About offlineutils.com

What this is

offlineutils.com is a free collection of 27+ developer and creator utilities — JSON formatting, JWT decoding, hashing, password generation, image conversion, EXIF stripping, QR codes and more — that all run 100% in your browser. No uploads, no tracking, no accounts. The guiding principle is that the data you paste into a utility is often sensitive (production payloads, customer data, draft copy) and there's no good reason for it to leave your tab.

The site is built with Next.js 16, React 19, TypeScript, and Tailwind v4. Every tool is statically generated so the content is available to AI crawlers in the initial HTML response, and runs entirely on native Web APIs (JSON.parse, crypto.subtle, RegExp, URL, canvas) so there's no server doing the work.

Why offline-first

Most developer tool sites send your paste to a server, run it through a backend, and return the result. That model has a long history of accidental leaks — server logs that capture "test" JWTs, analytics scripts that exfiltrate paste contents, breach disclosures that surface six months later. Offline tools sidestep the entire category of risk: if the computation happens on your device, there's nothing for a third party to log, breach, or hand over.

The trade-off is small. Modern browsers ship every primitive a formatter or hash generator needs. The result is the same correctness, the same speed, and a meaningful privacy gain — for free.

What offlineutils.com covers

The site is organized around four categories. Each category page is a comprehensive hub linking to every tool in it:

Feedback & requests

offlineutils.comis shaped by everyday developer workflows and by what people ask for. If a tool is missing or something feels off, that's the kind of feedback that drives what gets built next.