UUID Generator
Generate unique UUIDs / GUIDs in bulk
About UUID Generator
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify objects in computer systems. UUID v4 is randomly generated and has a collision probability so low it is practically impossible to repeat. Use this free UUID Generator to create single or bulk UUIDs for database primary keys, API resource identifiers, session tokens and any application that requires globally unique values.
How to Use UUID Generator
- 1Enter how many UUIDs you want to generate (1 to 100).
- 2Click "Generate UUIDs" to create random version-4 UUIDs instantly.
- 3Click any UUID to copy it, or use "Copy All" to copy the full list.
- 4Use the UUIDs directly in your code, database or API.
Common Use Cases
UUID v4 is fully random and the safest choice for most applications. For time-sortable IDs, consider ULID — but UUID v4 is universally supported.
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Frequently Asked Questions
What is a UUID and what is it used for?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify records, objects or resources without needing a central authority to assign IDs. Common uses include database primary keys, API resource IDs, session tokens, distributed system identifiers and file names that must not collide.
What is the difference between UUID v1, v4 and v7?
UUID v1 is time-based and includes the MAC address — it is time-sortable but can expose the generating machine's identity. UUID v4 is purely random — the most common and safest general-purpose choice. UUID v7 (newer) is also random but uses a time-based prefix for natural sorting, making it more database-friendly than v4.
Can two generated UUIDs ever be the same?
In theory yes, but in practice no. UUID v4 has 122 random bits, giving 5.3 × 10³⁶ possible values. The probability of generating a duplicate among a billion UUIDs per second for a billion years is still astronomically small — essentially zero for practical purposes.
Is UUID the same as GUID?
Yes. GUID (Globally Unique Identifier) is Microsoft's name for the same concept. They use the same format and are interchangeable. The UUID format is: 8-4-4-4-12 hexadecimal characters separated by hyphens, e.g. 550e8400-e29b-41d4-a716-446655440000.