schedules, sign language, live captions, accessibility checke...

Developer tools: DNS lookup, IP info, browser diagnostics, hardware tests, QR codes, accessibility c...

Electronics tools: resistor calculator, Ohm's law, PCB trace, 555 timer, LED, circuit simulator. Onl...

Audio testing tools: speaker test, frequency sweep, sound meter, audio analysis, format conversion....

Accessibility tools: screen reader, color checker, sign language, live captions, dyslexia reader. As...

Health screening tools: cognitive tests, color vision, dyslexia screening, communication boards. For...

Family tools: baby monitor, kitchen converter, budget planner, kids' games, alarm clock. Household t...

Pet tools: dog whistle, pest repellers, cat games, ultrasonic generator. Tools for pet owners.

Privacy tools: VPN checker, browser fingerprint, WebRTC leak test, file encryption, steganography. O...

Wellness tools: white noise, binaural beats, breathing exercises, cognitive training. Relaxation too...

Audiobook tools: ACX mastering, compliance check, noise reduction, voice enhancement, chapter splitt...

Ring size calculator, watch size guide and battery finder. Measure, convert, and find the perfect fi...

Online Islamic tools: prayer times, qibla compass, Hijri calendar, zakat calculator, digital tasbih....

Browser tools for projector owners: throw distance calculator, screen size matcher, focus and color...

Online tools for sport and training: stopwatch with laps, reaction-time test, breathing exercise, co...

Browser tools for time-boxed work: stopwatch, focus timer, kitchen timer, alarms, world clock, count...

Browser tools for photographers: watermark photos in batch, mark up shots, strip GPS, check color, r...

Browser tools for robot makers and owners: quaternion converter, servo and gear calculators, URDF vi...

Browser tools for English learners: IPA transcription, vocabulary profiler, Anki deck builder, shado...

Orthodox Christian tools in your browser: a prayer-rope counter for the Jesus Prayer and a memorial-...

Travel toolkit: offline emergency phrasebook, voice translator, currency converter, flight tracker,...

Guides and tips on audio editing

Learn how to increase the volume of MP3 and other audio files online without dis...

A practical comparison of MP3, WAV, and FLAC audio formats. Learn the difference...

Check if your speakers and headphones work correctly with these 5 free online te...

Learn the difference between LUFS, dBFS, RMS, and peak loudness. Platform standa...

Learn proven techniques to remove background noise from podcasts, voiceovers, an...

Learn essential audio recording tips for beginners. From choosing the right micr...

Learn how to create custom ringtones for iPhone and Android from any song. Free...

Compare AAC, Opus, Vorbis, FLAC, and MP3 audio codecs. Learn the differences bet...

Learn how online hearing tests work, what they measure, how to prepare for accur...

Loops, samples, one-shots, presets, DAWs, VST, MIDI and 808s explained in plain...

Complete guide to starting a podcast: equipment by budget, recording techniques,...

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