About io9.me
io9.me is a free collection of developer utilities built to make everyday coding tasks faster — without the overhead of sign-ups, paywalls, or sending your data to a server.
What We Build
Every developer regularly needs to format a blob of JSON, decode a Base64 string, convert a Unix timestamp, compare two config files, or test a regex pattern. These are small but frequent tasks. Most online tools for them either require an account, show intrusive ads, send your data to a remote server, or are slow to load.
io9.me is built to be different — a fast, minimal, offline-capable toolbox that runs entirely in your browser. No data ever leaves your machine.
Core Principles
Privacy First
All processing happens in your browser. Your data — code, configs, documents — is never uploaded anywhere.
Zero Friction
No accounts, no email verification, no paywalls. Open a tool and use it immediately.
Works Offline
Once the page loads, everything works without an internet connection — useful in planes, VPNs, or restricted networks.
Built for Developers
Every tool is designed with developer workflows in mind — keyboard-friendly, copy-paste ready, and accurate.
The Tools
Format, validate, minify, and convert JSON
Format, minify, convert XML to JSON
Base64, URL encoding, case conversion, escaping
Side-by-side text and JSON diff
Merge, split, rotate, and watermark PDFs
Live regex matching with capture groups
Escape and unescape HTML entities
Timezone converter, epoch decoder, date calculator, format detector
Technology
io9.me is built with Next.js and TypeScript, styled with Tailwind CSS, and deployed as a static site. All tool logic runs client-side using native browser APIs and carefully chosen open-source libraries.
The site is fully open for personal and commercial use. If you find a bug or have a feature request, reach out via the contact page.