Free tools for students

An online notepad that keeps markdown notes in folders, links them with [[double brackets]], and autosaves four tenths of a second after you stop typing.

Summarize a long article, an email thread, or a report down to a few sentences. Pick short, medium, or long; the AI model downloads once and then works offline.

Paraphrase text four ways: formal, casual, shorter, or longer, with a small language model that does the rewriting on your own graphics card.

A text cleaner for pasted mess: pull the hard line breaks out of PDF copy, squash double spaces, thin the blank lines, and swap curly quotes for straight ones.

A word counter that also tells you when you have run long. Words, characters, sentences and reading time, plus live checks against the 280, 160, 70 and 60-character caps that cut text off.

A case converter that answers ten ways at once: UPPERCASE, lowercase, Title Case, Smart Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE.

A currency converter built on the European Central Bank's daily reference rates: 30 currencies, cross-rated through the euro, with the publication date printed under every result.

Convert a PDF to an editable Word .docx that keeps its columns, ruled tables, headings and pictures, or switch to Exact layout and pin every line to the coordinates the page gave it.

Convert SRT to VTT and back, retime cues that drift out of sync, and fix the wording in an editable table of every line.

A unit converter with 19 categories, from cm to inches and kg to lbs through pressure, torque and data rate. Pick two units and read the answer as you type.

Morse code translator that runs both ways, on 54 characters of the international table, with a Play button that beeps the result at 15 words per minute.

Convert a .docx to text and keep only the words, with Word's fonts and spacing left behind. Copy the result or save a .txt that keeps the document's name.

Excel to PDF for a workbook someone only needs to read: tick the sheets worth sending, choose A4 or US Letter, portrait or landscape, and each sheet lands as its own page of selectable text.

Markdown to PDF that keeps the text selectable and searchable. A4 pages, an 11pt body, code on a light grey panel, links still clickable.

Number base converter for binary, octal, decimal and hex, reading input written in any base from 2 to 36. BigInt math, so a 128-bit value converts exactly.

Word to PDF without opening Office. Give it a .docx and you get back an A4 document with selectable text and links that still click.

An online scientific calculator you write expressions into instead of tapping key by key: trig in degrees or radians, logs, powers, factorials, and exact answers like 2/3 + 3/4 = 1 5/12.

A date calculator for questions like what date is 90 days from today. Add or subtract days, weeks, months or years, and get the weekday with the answer.

A calorie calculator built on Mifflin–St Jeor: your maintenance number, the BMR under it, and loss or gain targets at 250 and 500 kcal, plus a date if you name a goal weight.

An age calculator that counts whole calendar months, so it answers 34 years, 2 months, 5 days, then repeats the same span in months, weeks and days.

A grade calculator with four switchable modes: GPA on the 4.0 scale, CGPA to percentage, a weighted class grade, and what you still need on the final.

A bill splitter for one check or a whole trip: tip, tax, who paid what, and the shortest list of transfers that squares everyone up.

A BMI calculator that puts your reading on a 15-to-40 scale beside the WHO cut-offs, then works backwards to the weights that count as healthy at your height.

Days between two dates, with the same span given in weeks, in years and months, and in business days once your own holidays come out.

A percentage calculator that answers four questions on one page: X% of a number, X as a percent of Y, the increase or decrease between two figures, and what a price drops to after a discount.

AI image upscaler that enlarges a photo 2× or 4×, or works back from the exact print size you type in. Rebuilds detail instead of stretching pixels.

Extract text from an image or a scanned PDF, using a neural engine that reads 50 scripts and copes with a page shot at an angle.

Scan paper with a phone camera and get back a straight, readable multi-page PDF: auto edge detection, per-page looks, a stain eraser, optional searchable text.

Chat with a PDF in ordinary words. Answers cite the page and show a snapshot of the passage they came from.

Crop a PDF by dragging a box or typing margins in millimetres. Fit to content finds the ink, sideways pages are cut on the right edge, and any page can keep its own box.

Extract text from a PDF the moment it lands, copy it or save a .txt named after the file, and see which pages are scans with no text to give.

