Developer tools
Format data and inspect encodings locally.
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JSON formatter and validator
Format, minify and validate JSON while preserving large numbers and rejecting duplicate keys.
Base64 encoder and decoder
Encode local UTF-8 text or a file as Base64/Base64url, and decode to text or a file.
URL encoder and decoder
Encode a complete URI or a component and decode percent escapes locally as text.
JWT inspector
Decode a JWT header and payload locally to inspect their JSON, while keeping its signature explicitly unverified.
UUID v4 generator
Generate a bounded batch of version-4 UUIDs using Web Crypto in your browser.
Text and file hash generator
Compute SHA-256, SHA-384 or SHA-512 for UTF-8 text or the exact bytes of a local file.
Number base converter
Convert an integer between bases 2–36 with BigInt precision, without floating-point conversion.
Unicode inspector
Inspect the original Unicode code points and grapheme clusters, and apply explicit normalization to a separate text result.
Text encoding converter
Convert text or a local file between declared encodings, with an explicit BOM policy and rejection of character loss.
Structural JSON diff
Compare two JSON structures and inspect additions, removals and changes at explicit paths, preserving number spellings without rounding.
YAML and JSON converter
Convert a limited YAML 1.2 subset and JSON locally, preserving exact numeric lexemes and rejecting unsupported structures instead of silently losing data.
HTML entity encoder and decoder
Encode HTML punctuation or decode semicolon-terminated references, with local processing, a text preview and complete copy and download.
Cron expression explainer
Understand five Cron fields and the day-of-month/weekday rule, then preview dates in a selected Gregorian month without creating a schedule.