UUID Generator
Generate results with the Uuid Generator — set your parameters and get cryptographically-random output instantly. Free, runs in browser, no data stored.
Formula
Output = Structured transform(Input)
This UUID Generator processes and transforms input content based on deterministic formatting/parsing rules.
Worked Examples
Example 1: Generate Database Primary Key
Problem:Create a unique ID for a new user record before inserting into database.
Solution:Generate 1 UUID:\n\nResult: f47ac10b-58cc-4372-a567-0e02b2c3d479\n\nUse as primary key:\nINSERT INTO users (id, name, email)\nVALUES ('f47ac10b-58cc-4372-a567-0e02b2c3d479', 'John', 'john@email.com');\n\nBenefit: ID is known before insert, enabling related records to be created simultaneously.
Result:UUID ready for database insertion
Example 2: Batch Generate for Import
Problem:Need 10 unique IDs for bulk importing products.
Solution:Set count to 10, click Generate:\n\n1. 550e8400-e29b-41d4-a716-446655440001\n2. 6ba7b810-9dad-11d1-80b4-00c04fd430c8\n3. 6ba7b811-9dad-11d1-80b4-00c04fd430c8\n... (7 more)\n\nCopy all, paste into spreadsheet column, then import with your product data.
Result:10 unique UUIDs for bulk import
Example 3: API Resource Identifier
Problem:Create unique identifiers for REST API resources.
Solution:Generate UUID for each resource:\n\nEndpoint: /api/orders/9b1deb4d-3b7d-4bad-9bdd-2b0d7b3dcb6d\n\nAdvantages:\n- Client can generate ID before POST\n- No sequential pattern to guess\n- Safe to expose publicly\n- Works in distributed systems\n\nStore in database as the order's primary key.
Result:UUID-based API resource URL
Frequently Asked Questions
What is a UUID and what does it stand for?
UUID stands for Universally Unique Identifier. It's a 128-bit number used to uniquely identify information in computer systems. UUIDs are formatted as 32 hexadecimal digits displayed in 5 groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx (8-4-4-4-12). With 2^128 possible values (340 undecillion), the probability of generating duplicate UUIDs is astronomically low.
What is the difference between UUID and GUID?
UUID and GUID are essentially the same thing. UUID (Universally Unique Identifier) is the standard term used in most contexts and defined by RFC 4122. GUID (Globally Unique Identifier) is Microsoft's term for the same concept, used in Windows, .NET, and Microsoft documentation. Both refer to 128-bit unique identifiers with identical format and generation methods.
What are the different UUID versions?
UUID has 5 versions: v1 uses timestamp + MAC address (reveals creation time/location). v2 is DCE Security version (rarely used). v3 uses MD5 hash of namespace + name. v4 uses random/pseudo-random numbers (most common, what we generate). v5 uses SHA-1 hash of namespace + name. Version 4 is preferred for most applications due to simplicity and privacy.
How do I validate a UUID format?
Valid UUIDs match this pattern: 8 hex digits, hyphen, 4 hex digits, hyphen, 4 hex digits (version number first), hyphen, 4 hex digits (variant first), hyphen, 12 hex digits. Version 4 UUIDs have '4' as the first digit of the third group. The regex pattern: /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i