UUID Generator
Generate cryptographically secure UUID v4 identifiers. Single or bulk generation.
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Bulk Generator
UUID Anatomy
550e8400-e29b-41d4-a716-446655440000
time_low8 hex chars
time_mid4 hex chars
version4 = random
variantclock_seq
node12 hex chars
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Frequently Asked Questions
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information in computer systems. The standard format is 32 hexadecimal digits in 5 groups separated by hyphens: 8-4-4-4-12.
UUID v4 is randomly generated. 122 of the 128 bits are random, 4 bits encode the version (4), and 2 bits encode the variant. The probability of generating two identical UUIDs is astronomically small — roughly 1 in 5.3 × 10³⁶.
Yes. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They are the same format and fully interchangeable.
Yes. This tool uses
crypto.randomUUID(), which is backed by the browser's cryptographically secure random number generator (CSPRNG). It is suitable for security-sensitive use cases like session tokens and API keys.