The fastest developer tools
on the web
Format, validate, encode, decode, and convert. Built for developers, by developers.
Peregrine Dev provides 22 free developer utilities — JSON formatter, regex tester, base64 encoder, password generator, and more. All tools run in your browser with zero data sent to any server.
Data & Format
Parse, format, and convert data
Encode & Generate
Encode, decode, hash, and generate
Web & Color
Colors, tokens, and web tools
Why Peregrine Dev
Privacy First
Your data never leaves your device. All processing happens locally in your browser — zero bytes sent to any server.
100% Free
Every tool is completely free with no hidden limits, no watermarks, and no usage restrictions.
No Sign-up
Start using any tool instantly. No account, no email, no personal information required.
From the Blog
View all postsJSON Formatting Best Practices for Developers
Learn how to write clean, valid JSON. Covers formatting conventions, common validation errors, and tools to make your life easier.
Regex Cheat Sheet: The Most Useful Patterns
A practical reference for the most common regular expressions. Covers email, URL, phone number, IP address patterns and more.
Base64 Encoding Explained: When and Why to Use It
Understand what Base64 encoding is, how it works, and when you should (and shouldn't) use it in your applications.