ZZTools
Privacy-first online tools
What it does
ZZTools (zztools.org) is a comprehensive, free online tools platform built for today's privacy-conscious users. Unlike most online tool websites that process your files on remote servers, ZZTools runs everything directly in your browser — your images, documents, and data never leave your device. With 26+ tools spanning image conversion, PDF manipulation, text processing, financial validation, developer utilities, math generators, and fun life tools.
zztools.org — Free online tools for image processing, text conversion, encryption, random generation and more. All processing happens locally in your browser.
All processing happens locally in your browser. Your files never leave your device. We don't store, transmit, or access your data. No sign-up required to use all core tools. No downloads or installation needed. Minimal design, instant access. Tools run directly in your browser — no downloads, no installation, zero wait time. Convert AQHI (Canada) to AQI (US EPA) free online using PM2.5 as the common reference. Bidirectional conversion with PM2.5 values shown. Runs in your browser. Add Arabic diacritical marks (Harakat) to any Arabic text free online. Features pronunciation guide and Latin transliteration. Perfect for learners and teachers. 100% private. Encode text to Base64 or decode…from zztools.org
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OpenTrailPaper is open-source bike computer firmware for the LilyGO T5S3 4.7" E-Paper PRO. It supports offline maps, GPX routes, FIT recording and Bluetooth sensors.
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Launched alongside, August 2026
the whole month →- TL
Life & fun · 10d ago · louisabraham.github.io
- SA
Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io
I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
AI · 17d ago · simedw.com