32 free browser tools that never upload your file

Every tool runs on your own machine. The file you drag in is never sent anywhere — no upload, no account, no quota, no watermark. That is not a marketing line here: the page has no network call in it, so you can open devtools and watch nothing leave.

中文工具站 · English tools

What is in it

• Image compression and format conversion, in-browser
• JSON formatter and validator
• Base64, URL encoding, JWT decoding
• Hash generators — MD5, SHA-1, SHA-256
• Regex tester, timestamp converter, UUID generator
• Colour, unit and percentage converters
• llms.txt generator
• A page for every tool, each with the command you would otherwise type in a terminal

Why bother when a CLI exists

Because most of these jobs happen once, on a machine where nothing is installed, for someone who is not going to open a shell. The value is not the algorithm — it is that the algorithm is one click away with no install and no data leaving the laptop.

The sites themselves are audited by the checker above and score 100/100, which is the only claim worth making about a page whose whole selling point is that it works.