UUID Generator
Generate one or hundreds of random UUIDs (v4).
100% in your browser — nothing uploadedGenerate random UUID v4 identifiers
About this UUID generator
A UUID (universally unique identifier) is a 128-bit value like 3f8a2c1e-9b4d-4e6a-8f2b-1c9d8e7f6a5b, used as database keys, request IDs, and file names where collisions must be practically impossible. Version 4 UUIDs are generated from random data.
This generator uses crypto.randomUUID(), your browser’s cryptographically secure generator. Generate up to 1,000 at once, with options for uppercase output or removing dashes, and copy the whole list in one click.
FAQ
Can two UUIDs collide?
With 122 random bits, the chance is so small it’s ignored in practice: you’d need to generate billions per second for centuries to expect one collision.
What’s the difference between v4 and v7?
v4 is fully random. v7 embeds a timestamp so IDs sort by creation time — better for database indexes. v4 remains the most widely supported.
Are these UUIDs safe for production?
Yes — they come from your browser’s cryptographic random source, identical in quality to what a backend library would produce.