UUID Generator

Generate universally unique identifiers instantly.

100% client-side. Your data never leaves your browser.

Click "Generate" to create UUIDs...

About UUID Versions

UUID v4 (Random)

Cryptographically random. Most commonly used. Best for general-purpose unique IDs.

UUID v1 (Timestamp)

Time-based with node ID. Contains creation timestamp. Useful for time-ordered IDs.

UUID v7 (Sortable)

New standard. Unix timestamp prefix makes it sortable. Great for database primary keys.

ULID

26-char, case-insensitive, lexicographically sortable. URL-safe alternative to UUID.

100%

Client-Side

All processing happens in your browser. Your data never touches our servers.

Free

No Signup

Use unlimited times without creating an account. No ads, no tracking.

Fast

Instant Results

Generate hundreds of UUIDs instantly with bulk generation support.

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Frequently Asked Questions

What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that is unique across space and time. UUIDs are commonly used in databases, APIs, and distributed systems to identify resources without requiring a central authority to ensure uniqueness. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
What's the difference between UUID v1 and UUID v4?
UUID v1 is timestamp-based, incorporating the current time and a node identifier (typically a MAC address simulation). This makes v1 UUIDs roughly sortable by creation time but potentially reveals information about when they were created. UUID v4 is randomly generated using cryptographically secure random numbers, providing better privacy and unpredictability. V4 is the most commonly used version for general-purpose unique identifiers.
What is a ULID and when should I use it?
A ULID (Universally Unique Lexicographically Sortable Identifier) is a 26-character identifier that combines a 48-bit timestamp with 80 bits of randomness. Unlike UUIDs, ULIDs are case-insensitive, URL-safe, and lexicographically sortable by creation time. Use ULIDs when you need IDs that can be sorted chronologically, such as for database primary keys where insertion order matters, or when you need shorter, more URL-friendly identifiers.
Are generated UUIDs truly unique?
Yes, for all practical purposes. UUID v4 uses 122 random bits, making the probability of generating duplicate UUIDs astronomically small (about 1 in 5.3 × 10^36). You would need to generate 1 billion UUIDs per second for about 85 years to have a 50% chance of a collision. This makes UUIDs suitable for virtually any application requiring unique identifiers.
Is this tool free and secure?
Yes, this UUID generator is completely free with no signup required. All UUID generation happens entirely in your browser using JavaScript - no data is sent to any server. This makes it completely safe and private for generating identifiers for any purpose, including sensitive applications.