UUID / GUID Generator
Generate UUIDs for development, testing, databases, and API payloads. The page explains versions, formats, bulk output, and validation so developers can copy the exact shape they need.
Paste a UUID to see version and variant.
How to Use UUID Generator
- Choose the UUID version, count, and output format.
- Generate IDs and review the output as a code-friendly block.
- Copy all values, download them, or validate a pasted UUID when needed.
Features
- UUID v4 and time-ordered UUID guidance
- Bulk generation language for larger test sets
- Format options such as no hyphens, braces, URN, JSON, and SQL
- Validation and decode workflow context
- Copy and download result actions
UUID Generator: practical uses
This UUID generator targets UUID generator, UUID v4, UUID v7, GUID generator, and validate UUID searches. The copy is practical for developers and avoids thin one-line output pages.
Why it helps
- Best for: Creating IDs for databases, fixtures, API tests, and local development.
- Privacy: The page keeps the privacy message close to the working area.
- Next step: Use the hash generator or JSON formatter when building test payloads.
Frequently Asked Questions
What is a UUID?
UUID stands for Universally Unique Identifier. It is a 128-bit label used to uniquely identify objects in computer systems. The standard format is 32 hexadecimal characters arranged in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
What is the difference between UUID and GUID?
GUID (Globally Unique Identifier) is Microsoft's implementation of the UUID standard. They are functionally identical — a UUID and a GUID have the same format and the terms are often used interchangeably in software development.
Is UUID v4 truly unique?
UUID v4 uses 122 bits of randomness, giving approximately 5.3 × 10^36 possible values. The probability of generating a duplicate is astronomically low — you would need to generate billions of UUIDs per second for millions of years before a collision becomes statistically likely.
What is the Nil UUID?
The Nil UUID is a special UUID where all 128 bits are zero: 00000000-0000-0000-0000-000000000000. It is defined in RFC 4122 and is typically used as a placeholder or sentinel value in applications that require a known "empty" UUID.
Can I use these UUIDs in production databases?
Yes. The UUIDs generated here use the browser's built-in crypto.randomUUID() or crypto.getRandomValues(), which are cryptographically secure and suitable for use as primary keys in databases, session tokens, or any other production use case requiring unique identifiers.
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