Generate and validate UUIDs (v4)
Format, validate, and minify JSON data with syntax highlighting
Encode and decode Base64 strings
Test regular expressions with real-time matching
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. UUIDs are fundamental in modern software development, used as primary keys in databases, session identifiers, correlation IDs in distributed systems, and unique references in APIs. The most common version, UUID v4, generates identifiers using cryptographically secure random numbers, making collisions virtually impossible — the probability of generating two identical UUIDs is astronomically small. This free online UUID generator creates version 4 UUIDs using the Web Crypto API (crypto.randomUUID or crypto.getRandomValues), ensuring true cryptographic randomness. You can generate multiple UUIDs at once and copy them all to your clipboard with a single click. The tool also includes a UUID validator that checks whether a given string is a properly formatted UUID. Whether you need UUIDs for database records, message queue identifiers, temporary file names, or testing mock data, this tool provides instant generation right in your browser. No server calls are made, and no generated UUIDs are stored or logged anywhere.