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Free developer tools
Instant, browser-based tools to validate, encode, convert, generate, and inspect data — no sign-up, nothing leaves your browser.
Config Validator — Validate, Format & VisualizeValidate, format, and visualize JSON, YAML, and TOML config files.
Encoding
Base64 Encode / DecodeEncode text to Base64 or decode Base64 back to text — instantly, in your browser.URL Encode / DecodePercent-encode or decode URLs and query parameters safely.JWT Decoder & ValidatorDecode a JWT to inspect its header and payload, and verify HS256 signatures.JWT GeneratorCreate and sign your own JSON Web Token with an HS256/384/512 secret.JWT ValidatorVerify a JWT signature and check expiry and not-before claims — pass or fail.
Converters
Generators
UUID GeneratorGenerate random v4 UUIDs (and a nil UUID) — one or many at a time.Mock JSON Data GeneratorGenerate realistic fake JSON test data from a simple template.Password GeneratorGenerate strong random passwords with custom length and character sets.Hash GeneratorGenerate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text.Unix Timestamp ConverterConvert Unix epoch timestamps to human dates and back.
Utilities
Regex TesterTest regular expressions against sample text with live match highlighting.Cron Expression ExplainerTranslate a cron expression into plain English you can actually read.Diff CheckerCompare two blocks of text and highlight every added and removed line.Color ConverterConvert colors between HEX, RGB, and HSL with a live preview.Case ConverterConvert text to camelCase, snake_case, kebab-case, Title Case, and more.