For Teachers: Lesson Prep, PDFs and Classroom Aids
139 toolsTools for preparing lessons and running a class: handouts from PDFs, English and language teaching, marking written work, text-to-speech and captions, and support for learners with additional needs.
Education
Step-by-step equation solving
Solve equations, inequalities and systems step by step: discriminant, Vieta, domain, sign chart and a substitution check. Works from a photo.
Function graphing calculator
Graph any function and get its zeros, extrema, asymptotes and intersections as numbers. Sliders for parameters, table of values, PNG and link.
Mind map
Build a mind map from the keyboard, or paste a list and get a map. Share it as a link with no account; export PNG, PDF, Markdown, OPML.
Printable Puzzle Maker
Sudoku at 4×4, 6×6 and 9×9 with one verified solution and honest difficulty, plus word searches from your own list. Four to a page, PDF with answers.
Schulte Tables
Find the numbers in order without moving your eyes from the center. A series of five grids gives you work efficiency, warm-up and stability.
Speed Reading Trainer
Read one word at a time with an eye anchor, in chunks or by sentence — and measure how many words per minute you actually read.
AI presentation maker for lessons
AI builds a lesson presentation from your topic: slides, lesson plan, handout and a narrated video. PowerPoint export with speaker notes.
World Alphabets
Interactive alphabet guide for 12 languages. Click any letter to hear its pronunciation. Learn mode + quiz mode.
EGE Score Calculator
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.
Algebra test
Adaptive algebra diagnostic for grades 5–11: shows which topics are mastered, where the gaps are, and what to study first.
Graph paper
Grid, millimeter, dots, isometric, staves and handwriting guides as PDF with exact millimeters and a printer calibration.
Typing Trainer
Free typing trainer with adaptive lessons, code mode, finger heatmap and certificate. QWERTY, Dvorak, Colemak. 10 languages.
Periodic table
The periodic system, the solubility chart, the activity series of metals and a molar mass calculator on one page, with data from PubChem.
Animal Vision Simulator
Pick an animal and a source, then drag the slider to compare your vision with theirs.
True Size of Countries
Drag any country across the map and see its real size: Mercator stops inflating it. Compare countries, states and regions by true area.
Blank Maps to Fill In
Fill in a blank outline map on a phone or computer and print it
Logic Games for Kids
Free adaptive logic puzzles for kids 5–12: patterns, odd-one-out, analogies, shapes, and deduction. Voice narration and a parent skill report.
Roman Numerals
Type either box to convert. Switch modes for dates, a Roman clock, lessons, or a quiz. The chart stays visible.
Number to Words
Spell numbers and amounts with real grammar — seven languages, currency, ordinals, checks and batch mode.
School Bell
Rings on its own on schedule — with a bell or a melody — and shows on screen how much time is left in the class.
Math Practice for Kids
Pick a level, fill in the answers, and tap Check. Earn coins, open chests, and unlock new worlds.
Multiplication Table Trainer
Interactive multiplication chart, a times tables trainer that asks the hard facts more often, a mastery map and printable worksheets. In the browser.
Column Arithmetic: Four Operations Step by Step
Long division, multiplication, addition and subtraction step by step on grid paper: carries, remainders, repeating decimals. In your browser.
Fraction Calculator
Add, subtract, multiply and divide fractions with steps: LCD, simplifying, mixed numbers, repeating decimals, GCF and LCM. In your browser.
Chemistry Calculator
Balance chemical equations with the oxidation-number method, find molar mass and percent composition, solve stoichiometry. In the browser.
Number systems with the working
Convert binary, octal, decimal and hex with full working: division ladder, expanded form, bit groups. Two's complement, IEEE 754. In the browser.
Truth tables and Boolean expressions
Truth table with a column for every step, DNF and CNF, Quine–McCluskey minimization, a Karnaugh map and a logic gate diagram. In the browser.
Geometry with a drawing
Triangles, quadrilaterals, circles, polygons and solids from any given data: scale drawing, every value, working with named theorems. In the browser.
Calculus solver
Step-by-step derivatives, integrals and limits: each step names its rule and every answer is checked numerically. Runs in the browser.
Class Timetable Builder
Make a class schedule in two minutes: color-coded subjects, bell times, A/B weeks, 10 designs, vector PDF and a phone wallpaper. In your browser.
