Why I stopped pasting production JWTs into random websites (and built an offline tool suite instead)

Ever find yourself copy-pasting bearer tokens or JSON payloads into suspicious online utilities just to troubleshoot issues? I used to do it frequently. Need to inspect an expired JWT? Opened the first Google result. Need to format a massive JSON response from a legacy API? Pasted it into a pop-up ad-infested tab. In search of a PDF merger or an advanced RegEx tester?

Another sketchy website. A few months ago, while debugging an authentication problem on a client's staging database, I caught myself about to paste a raw, unhashed token into a random web tool. I paused, inspected the network request, and realized my data was being sent as a POST request to an analytics backend. That was my breaking point.

The Issue with Free Developer Tools Most of the top search results for developer utilities share a few common problems: Your data leaves your computer: Many tools send your raw strings, files, or tokens to a remote server for processing. Intrusive ads and layout shifts: Five sticky video banners disrupting your focus while you're trying to read a diff.

Slow load times: Heavy server-side processing for tasks that can be done locally in seconds with modern JavaScript. Today, I decided to create a cleaner, offline alternative called Omnikite. This ad-free, browser-based suite runs entirely in your memory, even if you're offline. Here's what I built: 1. Cryptography and Security Tools: Shamir's Secret Sharing for splitting master keys into secure shares.

A CSP header generator with instant Nginx, Apache, and Next.js export. A Shannon Entropy calculator for estimating password strength. 2. Developer Essentials: A JSON formatter and schema validator that handles multi-megabyte payloads without crashing. An interactive JWT debugger that inspects claims, verifies HMAC signatures locally, and checks expiration dates.

An IPv4 CIDR and subnet calculator with auto-generated firewall rules. 3. Browser-Based File Processing: A PDF merger and splitter using WebAssembly for in-browser page handling, and an image converter and SVG minifier. All tools operate without uploading any data to external servers. The platform is entirely free, requires no login, and never transmits your inputs.

I've built a single workspace containing 80 tools, all running locally in your browser. Check it out here: 👉 https://omnikite.vercel.app. I'm curious - what one utility would you find yourself searching for every week? Let me know in the comments below!