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UUIDs, generated in bulk

Cryptographically secure version 4 UUIDs and GUIDs, formatted however you need them, generated entirely on your device.

Web Crypto API secure
Generated Keys (0)

Generation Controls

10
150100
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Understanding UUID v4

Unlike v1 (time-based) or v5 (namespace-hash) UUIDs, version 4 uses almost entirely random values, aside from six bits marking the version and variant. That means no predictable links between records, which is why it's the default choice for distributed databases, security tokens, and session keys.

Cryptographic randomness

This generator uses the browser's native crypto.randomUUID(), which draws from your operating system's entropy pool, far more robust than a plain Math.random() call.

Collision odds

The 128-bit structure yields roughly 340 undecillion possibilities. For practically any application, even at massive scale, duplicate identifiers never happen.

Common questions

What is a UUID or GUID?

A Universally Unique Identifier (UUID), also called a GUID, is a 128-bit number used to identify data in computer systems. Standard UUIDs are formatted in five hyphen-separated groups (8-4-4-4-12), 36 characters total.

How secure is this UUID generator?

This tool is privacy-first. Generation happens entirely in your browser via the native Web Crypto API (crypto.randomUUID()). No generated IDs are ever transmitted to or stored by our servers.

What is the chance of a UUID collision?

For version 4 UUIDs, the collision probability is practically zero. With 122 bits of entropy, there are about 5.3 undecillion possible combinations, generating a billion UUIDs a second for 85 years would still give roughly a 50% chance of one collision.

What is the difference between uppercase and braces formatting?

Unix and web environments (JavaScript, Java) typically use lowercase, hyphenated UUIDs. Microsoft environments (Windows Registry, C# GUIDs) often use UPPERCASE wrapped in braces, like {550E8400-E29B-41D4-A716-446655440000}. This tool toggles between both instantly.