About tomz.dev
tomz.dev is a free collection of 47 developer and office utilities — JSON and XML formatters, text tools, Base64 converters, certificate and email-header inspectors, date calculators, and more. It is built and maintained by a software professional as a public, ad-free service.
Private by design
Every tool on this site runs entirely inside your browser. The data you paste or the files you pick are processed with client-side JavaScript and are never uploaded, logged, or stored on any server. You can verify this in your browser's developer tools: no network requests are made when you use a tool. The site works offline once a page is loaded.
There are no user accounts, no cookies, no analytics, no ads, and no third-party scripts. The web server serves static pages and nothing else.
Technology
The site is a statically generated Next.js application served over HTTPS. Tool logic is plain TypeScript running locally; the whiteboard is the open-source Excalidraw editor with its storage in your browser's localStorage.
For network administrators
This site hosts developer utilities comparable to jsonformatter.org or crontab.guru. It serves no executable downloads, collects no data, makes no third-party requests, and requires only standard HTTPS on port 443. If your web filter categorizes this site incorrectly, a recategorization request is welcome — suggested category: Computer & Internet Info / Internet Utilities.