A small collection of free, fast, private online tools that run entirely in your browser.
Util123 is a growing collection of single-purpose online tools — a JSON formatter, a timestamp converter, a password generator, and more. Each tool does one thing and tries to do it well: no sign-up, no installation, no clutter.
Every tool runs 100% client-side. The text, files and values you paste are processed by JavaScript in your own browser and are never sent to our servers. See the privacy policy for details.
Util123 is free to use and supported by advertising. Ads are kept to a single banner at the bottom of each page — never in the way of your work.
Found a bug, have a tool request, or want to report an ad issue? Reach us at hello@util123.top or via the contact page.