Rotate PDF pages 90° or 180° and download a file that opens the right way up in every reader. Turn all of them or just a few.

A vocal remover that splits a song into two stereo tracks, the voice on one and the instrumental on the other, using Deezer's Spleeter model.

An audio visualizer that splits whatever's playing into 1,024 frequency bands and draws each one as a bar, updated every frame.

A voice recorder with a real pause: hold the take, breathe, carry on into the same file. Live input meter, a mic picker when you have more than one, and M4A, WAV, Opus or FLAC out.

A tone generator that sounds the moment you press Play: type or slide to any frequency, sweep 20 Hz to 20 kHz, or play white, pink and brown noise.

Audio transcription with Whisper. Drop in a recording and get editable text, plus SRT and WebVTT carrying timestamps, from any of four model sizes.

Text to speech two ways: the voices your device already has, or a 13-voice English model that hands you a file.

Remove background noise from audio with DeepFilterNet, a speech model that runs on your device. Hum, fans and hiss drop away, the voice stays, and the clean take saves as M4A, WAV, Opus or FLAC.

Change audio speed anywhere from 0.5x to 2x: drop a track to 0.75x for a slowed edit, or lift it to 1.5x for nightcore. Pitch follows the speed. Exports as M4A, WAV, Opus or FLAC.

BPM counter with two ways to get an answer: analyze an audio file, or tap the beat out yourself. File detection always lands between 90 and 180 BPM.

Reverse audio end to end and hear it play backwards, then save the flipped clip as M4A, Opus, WAV, or FLAC. Sample rate and pitch stay exactly where they were.

Compare two Excel or Google Sheets ranges by pasting them side by side. Changed cells light up, added rows go green, removed rows red.

Markdown to HTML with the rendered page beside the source. Pipe tables, 36 highlighted languages, Mermaid diagrams, and a markdown.html download.

A text and code diff checker that goes down to the word: edited lines show only the parts that actually changed, and the comparison exports as a unified .diff.

Countdown to any date. How many days until a birthday, a holiday or a deadline, counted down to the second.

Countdown timer with quick presets and an alarm that keeps beeping until you stop it. Set anything up to 99:59:59 and the tab title tracks the time left.

A pomodoro timer with a task list. Twenty-five minutes of focus, five off, a long break every fourth round, and every finished session counted against what you're working on.

An online alarm clock for any time you type, or one of eight common wake-ups: four sounds, a five-minute snooze, a fullscreen bedside face, and it survives a refresh.

An online stopwatch that counts in hundredths, records laps into a Lap/Split/Total table, exports them as CSV, and runs from the Space and L keys.

A time duration calculator for the gap between two clock times. Enter start and end, take off an unpaid break, and read it as 8h 0m, 8.00 decimal hours, or 480 minutes.

The ISO 8601 week number for today or any date you pick, with the day of the year, the weeks left in it, and that week's Monday and Sunday.

A vocal remover that splits a song into two stereo tracks, the voice on one and the instrumental on the other, using Deezer's Spleeter model.

Audio transcription with Whisper. Drop in a recording and get editable text, plus SRT and WebVTT carrying timestamps, from any of four model sizes.

Summarize a long article, an email thread, or a report down to a few sentences. Pick short, medium, or long; the AI model downloads once and then works offline.

Paraphrase text four ways: formal, casual, shorter, or longer, with a small language model that does the rewriting on your own graphics card.

Text to speech two ways: the voices your device already has, or a 13-voice English model that hands you a file.

Remove background noise from audio with DeepFilterNet, a speech model that runs on your device. Hum, fans and hiss drop away, the voice stays, and the clean take saves as M4A, WAV, Opus or FLAC.

AI image upscaler that enlarges a photo 2× or 4×, or works back from the exact print size you type in. Rebuilds detail instead of stretching pixels.

Extract text from an image or a scanned PDF, using a neural engine that reads 50 scripts and copes with a page shot at an angle.

Chat with a PDF in ordinary words. Answers cite the page and show a snapshot of the passage they came from.