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UUID Generator - Online UUID/GUID Generator

UUIDs are generated entirely in your browser. No data is sent to our servers.

When you need unique identifiers for database rows, API requests, test data, or client - side keys, generating UUIDs manually is not practical and can cause collisions.

Generate random UUIDs (v4) and GUIDs instantly. Create unique identifiers for databases, APIs, and applications.

Show detailed guide & explanations▼

Why you may need this tool

UUIDs are widely used as identifiers for database records, requests, and test fixtures. Generating them manually is risky because format errors and accidental duplicates can occur. When you need multiple IDs quickly, a generator keeps your workflow moving without switching contexts. A reliable UUID format also helps systems validate inputs and reduces time spent debugging “invalid ID” errors.

How to use

Generate one or more UUIDs and copy them directly into your database records, requests, or test fixtures.

  1. Click 'Generate' to create a new UUID
  2. Choose the number of UUIDs to generate (1 - 100)
  3. Select format (uppercase, lowercase, with/without hyphens)
  4. Copy the generated UUIDs

Examples

Creating correlation IDs for log tracing
When debugging multi - step requests, correlation IDs help you connect events across services. Generating a UUID for each request makes tracing and reporting more consistent.
Filling unique keys in sample datasets
Sample data often needs unique identifiers to avoid collisions. Batch - generating UUIDs helps you create realistic fixtures without manual copying mistakes.

Benefits & differentiators

Standard - format UUIDs reduce format - related failures in APIs and databases. Batch generation is useful for tests where each row or object needs a unique key. Using unique request IDs also improves troubleshooting: correlating logs becomes easier when each operation has a stable identifier.

Who this is for

Recommended if you: - need valid UUIDs for APIs, databases, or configs - generate test data that requires unique keys - add correlation IDs to improve troubleshooting - want a quick, repeatable way to create identifiers

FAQ

What is a UUID?
UUID (Universally Unique Identifier) is a 128 - bit identifier that is practically unique across space and time. It's used to identify records in databases, API requests, and more.
What's the difference between UUID and GUID?
They're essentially the same thing. UUID is the standard term, while GUID (Globally Unique Identifier) is Microsoft's terminology. Both refer to the same 128 - bit format.
How unique are these UUIDs?
UUIDs are cryptographically random. The probability of generating the same UUID twice is astronomically low (1 in 2^122), making collisions virtually impossible.
What UUID version does this generate?
We generate UUID version 4 (random), which is the most commonly used version. All bytes except version and variant bits are random.
Can I generate multiple UUIDs at once?
Yes, you can generate up to 100 UUIDs at a time with a single click. Perfect for bulk operations.

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