Developer
Free browser-based tools for developers. JSON formatting, encoding, hashing, and more. Nothing is sent to any server.
9 tools · 8 languages
All Developer
Base64 encoder / decoder
Encode and decode Base64 in your browser with full UTF-8 support. Works for text, emojis, and non-Latin scripts. Private and instant.
Hash generator
Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text. Everything runs in your browser — your input never leaves your device.
HTML entities encoder & decoder
Convert text to HTML entities and back. Choose special-chars-only, all non-ASCII, or numeric-only output. Idempotent encoding, robust decoding. Runs locally.
JSON formatter
Format, validate, and minify JSON in your browser. Pretty-print with 2/4/tab indent, sort keys, and spot errors instantly. Nothing leaves your device.
JWT decoder
Inspect any JSON Web Token entirely in your browser. See header, payload, signature, and humanised claims. Tokens are never uploaded, logged, or saved.
Slug generator
Convert any text into a clean, URL-safe slug. Choose hyphen, underscore, dot, or none; control case; transliterate diacritics. Live update, runs locally.
Timestamp converter
Convert Unix timestamps to human dates and back. ISO 8601, UTC, local, and relative formats. Auto-detects seconds vs milliseconds. All formatting via Intl APIs.
URL encoder / decoder
Percent-encode and decode URLs with component or full-URL modes. Parse any URL into protocol, host, path, query, and hash. Everything runs locally.
UUID generator
Generate random UUID v4 identifiers in your browser. Standard, no-dashes, or uppercase formats. Bulk generate up to 1000. Cryptographically random.