Free4Dev
Browse Tools
Encoding
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.
Formatting
JSON Formatter & Validator
Free online JSON formatter and validator. Beautify, validate, and minify JSON in your browser. Syntax errors shown with line numbers. No signup required.
Generators
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
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.
Converters
Unix Timestamp Converter
Free online Unix timestamp converter — convert epoch time to date and back. Supports seconds and milliseconds (13-digit), Discord timestamps, live clock.
Security
Hash Generator
Free online hash generator — compute MD5, SHA-1, SHA-256, SHA-512, and SRI hashes instantly. Hashing runs in your browser; data never leaves your device.
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Formatting
Formatting Tools
Format and beautify JSON, SQL, HTML, CSS, and more.
1 tool
JSON Formatter & Validator
Free online JSON formatter and validator. Beautify, validate, and minify JSON in your browser. Syntax errors shown with line numbers. No signup required.
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Encoding
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Generators
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Validators
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Security
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Converters
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