UUID Generator
Generate UUIDs, GUIDs, and random tokens. Secure, cryptographically random IDs in your browser.
Quick Generate UUID v4
⚙️ Generator Options
📋 Generated IDs
✨ Features
Cryptographically Secure
Uses crypto.getRandomValues() for security
Multiple Formats
UUID v4, v1, alphanumeric, hex, numeric
Bulk Generation
Generate up to 100 IDs at once
Custom Length
Control token length from 4 to 128 chars
One-Click Copy
Copy individual or all IDs instantly
100% Private
Generated entirely in your browser
📖 UUID Format Reference
UUID v4 (Random)
xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
Version 4 UUIDs use random numbers. The version (4) is fixed in position 13. Most commonly used for generating unique identifiers.
UUID v1 (Timestamp)
xxxxxxxx-xxxx-1xxx-yxxx-xxxxxxxxxxxx
Version 1 UUIDs are based on timestamp and node identifier. Sortable by creation time but may reveal when generated.
Format Breakdown
Total: 32 hexadecimal characters + 4 hyphens = 36 characters
Frequently Asked Questions
A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify information. The probability of generating duplicate UUIDs is astronomically low, making them ideal for distributed systems.
UUID v1 uses the current timestamp and MAC address, making it sequential but potentially revealing device info. UUID v4 is completely random, offering better privacy and unpredictability.
Yes, our UUID v4 and random tokens use the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers suitable for security-sensitive applications.
Common uses include database primary keys, session identifiers, API keys, file naming, distributed system coordination, and anywhere you need guaranteed unique identifiers.
Yes, you can generate up to 100 UUIDs or tokens at once. You can also customize the format, case, and add/remove hyphens based on your needs.
Free Online UUID and GUID Generator
Generate universally unique identifiers (UUIDs) and globally unique identifiers (GUIDs) instantly in your browser. Our generator uses cryptographically secure random number generation to create IDs that are virtually guaranteed to be unique across all systems worldwide.
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit identifier that's designed to be unique across all space and time. The standard format is 32 hexadecimal digits displayed in five groups separated by hyphens, like: 550e8400-e29b-41d4-a716-446655440000.
UUID Versions
UUID version 4 (random) is the most commonly used, generating identifiers from random or pseudo-random numbers. Version 1 incorporates the timestamp and MAC address, making UUIDs sortable by creation time but potentially revealing when and where they were generated.
Security and Randomness
Our generator uses the Web Crypto API's getRandomValues() function, providing cryptographically strong random values suitable for security-sensitive applications like session tokens, API keys, and authentication identifiers.