UUID Generator
Generate random UUID v4 identifiers for use in databases, APIs, and more
What is UUID Generator?
UUID Generator creates random UUID v4 identifiers that are practically unique across all systems. UUIDs (Universally Unique Identifiers) are 128-bit values widely used as primary keys in databases, unique identifiers in distributed systems, session tokens, file names, and API resource identifiers. UUID v4 uses cryptographically secure random numbers, making collision probability astronomically low. This tool generates one or multiple UUIDs instantly, with options for uppercase formatting and dash removal. All generation uses your browser's crypto.getRandomValues() API for true randomness, with no server interaction required.
How to Use
- Choose the number of UUIDs to generate (1-100).
- Click 'Generate' to create the UUIDs.
- Use the copy button next to each UUID to copy it individually.
Tips & Best Practices
- Use UUIDs as database primary keys when you need to generate IDs without a central authority.
- Remove dashes for more compact storage in databases or when UUIDs are used in file names.
- Use uppercase UUIDs when working with systems that are case-sensitive and expect uppercase hex.
- Generate multiple UUIDs at once when seeding a database or creating test data.
- Remember that UUID v4 is random-based, so it does not contain any embedded timestamp or machine information.
Use Cases
Database Keys
Generate unique primary keys for database records without coordination between servers.
API Resources
Create unique identifiers for API resources, sessions, and transactions.
File Naming
Generate unique file names to prevent naming conflicts in storage systems.
Testing
Create bulk test data with unique identifiers for development and QA environments.
FAQ
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically unique across all systems. UUID v4 uses random numbers.
Are generated UUIDs truly unique?
UUID v4 generates identifiers with 122 bits of randomness. The probability of collision is astronomically low.
Are the generated UUIDs sent to any server?
No, UUIDs are generated locally using the browser's crypto API and are not transmitted externally.
How is UUID v4 generated?
UUID v4 uses a cryptographically secure random number generator for 122 random bits, with only the version (4) and variant bits being fixed.
What is the probability of UUID collision?
The collision probability of UUID v4 is astronomically low. Even generating a billion per second, it would take about 86 years to produce a duplicate.
Is my data collected?
No, UUIDs are generated entirely in your browser using the Web Crypto API. No data is sent to any server.
How unique are UUID v4 identifiers?
With 122 bits of randomness, you would need to generate 2.71 quintillion UUIDs to have a 50% chance of one collision.
Can UUIDs be used as passwords?
While UUIDs are random, they are not designed for password use. Use a dedicated password generator for that purpose.
What is the UUID format?
UUID v4 follows the format xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx where x is a random hex digit and y is 8, 9, a, or b.
Are UUIDs sequential?
UUID v4 is entirely random with no sequential ordering. If you need time-ordered UUIDs, consider UUID v7.
Can I use UUIDs in URLs?
Yes, UUIDs contain only hex digits and dashes, making them safe for URLs. You can also remove dashes for shorter URLs.