English language
8 more in this category →IELTS Writing Checker
IELTS Writing band score for Task 2 essays, Task 1 charts and letters: four criteria with quotes from your text, fixes and a Band 9 version. Online.
Text to IPA
Turn English text into IPA phonetic transcription: context-aware readings, weak forms, stress and syllables, British and American.
Syllable Counter
Count the syllables in any English word or text. Dictionary-accurate, with a poetry mode for haiku. Free, in your browser.
Sentence stress
Shows the main stress of each phrase, its thought groups and weak forms. Move the stress to any word, or record yourself and compare the rhythm.
Word Stress
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.
Minimal Pairs
Train your ear on tricky English sounds — ship vs sheep, light vs right. A minimal pairs listening drill, in your browser.
Subtitle vocabulary
Drop in an .srt and see how much of the dialogue you would follow, and which words to learn before you press play.
Anki Deck Builder
Paste a word list and build a real Anki .apkg deck — with IPA, audio and a built-in study mode. Free, in your browser.
My English Word List
Type a word — level, transcription and pronunciation fill themselves in. The card returns the day you start forgetting it, scheduled by FSRS.
English Dictation Practice
Listen to graded English sentences and type what you hear. Word-by-word error highlighting, A1–C2 levels, adjustable speed. Free, in the browser.
English Spelling Test
Hear an English word and spell it. Four difficulty tiers, example sentences, letter-by-letter error marking and a streak counter. Free.
English Vowel Trainer
Hold the vowel like a long, steady note — don't say the consonants around it. Record somewhere quiet for the clearest reading.
English Level Test
Adaptive English level test: vocabulary, grammar, reading and listening. Get your CEFR level with IELTS and TOEFL equivalents. Online, no signup.
English Grammar Course
Learn English grammar by CEFR level A1–C2. Free course with clear lessons, exercises and progress tracking, in your browser.
Word of the Day
A new English word each day with translation, meaning, examples and audio. Save and review words with spaced repetition. Free, in your browser.
English Level Converter
Convert any English score between CEFR, IELTS, TOEFL, Cambridge and Duolingo, and calculate your IELTS overall band. Free, in the browser.
Gap-Fill Generator
Turn any text into a fill-in-the-blanks exercise. Choose how words are removed, do it on screen or print a worksheet with an answer key. Free.
PDF Tools
13 more in this category →DjVu to PDF
Converts DjVu to PDF in your browser: letters stay sharp, the text is searchable, bookmarks, links and page numbers carry over.
Extract PDF Pages
Pull selected pages from a PDF into a single new file. Pick by number, by range, or by clicking thumbnails. Bookmarks survive.
Remove Pages from PDF
Delete unwanted pages from a PDF. Click thumbnails or type a range. Blank-page sweep included. No size cap.
Rotate PDF
Rotate PDF pages 90, 180 or 270 degrees per page or all at once. Preserves bookmarks and page labels. In the browser.
Crop PDF
Trim white borders from a PDF. Auto-detect ink, set margins in mm/in/pt, preview live. Vector output, in the browser.
JPG to PDF
Convert JPG, PNG, WebP, AVIF or HEIC images to one PDF. Drag to reorder, rotate, set page size + margins.
PDF to JPG
Convert PDF pages to JPG, PNG or WebP: one image per page or all pages in one long image. Pick DPI and pages. In the browser.
Word to JPG and PNG
Word to JPG and PNG converter: every .docx page becomes a separate image. Up to 300 DPI, pick the pages you need. Runs in your browser.
Word to PDF
Convert .docx to PDF in the browser. A4, Letter, three quality levels, custom margins. No installation.
Merge PDF
Combine multiple PDFs into one file. Reorder pages, pick page ranges per file, rotate, add bookmarks. Fast, in your browser.
PDF Compression
Shrinks a PDF while keeping text, fonts and bookmarks — only the images get recompressed. Includes a fit-under-a-size mode. Runs in your browser.
Split PDF
Split a PDF by pages, ranges, every N pages, or bookmarks. Preserves outlines and page labels.
Print documents online
Print PDF, Word files and photos from a computer or phone: pages per sheet, a poster across several sheets, booklets, two-sided printing.
PDF Editor
PDF editor online: change the text already in the document, sign it, fill a form, white out what should go, reorder pages. All in one pass.
