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Encode and decode Base64 for text and files, with URL-safe output and correct UTF-8 handling.

Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more.

Hash text or files with SHA-1, SHA-256/384/512, MD5 and CRC32 — all computed locally.

Format, validate and minify JSON in your browser, with exact error locations.

Decode JWT header and payload locally, read exp and iat as human dates. Signature not verified.

Test regular expressions live with match highlighting, capture groups and replace preview.

Convert Unix seconds or milliseconds to readable dates in any timezone, and back again.

Generate UUID v4 and v7 in bulk with uppercase and no-dash options.