About Jyosan Labs

Jyosan Labs is an independent project that builds small web tools for everyday tasks. Each tool is meant to do one job without asking for an account.

The tools

ExactKB: Make a photo, signature or PDF fit an upload limit. Application forms often reject a file for being a few kilobytes too large. ExactKB shrinks it to the size the form asks for. Files are processed in your browser and are never uploaded.

Reworder: Rewrite, correct or shorten your own writing with AI. Paste up to 1,000 words and get the result in a few seconds, with the changed words highlighted. There is no account, and the result is always shown in full.

How they are paid for

The tools are free to use and are paid for by advertising. There is no paid plan and nothing is held back for paying users.

Your files and text

Each tool handles what you give it differently, and each has its own privacy policy that says exactly what happens. This site's own policy is on theprivacy page.

Get in touch

Problems, questions and requests for a new tool are welcome on thecontact page.