Generate cryptographically random UUID v4 identifiers using your browser's crypto.randomUUID() API. Bulk generation, multiple formats — fully offline.
1b05f5af-3ea1-476e-855b-cc88adbc7af931f29ed1-2c23-47b1-8624-e8208894b9606bd96f11-2a01-4787-b054-d40c730076f7c7b123b7-3a8d-4e28-841d-265e33ef3a01de8a7cb6-ed15-43eb-86c1-61fee09d3928xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where y is 8, 9, a, or b. UUIDs are generated using window.crypto.getRandomValues() — the browser's cryptographically secure random number generator — ensuring statistically unique identifiers every time.
Generate 1 to 100 UUIDs at once. Copy them all to clipboard in a single click — perfect for seeding databases, creating test fixtures, or generating batch identifiers.
Output in standard hyphenated format (xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx), uppercase, lowercase, or no-hyphen format to match your specific database or API requirement.
UUID (Universally Unique Identifier), also known as GUID (Globally Unique Identifier), is a 128-bit label used to uniquely identify information in computer systems. They are widely used as primary keys in databases, session tokens, file names, API resource IDs, and anywhere a unique identifier is needed without a central issuing authority.
UUID v4 is randomly generated (122 random bits + 6 version/variant bits), making it the most commonly used version for general purposes. UUID v1 is time-based (includes the MAC address and timestamp). UUID v5 is name-based using SHA-1 hashing. For most applications, v4 is the recommended choice.
The probability of a collision is astronomically low — approximately 1 in 5.3 × 10^36. You would need to generate over a quintillion UUIDs to have even a 50% chance of a single collision. In practice, UUID v4 values are treated as universally unique for all real-world applications.