The Developer Toolbox
You'll Actually Keep Open
Every tool runs entirely in your browser. Your data never leaves your machine. No accounts, no tracking, no nonsense.
Formatting
1Format and beautify JSON, SQL, HTML, CSS, and more.
Encoding
3Encode and decode data between formats like Base64, URL, and JWT.
Base64 Encoder Decoder
Free online Base64 encoder decoder — encode text to Base64 and decode Base64 strings instantly. 100% browser-based, no data sent to servers.
JWT Decoder
Free online JWT decoder — paste any JSON Web Token to instantly view the header, payload, and expiry. 100% browser-based, your token never leaves your machine.
URL Encoder Decoder
Free online URL encoder decoder — encode special characters to percent-encoded format and decode URLs instantly. Browser-based, no data sent to servers.
Generators
2Generate UUIDs, cron expressions, Docker configs, and other structured output.
UUID & GUID Generator
Free online UUID & GUID generator — create random UUID v4 instantly. Bulk generate up to 100, toggle uppercase, one-click copy. 100% browser-based.
Password Generator
Free strong password generator — create secure random passwords up to 128 characters with custom length, symbols, and charset. Browser-based, never stored.
Validators
2Validate JSON, emails, regexes, and other data formats.
Regex Tester
Free online regex tester — test and debug regular expressions with live match highlighting, named capture groups, and full flag support. No signup.
JSON Validator
Free online JSON validator — check JSON syntax instantly, detect errors with exact line and column numbers. Supports schema validation. 100% browser-based.
Security
1Hash generators, password strength checkers, and security analysis tools.
Converters
1Convert between data formats: JSON to TypeScript, CSV to JSON, and more.
No tools match your search. Try a different keyword.