UUID / GUID Generator

A UUID (universally unique identifier), also called a GUID, is a 128-bit value written as 32 hex digits in the pattern 8-4-4-4-12, like f47ac10b-58cc-4372-a567-0e02b2c3d479. This generates version 4 UUIDs — the fully random variant — in bulk, with format options for the common database and code styles.

Why UUIDs instead of sequential IDs

A version 4 UUID is generated from random bits rather than a counter, which means two systems can generate IDs independently, with no shared database or coordination, and the odds of a collision are astronomically small — the collision probability across a billion UUIDs is still negligible. That's exactly why they're used as primary keys in distributed databases, as request/trace IDs across microservices, and as session or object identifiers where a simple auto-incrementing number would either leak information (like total record count) or require central coordination to avoid clashes.

Format options

• Standard: f47ac10b-58cc-4372-a567-0e02b2c3d479
• Uppercase: F47AC10B-58CC-4372-A567-0E02B2C3D479
• Braces: {f47ac10b-58cc-4372-a567-0e02b2c3d479} — the format some Windows/COM contexts expect
• No hyphens: f47ac10b58cc4372a5670e02b2c3d479 — compact form for use as a plain string key

Where the randomness comes from

Generated with crypto.randomUUID where the browser supports it, falling back to crypto.getRandomValues built into the correct UUID v4 bit pattern where it doesn't — both are cryptographically secure sources, not the weaker Math.random.