About

100 free online tools, ready to use, with your data staying on your device.

Our philosophy

5l5l Online Tools is a privacy-first collection of free utilities. We believe good tools should not cost your privacy: every tool on this site runs locally in your browser, so what you enter is never uploaded or stored. We focus on building great tools while your data stays yours.

Broad coverage

We now offer 100 tools across 9 categories — date & time, finance, health, text, image, developer, unit conversion, math, and random/encoding — with more on the way.

Free, no sign-up

All tools are completely free and require no registration; just open the page and use them. We cover server and development costs through third-party ads (Google AdSense) shown on the pages — thank you for your support.

Contact & feedback

Tell us which tools you would like next, or report any issue, through the feedback channel on the home page.