ToolBox is live: 65 free online tools, all running locally
Today toolboxhub.dev goes live — a free online toolbox with 65 tools in 8 categories: encoding & hashing, JSON processing, code formatters, text tools, unit converters, date calculators, image tools and live code runners. Bilingual English/Chinese.
Why build another tools site
There are plenty of online tools out there, but most share two problems: they bury you in ads, or they send whatever you paste to their servers. Format a JSON snippet that contains an API key, decode a JWT with a session token — and your data has left your machine.
We wanted a clean, genuinely local toolbox: no ads, no sign-up, and every computation happens inside your browser.
How "nothing gets uploaded" works
The site is purely static — there is no backend to receive data. Each tool is a piece of JavaScript that ships with the page and runs locally. You can verify this: open DevTools → Network while using any tool, and you'll see no requests beyond the page's own js/css/images.
- JSON formatting and validation use the browser's built-in parser;
- MD5/SHA/CRC32 are standard implementations bundled with the page;
- Image to Base64 reads files locally via FileReader — zero uploads.
How we picked the 65 tools
We collected the small, high-frequency needs of daily development: convert an encoding, read a timestamp, diff two texts, split a bill. Each tool does exactly one thing and works instantly. Popular tools like JSON Formatter, Regex Tester and Base64 got extra polish — large inputs, precise error positions.
What's next
This blog will keep documenting new tools, advanced usage tips, and front-end techniques used to build the site. Got a tool idea? Tell us — the most requested ones ship first.