Free online developer tools
Format, encode and generate for code & security. 7 free tools, no uploads.
JSON Formatter
Format, validate and minify JSON.
Base64 Encode / Decode
Encode or decode text and files as Base64.
Password Generator
Strong random passwords and passphrases.
NEW
JWT Decoder
Decode, inspect and verify JSON Web Tokens.
NEW
Unix Timestamp Converter
Convert epoch time to dates and back.
NEW
CSV ↔ JSON Converter
Convert CSV to JSON and JSON to CSV.
NEW
Regex Tester
Test, debug and explain regular expressions.
About our developer tools
Handy utilities for developers and anyone who works with data. Format and validate JSON, decode and verify JWTs, test regular expressions, convert Unix timestamps and CSV ↔ JSON, encode Base64 and generate secure passwords — fast and private, with nothing sent to a server.
Which developer tool do I need?
- JSON Formatter
- Format, beautify, validate and minify JSON with clear error messages. Sort keys and copy the result in one click.
- Base64 Encode / Decode
- Encode text or files to Base64 and decode Base64 back to text or files. Supports UTF-8, emoji and URL-safe Base64. Free and private.
- Password Generator
- Generate strong, random passwords and passphrases using your browser’s secure random generator. Check strength instantly.
- JWT Decoder
- Decode JSON Web Tokens to read the header and payload, check expiry dates and verify HS, RS, PS or ES signatures — privately, in your browser.
- Unix Timestamp Converter
- Convert Unix timestamps (seconds, milliseconds, microseconds) to readable dates in any time zone, and dates back to epoch time. Shows the live current timestamp.
- CSV ↔ JSON Converter
- Convert CSV to JSON and JSON to CSV with automatic delimiter detection, header and type options, a table preview and one-click download. Free and private.
- Regex Tester
- Test JavaScript regular expressions with live match highlighting, capture groups, find-and-replace and a plain-English explanation of every part of your pattern.