Developer Toolkit
A fast, private collection of everyday developer tools — timestamps, JSON, regex, Base64, diffs and cron — all free, ad-free, and running entirely in your browser.
100% Local No Uploads Offline Ready
⌘K
Popular
Recently added
Date & Time
Encoding
JSON
Regex
Utilities
Frequently asked questions
- Are these developer tools free?
- Yes — every tool is free, with no sign-up and no ads. They run entirely in your browser.
- Is my data private?
- All processing happens locally in your browser. Nothing you paste is uploaded to a server.
- Can I use the tools offline?
- Yes. DevToolsKit is a PWA — once loaded it works offline and can be installed to your home screen or dock.
DevToolsKit brings the utilities developers reach for every day into one fast, keyboard-first workspace. Convert Unix timestamps and time zones, format and validate JSON, test regular expressions, encode and decode Base64, compare text, and explain cron expressions — without installs, accounts, or ads. Press ⌘K anywhere to jump between tools.