UUID Generator
Generate random UUID/GUID values
How to uuid generator online
Generate cryptographically random UUID v4 values for use in databases, APIs, and applications.
- Click "Generate UUID" to create a single random UUID.
- Click the "Copy" button to copy the UUID to your clipboard.
- For multiple UUIDs, enter a count (1-100) in the bulk generate section.
- Click "Generate N UUIDs" to create multiple values at once.
- Click "Copy All" to copy all generated UUIDs to your clipboard, one per line.
About UUID Generator
UUIDs (Universally Unique Identifiers), also known as GUIDs (Globally Unique Identifiers), are 128-bit identifiers used throughout software development to uniquely identify records, resources, and entities without relying on a centralized numbering authority. They are essential for distributed systems, database primary keys, API request tracking, session identifiers, and anywhere you need a guaranteed-unique value.
This tool generates version 4 UUIDs, which are based entirely on random numbers. It uses the browser's built-in crypto.randomUUID() API, which produces cryptographically secure random values. Version 4 is the most widely used UUID version because it requires no input data (no MAC address, no timestamp) and can be generated independently by any system with a good random number generator.
The bulk generation feature lets you create up to 100 UUIDs at once, which is handy for seeding test databases, generating configuration files, or pre-allocating identifiers for batch operations. All generation happens locally in your browser — no server is involved, and no UUIDs are logged or stored anywhere.
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Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in five groups separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are designed to be globally unique without requiring a central authority.
What version of UUID does this generate?
This tool generates version 4 UUIDs, which are created using cryptographically secure random numbers via the browser's crypto.randomUUID() API. Version 4 UUIDs are the most commonly used type.
Are the generated UUIDs truly unique?
Version 4 UUIDs have 122 random bits, giving approximately 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically small — effectively zero for any practical use case.
Can I generate multiple UUIDs at once?
Yes. Use the "Bulk Generate" option to create up to 100 UUIDs at once. You can copy all of them to your clipboard with a single click.