Browser-only collection
Developer Tools
Inspect, transform, compare, and generate common development values with focused tools that open directly and return copy-ready results.
Included utilities
8 focused tools
Code formatter & beautifierFormat and syntax-color JavaScript, TypeScript, JSON, CSS, HTML, Markdown, and PHP locally.JavaScript, JSON & CSS minifierMinify JavaScript, JSON, or CSS with syntax-aware, bundled processors in your browser.URL parserBreak a URL into protocol, host, path, query parameters, and fragment.JWT decoder & verifierDecode claims, check time validity, and optionally verify a signature with an uploaded PEM certificate or public key.Hash & checksum calculatorCalculate CRC32, MD5, SHA-1, SHA-2, or SHA-3 digests locally as you type.UUID generatorCreate cryptographically random UUID v4 or time-ordered UUID v7 identifiers.Semantic version compareValidate and compare two SemVer 2.0 version strings.Color converterConvert colors between HEX, RGB, and HSL formats.
Why local-first
Useful results without a remote processing service
Free browser utilities for code, URLs, JWT verification, hashes, UUIDs, semantic versions, and colors, built for quick development checks. Input remains in the current tab, and every included utility states its boundaries before you rely on the output.
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