Tools for Students
213 toolsTools to boost your study sessions. Transcribe lectures, format text, train your brain with puzzles, generate focus sounds, and practice typing.
Instruments in a song
Upload a track and get the list of instruments plus a map of where each one enters.
Audio Player Online
A player for people who listen closely: it plays the ordinary formats and the ones the browser does not know, reads CUE albums, shapes tone with 31 bands and matches loudness between recordings.
Random Number Generator
Generate random numbers, roll dice, flip coins, pick from lists, create passwords. Crypto-secure, instant, free.
Random Word Generator
Generate random words, letters and ideas for games, writing prompts and brainstorming. Instant and free.
Spectrogram Lab
Analyze sonograms and spectrograms of wildlife sounds: birds, bats, whales, frogs, insects.
Cell Counter
Automatic cell counting and microscopy image analysis — free, in your browser.
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, cheques and batch mode.
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.
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.
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.
Keyboard Layout Converter
Convert between 12 keyboard layouts with auto-detection — QWERTY, Cyrillic, Korean, Arabic and more.
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.
PDF to Word
Convert PDF to a .docx Word file in the browser. Heading detection, page breaks. Editable text.
Word to PDF
Convert .docx to PDF in the browser. A4, Letter, three quality levels, custom margins. No installation.
Image Compression Without Visible Quality Loss
Compress JPG, PNG, WebP and HEIC to a target size. The point where the difference becomes visible is measured per image, not set by a slider.
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 images. Pick DPI, page range and quality. Multi-page output as a ZIP. In the browser.
Protect PDF
Add an AES-256 password and copy/print/edit restrictions to a PDF. Real encryption that every reader from 2017+ understands.
