About blackdroid.dev
blackdroid.dev is a growing collection of free online tools for developers — 180+ utilities covering JSON, XML and YAML, encoders and decoders, text and number converters, generators, image and PDF tools, 3D-printing helpers, networking utilities and more.
It also hosts a few small apps — Mail Blackhole, fake SMTP mailboxes for testing email flows, and Watchdroid, uptime monitors with alerts — which need a free Google or GitHub sign-in.
Privacy-first
Almost every tool runs entirely in your browser: what you paste or type stays on your device, which makes the tools fast, available offline once loaded, and safe for sensitive data. A few features do talk to our server — the AI tools, URL-fetching validators, and the hosted apps that store data in your account. Details are in the privacy policy.
Support the site
The site is free and supported by unobtrusive advertising. If you find it useful, you can also ☕ Buy me a coffee.
Found a bug or have an idea for a tool we should add? Open an issue on the public issue tracker or write to hello@blackdroid.dev.