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Generate version 4 UUIDs (RFC 4122) in bulk, with or without hyphens, in upper or lower case. Cryptographically secure, generated locally in your browser, and completely free.
Your UUIDs
8ae01635-9f84-4360-9550-b120825ec92d 4a1b57d1-a9d9-4026-8d94-a790b84d2298 30398b20-51b3-486b-92d3-8b9e390cf29c da5fe72f-965d-4c01-b2c8-b9e8648870a7 d2024e36-8d73-4132-97cd-41e15191508f
RFC 4122 version 4 UUIDs generated in your browser with the Web Crypto API. Nothing is sent to a server.
A UUID (Universally Unique Identifier) is a 128-bit number formatted as 36 characters — 32 hex digits with four hyphens, like 550e8400-e29b-41d4-a716-446655440000. Version 4 UUIDs are generated from cryptographically secure random bytes, so every value produced is effectively unique across all devices and all time.
UUIDs are the industry standard for database primary keys, API resource identifiers, session tokens and distributed systems where two machines must never assign the same ID. Because they are created locally, a system keeps working even when offline or partitioned.
There is no technical difference. GUID (Globally Unique Identifier) is Microsoft's name for the same format, widely used in Windows development and .NET. UUID is the term used by the RFC 4122 standard, IETF, and the open-source and web ecosystems. The two are interchangeable in practice.
Both follow the same version-and-variant layout: a version digit (4 for the random type this tool generates) sits in the third group, and the variant bits sit in the fourth. If you ever need to tell them apart, this tool only ever outputs version 4.
Version 4 UUIDs are the most common choice for new systems because they need no coordination: each value is just 122 bits of strong random data. There is no timestamp or MAC address to leak, and no central authority to ask for a range.
Version 1 (time-based) UUIDs reveal when an ID was created and can expose the generating machine, so security-conscious developers prefer v4. Our generator uses the browser's native Web Crypto API, giving you the same quality of randomness operating systems use for key generation — no Math.random shortcuts.
Generate IDs in bulk and paste them straight into your project: database seed scripts, API mocks, test fixtures and migration files are the most common use cases. The hyphen-free (32-character) form is useful for MongoDB ObjectId-style fields and compact storage.
Many databases, including PostgreSQL and SQL Server, can also generate UUIDs natively with gen_random_uuid() and NEWID(). Use this tool when you need a batch of IDs now, or to compare with how your backend formats them. While you are setting up your database, our JSON formatter and SHA hash generator round out a developer's quick toolkit.
Frequently Asked
Common questions about generating UUIDs, answered by our web experts.
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