Students
Turn lecture PDFs and slides into flashcards, study with a memory model that knows what you'll forget, check maths step by step and build a bibliography in any citation style.
10 studios · 60+ tools · 0 uploads
Serious tools for your files & studies. Nothing leaves your device.
Edit PDFs, write Word documents, fix Excel spreadsheets, clean CSV data, grade photos, build slides, study with smart flashcards, cite sources and solve maths — free, private and right in your browser. No sign-up. No watermarks. Works offline.
Drop any file herePDF, Word, Excel, CSV, PowerPoint, photos or Anki decks: the right studio opens with it. Nothing is uploaded.
- Files stay on your device
- Works offline
- 107 languages
PDFDOCXXLSXCSVPPTXJPGPNGWEBPAVIFAPKGJSONYAMLXMLSQLMDTXTSVGTSVRTFHTMLPDFDOCXXLSXCSVPPTXJPGPNGWEBPAVIFAPKGJSONYAMLXMLSQLMDTXTSVGTSVRTFHTML
10full studios
60+quick tools
107languages
0files uploaded
$0to use every studio
The studios
Ten complete workspaces. One quiet browser tab.
Each studio is a full application — the kind you'd normally pay a monthly subscription for — built to open real files, keep your work safe with autosave, and export to the formats everyone else uses.
Study Studio
Flashcards that remember what you'll forget.
A free alternative to Quizlet and Anki with the FSRS memory model, eight study modes and a planner that predicts your recall on exam day. Turn a PDF, Word file, slides or a photo of your notes into flashcards in seconds, in any of 107 languages.
APKG · CSV · PDF · DOCX · PPTX
PDF Studio
Every PDF job in one private workspace.
Read, annotate, sign, redact, merge, split, compress and convert PDFs without uploading them anywhere. Make scans searchable with OCR, protect files with a password and keep five documents open at once.
PDF · PNG · JPG · DOCX · XLSX
Document Studio
Write, format and export real Word files.
DOCX · MD · HTML · TXT
Excel Studio
Spreadsheets with working formulas, in your browser.
XLSX · XLS · CSV · PDF
CSV Studio
Clean, reshape and chart data files of any size.
CSV · TSV · XLSX · JSON · PDF
Presentation Studio
Build, present and export slide decks.
PPTX · PPSX · PDF · PNG · VIDEO
Image Studio
A digital darkroom that never uploads your photos.
JPG · PNG · WEBP · AVIF · GIF
Citation Studio
Reference lists in APA, MLA, Chicago, Harvard, IEEE and 13 more styles.
DOCX · RTF · BibTeX · RIS · CSL-JSON
Math Studio
Answers with every step shown.
STEPS · GRAPHS · LATEX
Invoice Studio
Professional invoices and quotes in minutes.
PDF · CSV
Resume Studio Coming soon
A CV that gets read, in any language.
Contract Studio Coming soon
Draft, fill and sign simple agreements.
How it works
Open. Work. Export. That's the whole process.
- 01
Open any file
Drop a PDF, Word document, spreadsheet, image, slide deck or data file into a studio. It opens instantly because nothing is uploaded — your browser reads it directly.
- 02
Do the real work
Edit, annotate, calculate, clean, grade, study or cite with professional tools. Your work autosaves in your browser, with undo when you need it.
- 03
Take it anywhere
Export to PDF, DOCX, XLSX, PPTX, CSV, PNG and more, or install Cromagnon as an app and keep working offline. Sign in only if you want sync between devices.
Privacy by design
Your contract, your payslip, your class notes — never on our servers.
Most online tools ask you to upload a file to their computers, process it there and send it back. Cromagnon works the other way round: the software comes to your browser, and your files stay on your device. That makes it faster, safer for sensitive documents, and usable on a plane.
- Processing happens on your device
- No account needed for any studio
- No ads or trackers inside the tools
- Sync is optional, and only what you choose
Since about 40,000 BC
Made by humans, for humans.
The first people painted hands on cave walls, counted on bones and shaped stone into tools. The work hasn't changed much: we still write, count, draw and share. Cromagnon just makes the tools free, private and quick, for everyone, everywhere.
Made for how you work
One toolkit, five very different days.
Teachers
Share decks with a class code and see who has studied, build slide decks, write worksheets as real Word files and turn any handout into a practice quiz.
Office & business
Sign and redact contracts, fix spreadsheets with working formulas, clean customer exports and merge PDFs, without sending company files to someone else's server.
Developers
Format JSON, decode JWTs, test regular expressions and generate hashes with tools that make no network requests, so pasting a token or a customer record is safe.
Creators & sellers
Colour-grade product photos, compress images for the web, convert to WEBP or AVIF and export slides as images or video, all in the browser tab you already have open.
Why switch
Everything the subscriptions do. Without the subscriptions.
