UUID Generator
Generate random UUID v4 identifiers instantly. Create single or bulk UUIDs for databases, APIs & development projects.
How to Use
- Set the Quantity of UUIDs to generate (1–500).
- Choose your preferred Format — standard, no dashes, uppercase, braces, or URN.
- Click Generate to create UUIDs instantly.
- Click the clipboard icon next to the single UUID display to copy one UUID.
- Use Copy All to copy all generated UUIDs at once.
Features
Bulk Generation
Generate up to 500 UUIDs at once for batch operations.
5 Formats
Standard, no-dash, uppercase, braces, and URN formats.
Crypto-Secure
Uses crypto.getRandomValues for true randomness.
Instant
Generate hundreds of UUIDs in milliseconds.
Use Cases
- Database Keys: Create unique primary keys for database records.
- API Development: Generate request IDs, session tokens, and correlation IDs.
- Microservices: Create unique identifiers for distributed system tracking.
- Testing: Generate test data with unique identifiers for QA.
- File Naming: Create unique filenames to prevent collisions.
Benefits
- Cryptographically secure random generation.
- Bulk generation for batch operations and testing.
- Multiple format options to match your requirements.
- No server dependency — runs entirely in your browser.
- RFC 4122 compliant UUID v4 format.
Understanding UUIDs
A UUID (Universally Unique Identifier) is a 128-bit identifier that is guaranteed to be unique across space and time. UUID v4, which this tool generates, uses random or pseudo-random numbers to create identifiers with an extremely low probability of collision — the chance of generating two identical UUIDs is approximately 1 in 5.3 × 10^36.
UUID v4 Format
A standard UUID v4 looks like this: 550e8400-e29b-41d4-a716-446655440000. It consists of 32 hexadecimal digits arranged in five groups separated by hyphens (8-4-4-4-12). The version number (4) is encoded in the 13th digit, and the variant bits are encoded in the 17th digit. This format is defined by RFC 4122 and is universally recognized across programming languages and platforms.
Why Use UUIDs Over Auto-Increment IDs?
Unlike sequential auto-increment IDs, UUIDs can be generated independently on different servers without coordination. This makes them ideal for distributed systems, microservices architectures, and offline-first applications. They also prevent information leakage — unlike sequential IDs, UUIDs do not reveal the number of records in your database or the order in which they were created.
Developer Workflow
UUIDs are commonly used alongside other developer tools. Generate random strings for passwords with the Password Generator. Encode UUIDs for URL parameters using the URL Encoder Decoder. Test your UUID-based APIs in the Online Code Editor. Convert timestamps associated with your UUIDs using the Timestamp Converter.
Frequently Asked Questions
Are these UUIDs truly unique?
Yes. UUID v4 uses cryptographically secure random numbers. The probability of a collision is astronomically low — about 1 in 5.3 × 10^36.
What UUID version does this generate?
This tool generates UUID v4 (random) identifiers, the most commonly used version for general-purpose unique IDs.
Is it cryptographically secure?
Yes, the tool uses the Web Crypto API (crypto.getRandomValues) for generating random values.
How many UUIDs can I generate at once?
You can generate up to 500 UUIDs in a single batch.
What formats are available?
Standard (with dashes), no dashes, uppercase, with braces {}, and URN format (urn:uuid:...).
Can I use these in production?
Absolutely. These are valid RFC 4122 compliant UUID v4 identifiers suitable for production use.
Is it free?
Yes, 100% free with no limits.