Accessibility
12 more in this category →Visual Schedule
Visual daily schedule with icons, timers, and transition alerts for autism and ADHD.
Communication Board
AAC symbol board with text-to-speech for nonverbal communication.
Sign Language Dictionary
Search and learn sign language visually.
Fingerspelling Practice
Practice fingerspelling in 8 sign languages with interactive quizzes and hand shape diagrams.
Speech Pacer
Visual metronome for speech pacing with breathing coordination and recording.
Dyslexia Reader
Customizable reading aid with dyslexia fonts, spacing, focus cues, overlays and text-to-speech.
Reading Ruler
Visual reading ruler and color overlay to help with dyslexia and visual stress.
Live Captions
Free live captions in your browser. See speech as text in real time.
Camera Text Reader
Point your camera at text or upload a photo — the tool recognizes it and reads it aloud.
Online Magnifier
Point your camera, open a photo or a PDF, and zoom into any spot up to 40×.
Russian language
1 more in this category →Russian–Latin Transliterator
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.
Russian Stress Marks
Automatically place stress marks on Russian text, pick the variant for homographs, and restore the letter ё.
Declension by Case
Enter a noun and get it in all six cases, singular and plural, with stress marks and audio.
Russian name declension
Enter a Russian full name — the tool declines it through all six cases with the correct gender, tells you whether the surname declines at all, and builds the patronymic from a given name.
Yoficator
Automatically restore the letter ё in Russian text: clear cases instantly, ambiguous ones are yours to choose.
Russian Vocabulary Test
An adaptive test estimates how many Russian words you know from your "know / don't know" answers.
Russian cursive
See how any Russian letter or word is written in cursive, play the writing animation and print a tracing worksheet.
Russian Word Analysis
Phonetic, morphemic and grammatical analysis of any Russian word form: sounds and letters, transcription, stress, parts of speech. In the browser.
Space & nature
12 more in this category →Earthquake simulator
See how hard a given magnitude shakes your city: intensity contours on a real map, a synthetic seismogram and building response. Runs in the browser.
Beaufort scale
Wind force in numbers: the full Beaufort table, the Saffir-Simpson categories, and what wind a hurricane would deliver to your city.
Solar System
Interactive Solar System model: planets in their real positions now, today’s distance to Mars, planetary alignments and your weight on each planet.
3D Earth Globe
Interactive 3D Earth globe with real-time day & night, sun position, country search and live ISS tracking. Free, in your browser.
Moon
Moon phase now, lunar day counted from moonrise at your location, rise and set, distance and a phase calendar. 3D globe with real libration.
Eclipses
Upcoming solar and lunar eclipses: path of totality on a map, start and maximum times for your city, how much of the Sun is covered and its altitude.
Measure on map
Trace a plot on the map and get its area on the WGS84 ellipsoid — in hectares or acres — not the area of the picture on screen.
Text Tools
Handwriting from typed text
Turns typed text into a page written by hand: handwriting styles, ruled paper, transparent PNG and PDF. Also writes by hand into an existing PDF form.
Punctuation & Spell Checker
Check Russian and English punctuation, commas, dashes and spelling — with rule explanations and one-click fix. Russian has an advanced in-browser spell-checker.
Word Counter
Count words, characters, sentences, paragraphs. Readability scores, keyword density, social media limits. Free, runs in your browser.
Poetry Analyzer
Analyze poems: detect meter (iambic, trochaic, dactylic), rhyme scheme, syllable count and spellcheck. For students and writers. Free.
Teleprompter
Teleprompter that paces by words, follows your voice through the whole script, and records the take on camera.
Creative
9 more in this category →Country flags
An online tool for the flags of the world: filter by color, check the proportion and color codes, download PNG or SVG — or set the cloth waving in the wind.
Wall Newspaper
Build a printable wall newspaper for school holidays, classroom corners or birthdays — drop in photos, text and stickers, then print across A4 sheets.
Online Whiteboard
A board per student, no sign-up; LaTeX formulas and graphs, chalkboard and grid, PDF pages, stylus pressure. Send a link — the lesson starts.
Collaborative book
Write a book together: start a story or add a page to someone else's. Append-only — nobody can delete your page, editable for 24h.
Color Mixer
Mix colors like paint or light and get a recipe from your own paints, from a photo: proportions, white balance, batch check.
