Free Online JSON & Developer Tools
Format and validate JSON, decode JWTs, test regex, convert data, generate UUIDs, process images, and use 100+ developer utilities without uploading your data.
Developer utilities used every day
JSON Formatter
Free online json formatter that processes your data locally in your browser.
Base64 Encoder
Free online base64 encoder that processes your data locally in your browser.
JWT Decoder
Free online jwt decoder that processes your data locally in your browser.
UUID Generator
Free online uuid generator that processes your data locally in your browser.
Regex Tester
Free online regex tester that processes your data locally in your browser.
Password Generator
Free online password generator that processes your data locally in your browser.
Browse free tools by category
Find the right browser-based utility for your task.
JSON Tools
12 free online utilities
Encoding Tools
8 free online utilities
Text Tools
17 free online utilities
Developer Tools
30 free online utilities
Web Tools
0 free online utilities
Data Conversion Tools
0 free online utilities
Image Tools
12 free online utilities
Generator Tools
16 free online utilities
Date & Time Tools
8 free online utilities
Security & Hash Tools
7 free online utilities
Your data stays in your browser
Every tool runs locally in your browser. JSON, source code, tokens, images, passwords, and generated results are not uploaded to JSONUtility.in.
Why use JSON Utility?
- 100+ free tools with no signup
- Fast, responsive and accessible interface
- Light and dark themes
- Local favourites and recently used tools
- Works on desktop and mobile browsers
Frequently asked questions
Is JSONUtility.in free?
Yes. Every available developer utility is free and requires no account.
Is my tool data uploaded?
No. Inputs and results are processed locally inside your browser.
Which tools are available?
The site includes JSON, encoding, text, developer, generator, security, date, conversion, and image tools.