For two years I kept a private list of browser utilities that respected two rules: no signup walls, and no file ever leaves my machine. The list grew into a whole site — 4,200+ pages, every tool client-side — and people kept asking for "the index." This post is the index.
The rule that matters
"Free online tools" usually means "upload your file to our server, get throttled, get ads." The opposite architecture exists now: WebAssembly runs real engines — ffmpeg for video, PDF libraries for documents, crypto stacks for hashing — inside your browser tab. When conversion happens on-device, privacy isn't a policy page; it's a property you can verify in the Network tab. Everything below follows that design.
Documents & PDF — https://toolfyra.com/pdf-merger.html · https://toolfyra.com/pdf-splitter.html · https://toolfyra.com/word-to-pdf.html · https://toolfyra.com/pdf-compressor.html · https://toolfyra.com/epub-to-pdf.html
Images — https://toolfyra.com/image-compressor.html · https://toolfyra.com/image-resizer.html · https://toolfyra.com/png-to-jpg.html · https://toolfyra.com/webp-converter.html · https://toolfyra.com/qr-code-generator.html
Video & audio (on-device ffmpeg) — https://toolfyra.com/video-compressor.html · https://toolfyra.com/video-converter.html · https://toolfyra.com/video-trimmer.html · https://toolfyra.com/video-merger.html · https://toolfyra.com/audio-converter.html · https://toolfyra.com/video-to-audio.html · https://toolfyra.com/video-subtitle-generator.html
YouTube & social — https://toolfyra.com/youtube-to-mp3.html · https://toolfyra.com/youtube-to-mp4.html · https://toolfyra.com/youtube-playlist-downloader.html · https://toolfyra.com/youtube-video-summarizer.html · https://toolfyra.com/spotify-downloader.html · https://toolfyra.com/tiktok-to-mp3.html · https://toolfyra.com/instagram-reels-downloader.html
Text & writing — https://toolfyra.com/word-counter.html · https://toolfyra.com/character-counter.html · https://toolfyra.com/case-converter.html · https://toolfyra.com/lorem-ipsum-generator.html · https://toolfyra.com/ai-essay-generator.html · https://toolfyra.com/ai-story-generator.html · https://toolfyra.com/ai-email-writer.html
Calculators (the deep end) — https://toolfyra.com/bmi-calculator.html · https://toolfyra.com/age-calculator.html · https://toolfyra.com/percentage-calculator.html · https://toolfyra.com/compound-interest-calculator.html · https://toolfyra.com/mortgage-calculator.html · https://toolfyra.com/scientific-calculator.html
Security & developers — https://toolfyra.com/password-generator.html · https://toolfyra.com/md5-hash-generator.html · https://toolfyra.com/sha256-hash-generator.html · https://toolfyra.com/uuid-generator.html · https://toolfyra.com/base64-encode.html · https://toolfyra.com/json-formatter.html · https://toolfyra.com/regex-tester.html
The complete index
Categories drift; the sitemap doesn't. The full machine-readable index of every page lives at https://toolfyra.com/sitemap.xml — 4,200+ URLs, updated with each release. Bookmark it; it's the only list that never goes stale. The human-readable hub is https://toolfyra.com/, and the AI-agent-readable one is https://toolfyra.com/llms.txt.
Two closing notes. First, everything above is free with no accounts — the business model is ads on pages, never paywalls on tools. Second, if a tool here doesn't behave the way on-device promises (watch the Network tab), that's a bug report I genuinely want.
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