UUID / GUID Generator Pro
Secure generation, validation, and formatting for UUIDs
Options
UUID Validator
How to generate UUIDs online?
Generate RFC 4122 compliant UUIDs with our professional UUID generator. Support for version 1, 4, and 5 UUIDs with customizable options. Perfect for unique identifiers, database keys, and distributed systems with guaranteed uniqueness.
Features
- Generate UUID v4 (secure random), v1 (time-based), v5 (namespace-based)
- Format options: hyphens, braces, URN prefix, uppercase/lowercase
- Batch generation up to 500 UUIDs with dedupe and sort
- Built-in validator with version and variant detection
- Privacy-friendly; processing stays in your browser
How to use
- Choose a version (v4, v1, or v5).
- Set count and formatting options.
- Optionally set namespace and name for v5.
- Click Generate and copy or download results.
Tips & Best Practices
- Always validate your data before processing to catch syntax errors early.
- Use the copy button to quickly transfer formatted output to your clipboard.
- For large files, consider breaking them into smaller chunks for better performance.
- Back up your original data before applying any transformations.
- Use keyboard shortcuts for faster workflow: Ctrl+A to select all, Ctrl+C to copy.
FAQ
What is the difference between UUID versions?
v4 uses random data and is recommended for most cases. v1 includes timestamp and node info. v5 is deterministic from namespace and name, useful for generating consistent UUIDs.
Can I generate multiple UUIDs at once?
Yes, you can generate up to 500 UUIDs simultaneously with options to deduplicate and sort the results.
What are the built-in namespaces for v5 UUIDs?
DNS (6ba7b810-9dad-11d1-80b4-00c04fd430c8), URL (6ba7b811-9dad-11d1-80b4-00c04fd430c8), OID (6ba7b812-9dad-11d1-80b4-00c04fd430c8), and X.500 (6ba7b814-9dad-11d1-80b4-00c04fd430c8). This is designed to handle both simple and complex use cases efficiently, giving professional developers a reliable everyday tool.
How do I use custom namespaces for v5 UUIDs?
Select 'Custom UUID' in the namespace dropdown and enter a valid UUID. This allows you to create your own namespace for consistent UUID generation.
What formatting options are available?
You can control casing (uppercase/lowercase), include or exclude hyphens, add braces around the UUID, and include URN prefix (urn:uuid:). or external dependencies.
Is my data secure and private?
Yes, all UUID generation happens locally in your browser. No data is sent to any servers, ensuring complete privacy and security.
How do I validate a UUID?
Use the UUID Validator section to paste any UUID and get detailed information about its validity, version, variant, and formatted output.
What is the difference between UUID and GUID?
UUID (Universally Unique Identifier) and GUID (Globally Unique Identifier) are essentially the same thing. GUID is Microsoft's term for UUID.
Can I use these UUIDs in production?
Yes, the generated UUIDs follow RFC 4122 standards and are suitable for production use in databases, APIs, and distributed systems.
Why would I use v5 instead of v4?
Use v5 when you need deterministic UUIDs - the same inputs will always generate the same UUID. This is useful for creating consistent identifiers from names or URLs.