CromagnonTypical paid tools
PriceFree$10–$25 a month each
Your files are uploaded
Account required
Works offline
PDF, Word, Excel, slides, images, flashcards in one place
107 languages, right-to-left scriptsSome
Watermarks or daily limitsOften
Ads and trackers in the toolOften
For everyone, everywhere
107 languages. Every script.
Cromagnon is built for people in every country. Study Studio reads scanned pages, speaks and listens in 107 languages; text flows right-to-left for Arabic, Hebrew, Persian and Urdu; answer checking understands accents, vowel marks and full-width letters; and language names appear in your own language.
Quick tools
Small jobs, done in seconds.
DeveloperJSON Formatter & ValidatorValidate, format, and minify JSON safely in your browser.TextWord & Character CounterCount words, characters, sentences, paragraphs, and reading time.GenerateQR Code GeneratorCreate downloadable QR codes for text and URLs locally.GeneratePassword GeneratorCreate strong, random passwords with custom rules.TextText Diff CheckerCompare two texts and highlight added and removed lines.ConvertCSV to JSONConvert spreadsheet rows into structured JSON.CleanDuplicate removerFind and remove identical spreadsheet rows.DeveloperRegex TesterTest regular expressions with live matches and capture groups.DeveloperJWT DecoderDecode a JSON Web Token to inspect its header and payload.TextText Case ConverterSwitch text between UPPER, lower, Title, camelCase, snake_case and more.GenerateUnit ConverterConvert length, weight, temperature, data, and time units.TextMarkdown PreviewWrite Markdown and preview the rendered HTML live.
Latest updates
Still sharpening the flint.
A new look, from the first toolmakers
- Cromagnon has a new look inspired by the first toolmakers: parchment pages, cave-dark headers, bone and red ochre, and old-book headings.
- The studios page opens with a catalogue of every studio, each with its own museum-object picture, followed by a full write-up of each one.
- The pricing page now explains why everything is free, compares Cromagnon with typical online tools and paid suites, and answers more questions.
- Select people parts with on-device AI: face skin, body skin, hair, eyebrows, eye whites, iris, lips, teeth and clothes — for everyone in the photo, even in groups.
- Landscape selections: sky, water, architecture, vegetation, mountains, natural ground and artificial ground, in any combination.
- Mask presets such as Whiten teeth, Brighten eyes, Smooth skin, Deepen sky and Lush vegetation, and save your own.
- Finished mail merge: upload a CSV or Excel list, insert fields, address blocks and greeting lines, add IF rules, preview every letter, check for errors, then download one merged Word file or PDF, a file per person, or label sheets in Avery sizes.
- 59 designed templates with a searchable gallery: letters, CVs, reports, minutes, invoices, certificates and more.
- Small everyday Word features: bigger / smaller text buttons, list and bullet styles, paragraph borders and shading, page-number formats, date formats and document properties.
Install it like an app. Use it without internet.
Add Cromagnon to your phone's home screen or your computer's taskbar straight from the browser — no app store, no download. Studios you've opened keep working offline, and your changes sync when you're back online.
Questions
Good questions, straight answers.
Is Cromagnon really free?
Yes. Every studio and tool on this site is free to use, with no watermarks and no daily limits. A free account adds sync and 50 MB of cloud files. If a paid plan ever comes, it will only be for extras that cost money to run — what is free today stays free.
Are my files uploaded to a server?
No. Files are opened and processed inside your browser, on your own device. Their contents are never uploaded unless you choose to sync your decks, publish a deck to the library or share with a class. For security, only file names, sizes and types are logged.
Do I need an account?
No. Everything works without signing up, and your work autosaves in your browser. A free account adds sync between devices, the public deck library and classes.
Does it work offline?
Yes. Install Cromagnon as an app from your browser, and the studios you've opened keep working with no internet connection. Changes sync when you're back online.
Can I edit a PDF for free?
Yes. PDF Studio lets you annotate, highlight, add text and images, sign, redact, merge, split, reorder, compress, fill forms, protect with a password and make scans searchable with OCR.
Is there a free alternative to Quizlet and Anki?
Study Studio is free, imports your Anki and Quizlet decks, uses the FSRS memory model that modern Anki uses, has eight study modes and works offline on your phone.
Which languages are supported?
Study Studio reads scans, speaks and listens in 107 languages, and every studio handles right-to-left scripts such as Arabic, Hebrew, Persian and Urdu.
Can I open Word, Excel and PowerPoint files without Microsoft Office?
Yes. Document Studio opens and saves real DOCX files, Excel Studio edits XLSX workbooks with working formulas, and Presentation Studio opens and exports PPTX decks.
More in the full FAQ.
Stop uploading your life to get simple things done.
Pick a studio and start — no account, no download, no cost.