UUID/GUID Generator
Generate UUIDs and GUIDs in multiple formats. Supports v4 (random), v1 (timestamp), and nil UUIDs. Bulk generation up to 1000 UUIDs with validation. 100% free and private.
Generator Options
UUID Validator
Validate if a string is a valid UUID. Supports various formats including with/without hyphens, braces, and URN notation.
UUID Format Examples
550e8400-e29b-41d4-a716-446655440000550E8400-E29B-41D4-A716-446655440000550e8400e29b41d4a716446655440000{550e8400-e29b-41d4-a716-446655440000}urn:uuid:550e8400-e29b-41d4-a716-44665544000000000000-0000-0000-0000-000000000000Bulk Generation
Generate up to 1000 UUIDs at once for your projects.
100% Private
All generation happens in your browser. Nothing is sent to a server.
Multiple Formats
Support for various UUID formats and display options.
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information in computer systems. It's also known as GUID (Globally Unique Identifier). UUIDs are commonly used in databases, distributed systems, and software development to ensure unique identifiers across different systems.
What's the difference between UUID v4 and v1?
UUID v4 is randomly generated using cryptographically secure random number generation when available, making it the most commonly used version. UUID v1 is timestamp-based and includes the generation time and node information (like MAC address). V4 is preferred for most use cases due to its simplicity and privacy.
How many UUIDs can I generate at once?
You can generate between 1 and 1000 UUIDs in a single operation. For bulk generation, simply specify the number you need in the "Number of UUIDs" field. All UUIDs are generated instantly in your browser.
Are the generated UUIDs truly unique?
UUID v4 uses cryptographically secure random number generation (crypto.randomUUID()) when available in modern browsers. The probability of generating duplicate UUIDs is astronomically low (approximately 1 in 2^122), making collisions virtually impossible in practice.
Can I validate existing UUIDs?
Yes! Use the UUID Validator section to check if a string is a valid UUID. The tool supports various formats including standard format with hyphens, without hyphens, with braces, and URN notation. It validates UUID versions 1-5 and nil UUIDs.
What output formats are supported?
The tool supports multiple output formats: lowercase (default), uppercase, without hyphens, with braces, and URN format. You can also choose how to display multiple UUIDs: as a list (one per line), JSON array, or CSV format.