🆔 UUID Generator
Generate UUID v1, v4 and v7 instantly. Bulk generate up to 100 UUIDs, copy all, download as TXT. Free, private, no signup.
What is a UUID Generator?
A UUID generator creates Universally Unique Identifiers — 128-bit values formatted as 32 hexadecimal digits separated by hyphens. This UUID generator produces UUIDs using the Web Crypto API, making each identifier cryptographically random. Developers use a UUID generator to create unique keys for database records, session tokens, file names, and API request tracking without coordinating with a central authority. This UUID generator supports version 1, 4, and 7 formats.
How to Use This UUID Generator
Using this UUID generator takes one click. Select your preferred version (v4 is recommended for most use cases), set the count to generate up to 100 UUIDs at once, and click Generate. Toggle uppercase or remove hyphens for systems that require a specific format. Copy all generated UUIDs at once or download them as a text file. This UUID generator runs entirely in your browser — no IDs are logged or stored.
UUID Generator for Databases and APIs
Database primary keys are one of the most common uses for a UUID generator. Unlike auto-incrementing integers, UUIDs from a UUID generator can be generated client-side without database round-trips, preventing ID collisions in distributed systems. REST APIs use UUID generator output to track requests, mark idempotency keys, and identify resources across microservices. UUID v4 from this UUID generator is suitable for almost every database and API use case.
UUID Versions Explained
Version 1 uses the current timestamp and machine identifier, making UUIDs sortable by creation time. Version 4 uses entirely random bits — it is the most widely used format and what most developers mean when they refer to a UUID generator. Version 7 is a newer format that embeds a millisecond-precision Unix timestamp in the most significant bits, preserving sort order while using random bits for uniqueness. This UUID generator supports all three versions.
UUID Format and Standards
The standard UUID format is 8-4-4-4-12 hexadecimal digits separated by hyphens, for example: 550e8400-e29b-41d4-a716-446655440000. Some systems prefer compact format without hyphens or uppercase letters — this UUID generator includes both toggles. UUIDs are standardised by RFC 4122 and are guaranteed to be unique across space and time with negligible collision probability even across billions of generated identifiers.
- v4 UUIDs use 122 random bits — probability of collision is astronomically low
- Bulk generate up to 100 UUIDs at once and download as a TXT file
- UUID generator runs in-browser via Web Crypto API — nothing stored or logged
- Use UUID v7 when you need time-ordered identifiers for database indexing
- Copy individual UUIDs or use Copy All for batch operations
Frequently Asked Questions
What is a UUID generator?
A UUID generator creates Universally Unique Identifiers — 128-bit values formatted as 32 hexadecimal digits separated by hyphens. This UUID generator produces UUIDs using the Web Crypto API, making each identifier cryptographically secure and suitable for databases, APIs, and any system requiring unique identifiers.
How does this UUID generator work?
This UUID generator uses the Web Crypto API (crypto.getRandomValues() for v4, crypto.randomUUID() when available). It runs entirely in your browser — no servers, no logging, 100% private and fast. Every UUID is generated locally on your device with cryptographically secure random values.
What is the difference between UUID v1, v4 and v7?
UUID v1 uses the current timestamp and machine identifier — making UUIDs sortable by creation time but less random. UUID v4 uses 122 random bits — it is the most common format, best for general use. UUID v7 embeds millisecond Unix timestamp with random bits — modern, time-ordered, and ideal for database indexing. This UUID generator supports all three formats.
Can I generate bulk UUIDs with this UUID generator?
Yes. This UUID generator supports bulk generation of up to 100 UUIDs at once. Set your desired count (1-100), select your preferred version, and click Generate. Then copy all UUIDs to your clipboard or download them as a TXT file for use in databases, imports, or batch operations.
Is this UUID generator cryptographically secure?
Yes. This UUID generator uses the Web Crypto API, which provides cryptographically secure random values approved for security-critical applications. UUIDs are generated locally in your browser with the same randomness quality used for encryption keys and security tokens.
Are UUIDs from this UUID generator truly unique?
UUIDs are statistically unique with collision probability so low it is negligible. A UUID v4 generator uses 122 random bits — the probability of generating two identical UUIDs is 1 in 5.3 quadrillion. You could generate billions of UUIDs before expecting a single collision.