OpenTool
Free online tools pdf and image tool with no signup
What it does
OpenTool is a collection of 294 free, browser-based tools covering PDFs, images, conversions, unit/currency conversion, finance, math, developer utilities, typing tests and India government exam prep. What makes it different: almost every tool runs 100% on your device — your files and inputs never get uploaded. No account, no installs, no watermarks. From compressing a PDF to resizing a photo for SSC/IBPS/JEE/NEET forms, it works on phone or desktop in seconds. Perfect for studnet.
Free online tools for PDFs, images, conversions, calculations and more. Fast browser-based utilities with no signup for everyday tasks.
Twenty-odd categories of handy tools — PDFs, images, calculators, converters and more. No account to make, no file uploads for most of it, and nothing to install. It's simple: we don't want your files. Most tools do everything on your device, so nothing ever gets sent anywhere. A few do need a server — the document converters (PDF↔Word, PDF↔Excel, Excel/Word/PowerPoint→PDF, PDF→PPT) — and those erase your file the moment the job finishes. OpenTool is a free collection of 264 + browser-based utilities for everyday tasks — no account, no email, no watermarks and no usage limits. Everything runs in the tools section of this site, organised into categories like PDF Tools , Image Tools , file…from opentool.tech
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Life & fun · 10d ago · louisabraham.github.io
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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 · 16d ago · simedw.com