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UUID v4 Generator

Generate unique UUIDs, validate format, and bulk-generate for your applications.

Number of UUIDs (1-100)

Validate UUID

Paste a string to check if it is a valid UUID

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier that is practically unique across all systems. UUID v4 is randomly generated using cryptographically secure random numbers, making collisions effectively impossible.

How to Use This Tool

  • Set the count (1-100) and click Generate for bulk UUID creation
  • Each UUID has a visible Copy button for quick access
  • Use the Validate field to check if a string is a valid UUID format
  • Download all UUIDs as a text file for batch import

Common Use Cases

  • Database primary keys in distributed systems
  • Unique identifiers for API resources
  • Session IDs and correlation IDs for logging
  • File naming to avoid conflicts

Tips

  • UUID v4 uses crypto.randomUUID() for cryptographic randomness
  • For database indexing, consider UUID v7 (time-ordered) for better B-tree performance
  • The standard format is 8-4-4-4-12 hex characters (36 chars total)

FAQs

What is the difference between UUID v1, v4, and v5?

UUID v1 is based on timestamp and MAC address (can leak information). UUID v4 is randomly generated (most common). UUID v5 is deterministic — generated from a namespace and name using SHA-1, so the same inputs always produce the same UUID.

What is the probability of a UUID v4 collision?

Extremely low. With 122 random bits, you would need to generate about 2.71 quintillion (2.71 x 10^18) UUIDs to have a 50% chance of one collision. For practical purposes, UUID v4 collisions are effectively impossible.

How do I validate a UUID format?

A valid UUID has the format xxxxxxxx-xxxx-Mxxx-Nxxx-xxxxxxxxxxxx where x is a hex digit, M is the version (1-5), and N starts with 8, 9, a, or b (variant bits). This tool includes a validation feature to check any string.

Are UUIDs good for database primary keys?

UUIDs work well as primary keys in distributed systems where auto-increment is impractical. However, random UUIDs (v4) can cause index fragmentation in B-tree indexes. Consider UUID v7 (time-ordered) for better database performance.

What is the standard UUID format?

The standard format is 8-4-4-4-12 hex characters with hyphens: 550e8400-e29b-41d4-a716-446655440000. This is 36 characters (32 hex + 4 hyphens) representing 128 bits.

Is Free UUID Generator Online — v4 Random, Bulk Generation & Validation free to use?

Free UUID Generator Online — v4 Random, Bulk Generation & Validation is completely free and runs in your browser.

Does Free UUID Generator Online — v4 Random, Bulk Generation & Validation send my data to a server?

No. Free UUID Generator Online — v4 Random, Bulk Generation & Validation processes input directly in your browser.

Do I need to create an account to use Free UUID Generator Online — v4 Random, Bulk Generation & Validation?

No account is required to use Free UUID Generator Online — v4 Random, Bulk Generation & Validation.

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