Most "free online tools" ask you to upload your file to their server first. Your résumé PDF, your voice memo, your contract — sitting on someone else's machine while a spinner says processing.
I got tired of that, so I built Toolfyra — a suite of 385 free tools (PDF, audio, image, text, developer utilities) where every operation runs inside your own browser. Nothing is uploaded, nothing is stored, there is no account and no watermark. Close the tab and the data is gone, because it never left.
What's inside
- Audio: trimmer, vocal remover, volume booster, ringtone maker, metronome — all via the Web Audio API, decoded and rendered locally (audio trimmer)
- Developer: a REST API tester that fires real requests from your tab (rest-api-tester), DNS lookup over DoH, fake JSON generator, markdown-to-HTML
- Text & privacy: AI-text humanizer, summarizer, IBAN validator, password breach checker that uses k-anonymity (only the first 5 chars of a SHA-1 hash ever leave your browser)
Three things I learned building it
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The browser is far more capable than users believe.
ffmpeg.wasm, Web Audio,crypto.subtleand Canvas cover 90% of what people upload to server tools for. - Privacy is a feature, not a footer link. The moment a tool says "your file never leaves your device", conversion and trust go up. It's the #1 question in every support email.
- Depth beats breadth for search. We publish one book-length, measured guide per tool (100+ so far). For our pomodoro guide we measured the top ranking competitors: median content length was 392 words. Real substance still wins.
Try it / audit it
Browse all 385 tools: https://toolfyra.com
Full sitemap (1,783 pages): https://toolfyra.com/sitemap.xml
Full disclosure: I'm the builder. Everything is free, no signup — feedback welcome, I read every comment.
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