Tools for Developers & IT Pros
100 toolsNetwork diagnostics, browser testing, and hardware validation tools. DNS lookup, IP analysis, system diagnostics, display calibration, and accessibility checking.
One-Time Secret Share
Share a secret via an encrypted link. AES-GCM 256-bit, decryption key lives in the URL fragment. No account, no database.
PGP Key Generator
Generate PGP / OpenPGP keys (RSA, Curve25519) in your browser. Encrypt, decrypt, sign and verify. Works with GnuPG, Thunderbird, ProtonMail.
Sign PDF
Add your signature to a PDF online: draw, type or upload it, drop it on the page, add the date and download the signed file. In your browser.
Verify PDF
Check whether a signed PDF has been altered. Upload the PDF and its verification seal to confirm the file is unchanged. In your browser. Free.
Text Formatter
All-in-one text formatter: 60+ operations for case conversion, cleaning, encoding, fancy text. Free, private, in browser.
Color Accessibility Checker
Pick two colors to check contrast ratio and colorblind visibility.
Colorblind Simulator
Upload an image to compare original and colorblind views side by side.
Keyboard Layout Converter
Convert between 12 keyboard layouts with auto-detection — QWERTY, Cyrillic, Korean, Arabic and more.
Typing Trainer
Free typing trainer with adaptive lessons, code mode, finger heatmap and certificate. QWERTY, Dvorak, Colemak. 9 languages.
OCR Text Extractor
Drop an image, PDF or a full folder — get editable text, Word, Excel or searchable PDF.
Online Protractor
Online protractor with transparent overlay and photo measurement — mm calibration, multi-angle, PNG/PDF/JSON export. Handy for builders, carpenters and students.
Online Ruler
Free online ruler in actual size. Calibrate to your screen and measure in cm, mm and inches — on screen or on a photo.
Archive Extractor
Open and extract ZIP, RAR, 7z, TAR and 70+ archive formats online, including password-protected ones. Preview files in your browser.
BIN/CUE to ISO
Convert BIN/CUE to ISO online. Auto-detects MODE1/2 sector layouts, extracts CD-DA audio as WAV, parses multi-track cuesheets. Free.
Quaternion & Rotation Converter
Select an input format, enter values, and all other representations update live.
URDF Viewer
Visualise robot links, joints and meshes — articulate the kinematic chain live
Forward Kinematics Visualizer
Visualize serial robot arm kinematics interactively using Denavit–Hartenberg parameters.
Serial Monitor
Connect Arduino, ESP32, or any serial device and monitor incoming data live in your browser.
Emoji catalog
Browse 1 940 Unicode emojis with names in 9 languages. Search by paste, hex or :shortcode, copy in one click, download SVG/PNG. Free.
Sample Video Generator
Download or generate sample video for player testing — 1080p / 4K H.264 MP4 catalogue plus on-the-fly WebM and MP4 via MediaRecorder.
Sample Audio Generator
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.
Dummy File Generator
Generate dummy files of any size from 1 KB to 10 GB. Zero, random, text or pattern bytes, custom extension, instant browser download.
Test Image Generator
Generate test images for QA — colour bars, grayscale, gradient, checker, grid up to 4K. Export as PNG, JPEG or WebP with adjustable quality.
Test PDF Generator
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.
