All developer tools

DevToolbox offers 8 free developer utilities that run entirely in your browser: encoders and decoders (Base64, URL, JWT), a JSON formatter and validator, a UUID v4 generator, a Unix timestamp converter, a SHA hash generator, and a URL slugifier. None of them upload your input, require a sign-up, or store what you paste.

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Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text, fully in your browser.

JSON Formatter & Validator

Pretty-print, minify and validate JSON with clear, line-aware error messages.

URL Encode / Decode

Percent-encode or decode URLs and query-string components instantly.

UUID v4 Generator

Generate cryptographically-random RFC 4122 version 4 UUIDs in bulk.

Unix Timestamp Converter

Convert Unix epoch seconds or milliseconds to a human date, and back.

SHA Hash Generator

Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.

Slugify — URL Slug Generator

Turn any title into a clean, lowercase, URL-safe slug.

JWT Decoder

Decode the header and payload of a JSON Web Token without verifying the signature.