UUID Generator
Generate universally unique identifiers instantly. Supports v1 (timestamp), v4 (random), and v7 (sortable) UUIDs with bulk generation up to 1,000, format options, and validation.
Version 4: Cryptographically random. Best for most use cases.
UUID Validator
Frequently Asked Questions
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier standardized by RFC 4122. UUIDs are designed to be unique across space and time without requiring a central authority, making them ideal for distributed systems, database primary keys, and session identifiers.
What is the difference between UUID v1, v4, and v7?
UUID v1 is based on timestamp and node (typically MAC address), making it partially sequential and sortable. UUID v4 is entirely random, offering better uniqueness guarantees and no information leakage. UUID v7 (RFC 9562) combines a Unix millisecond timestamp with randomness — it is sortable, database-friendly, and the recommended choice for new systems that need time-ordered IDs.
How unique are UUIDs?
UUID v4 uses 122 random bits, giving approximately 5.3 x 10^36 possible values. The probability of generating a duplicate is astronomically low — you would need to generate about 2.71 x 10^18 UUIDs to have a 50% chance of a single collision.
Is my data safe?
Yes. All UUIDs are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues). No data is sent to any server. The source code runs client-side only.
When should I use UUID v7?
UUID v7 is ideal when you need sortable, time-ordered unique identifiers — for example, database primary keys where insert performance and chronological ordering matter. Defined in RFC 9562 (2024), v7 embeds a Unix millisecond timestamp in the first 48 bits followed by random data.
Can I generate UUIDs in bulk?
Yes. This tool supports generating up to 1,000 UUIDs at once. Select your desired count from the dropdown, click Generate, then use Copy All or Download as Text to export them.