Sports & Refereeing
3 more in this category →Whistle
A referee whistle with sound: the blast lasts while you hold, signals labeled for your sport, intervals and a WAV download.
Electronic Scoreboard
Score, clock, shot clock, timeouts, fouls and penalties in big digits across the whole screen. The board already knows the rules of twelve sports.
Beep Test and Cooper Test
Audio cues for the 20 m beep test, 15 m PACER and Léger test, a Cooper test timer, tap-to-mark misses, and a class report with VO2max.
Race Timer
Start on a signal, finish by lane or from a mass start: places, gaps, grades and a results sheet — instead of a handful of stopwatches.
Tournament Bracket
Seeded playoffs, round robin with a crosstable, groups that feed a playoff, a draw with a code, schedule and print.
Video
Eye Contact
Fix eye contact in a video: your eyes look into the lens, not at the script on the screen. Lids and highlights move with the iris; audio stays as is.
Subtitles & Transcript
Turns speech in a video into subtitles (SRT/VTT), a copyable transcript, and an MP4 with captions.
Subtitle Editor
Text, timing and quality checks for subtitles, in the browser.
Slideshow Maker
Combine photos and video clips with music — transitions, Ken Burns motion, export to MP4 up to 4K, slides or PDF.
Documents
Document translation that keeps the layout
PDF, Word, Excel, PowerPoint and EPUB translated with the layout intact: tables, columns and slides stay put. Scans are read, edits before download.
Certificates and diplomas
Build an award document and print it — one, or a whole class at once.
Word Processor
A document editor in your browser: opens and saves DOCX, exports PDF with real text, letter and report templates, APA and MLA formatting.
OCR Text Extractor
Drop an image, PDF or a full folder — get editable text, Word, Excel or searchable PDF.
Diagrams and charts
Chart Maker
Bar, pie, line and scatter charts from an Excel range or a word problem, with the math worked out for homework
Flowchart
Flowchart editor: Mermaid text and mouse in one window, diagrams from a description or from code. Block nudges stay put. PNG, SVG, PDF.
Map Chart Maker
Color countries and regions by group or by the numbers in a table — with a legend and labels
Timeline Maker
Make a timeline on a true time scale: BC dates, centuries, periods and categories. Export to PNG, PDF and PowerPoint. In the browser.
Handy Tools
Experts
Book online sessions with specialists: times shown in your time zone, meet by video, chat or in person. A specialist? Create your own booking page.
Stencil maker
Type a word or pick a shape — the bridges place themselves.
Labels & stickers
Build your own sheet of labels and print it so the ink lands inside the die cuts.
Analysis
Musical Ear Trainer
Ear training on piano sounds: intervals, major or minor, chords and a perfect pitch test. Rounds of 10 questions with a review of your mistakes.
Orchestration check
Reads a MusicXML or MIDI score and shows what the orchestra cannot play: notes out of range, no room to breathe, impossible harp chords.
Sheet Music to MIDI
Scan any score photo or PDF and hear the notes back.
Clocks & Time
Visual Timer
A timer where the remaining time is a shape, not a number.
Hourglass Timer
Set a duration and watch the sand run through the glass.
Julian ↔ Gregorian
Convert dates between Julian (old style) and Gregorian (new style) calendars. Automatic shift per era, Orthodox feasts, Easter dates. Free.
Voice & Speech
Text to Speech
Convert text to natural speech with neural AI voices in 30+ languages. Download as MP3.
Speech to Text
Speak into your microphone and watch text appear in real time. Voice commands, auto-punctuation, 34 languages.
Audio to Text
Upload a recording and get the text in paragraphs, with speaker labels and timecodes. Edit on the page, download DOCX, PDF or subtitles.
Games
Musical instruments
Calls & sharing
Measuring
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.
Health
Other tools
GPA Calculator
Add each course with its letter grade and credit hours to get your credit-weighted GPA.
Spin the Wheel
Add your entries, then spin the wheel to pick a random winner.
Career Test for Teens
Free RIASEC career test for teenagers. Discover careers that fit your interests, with real pay, job growth and AI outlook for each match. Free.
Verb Conjugator
Conjugate verbs in English, Spanish, French, German, Portuguese, Italian, Russian and Ukrainian: every tense, irregular forms marked. In the browser.