About
About DevToolHub
DevToolHub is a free collection of the small tools developers reach for every day: format a JSON payload, test a regular expression, convert YAML to JSON, check a cron expression, hash a webhook body, generate a QR code. There are more than 40 tools across 9 categories, and every one of them runs entirely in your browser.
Why everything runs in your browser
Most online developer tools send whatever you paste to a server, process it, and send it back. That is a privacy problem when the payload contains customer data, tokens, or proprietary configuration. DevToolHub tools do all of their work locally in your browser with JavaScript — your data never leaves your machine. You can even load the page once and go offline: the tools keep working.
What makes the tools good
- Private by design — nothing is uploaded, nothing is stored, no accounts exist.
- Fast — instant first paint and keyboard-first workbenches, no heavy frameworks in the critical path.
- Tested — the transformation logic behind every tool is covered by unit tests against known test vectors.
- Free — no premium tier, no watermarking of output, no artificial limits.
How the site is built
The interface is generated as validated UIDL documents and rendered with uidl-runtime; every tool page is also pre-rendered to static HTML so search engines and slow connections see the full content immediately. The site is deployed on Cloudflare's global network.
Get in touch
Found a bug, or is there a tool you wish existed? Reach us through the contact page — feedback about wrong output is especially welcome, ideally with the input that produced it.