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 sign-up, with tool inputs processed in the browser. See the privacy policy for advertising and traffic measurement.
How "nothing gets uploaded" works
Tool inputs are processed by browser scripts. The site also has a traffic-measurement endpoint; local processing does not mean the whole site makes no network requests. 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 inspect request destinations and payloads to distinguish tool inputs from traffic measurement. Use synthetic examples, not real credentials.
- 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.