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UUID Generator

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About UUID v4

Format8-4-4-4-12 hex characters
Version bits4xxx in the 3rd group
Variant bits8, 9, a, or b in 4th group
Uniqueness~5.3 × 10³⁶ possible values
Entropy122 bits of randomness
CollisionsExtremely unlikely in practice

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About UUID Generator

UUID Generator produces universally unique identifiers in multiple standard versions, including v1, v4, and v7. These 128-bit values are essential for database primary keys, distributed systems, message queues, and anywhere collision-free identifiers are needed. Generate single or bulk UUIDs instantly in your browser with no external dependencies.

Key Features

  • Support for UUID v1 (timestamp-based), v4 (random), and v7 (time-ordered random)
  • Bulk generation of up to 1000 UUIDs in a single operation
  • Output in standard, uppercase, or braces-wrapped formats
  • Option to remove hyphens for compact storage in databases
  • One-click copy of individual UUIDs or the entire batch
  • Nil UUID and namespace UUID reference values for developer convenience

How to Use UUID Generator

  1. 1

    Choose the UUID version

    Select v4 for general-purpose random identifiers, v1 for timestamp-embedded IDs, or v7 for modern time-sortable identifiers.

  2. 2

    Set the quantity

    Enter how many UUIDs you need. You can generate anywhere from one to a thousand in a single batch.

  3. 3

    Configure formatting options

    Choose whether to include hyphens, use uppercase letters, or wrap each UUID in braces depending on your target system's requirements.

  4. 4

    Generate and review

    Click Generate to produce the UUIDs. Each one is displayed in a list for easy scanning and selection.

  5. 5

    Copy the results

    Copy a single UUID by clicking it, or use the Copy All button to grab the full batch as a newline-separated list.

Common Use Cases

Database Primary Keys

Use v4 or v7 UUIDs as primary keys in PostgreSQL, MySQL, or MongoDB to avoid sequential ID enumeration and simplify data merging across shards.

Distributed System Correlation

Assign a UUID to each request or transaction so it can be traced across microservices, message brokers, and log aggregation systems without collisions.

Test Data Generation

Quickly produce hundreds of unique identifiers to populate mock databases, seed integration tests, or simulate realistic multi-tenant data sets.

File and Asset Naming

Name uploaded files, media assets, or temporary resources with UUIDs to prevent naming collisions in shared storage buckets.

Why Use Our UUID Generator

This tool supports v1, v4, and the modern v7 UUID format in one place, with batch generation of up to 1,000 IDs and flexible output formatting. No sign-up or API key is needed — just instant, browser-based generation with one-click copy. It is ideal for developers who need bulk UUIDs for database seeding, testing, or distributed systems without leaving the browser.

Zero-Knowledge UUID Generation

All UUIDs are generated entirely within your browser using local cryptographic randomness. No identifiers are sent to or recorded on any server. Your generated IDs remain completely private, ensuring no one can predict or catalog the keys you use in your systems.

Frequently Asked Questions

What is the difference between UUID v4 and v7?
UUID v4 is entirely random, offering maximum unpredictability. UUID v7 embeds a Unix timestamp in the first 48 bits, making the IDs naturally sortable by creation time while still containing enough randomness to prevent collisions.
Can two generated UUIDs ever collide?
It is theoretically possible but astronomically unlikely. The probability of a v4 collision after generating one billion UUIDs is roughly one in 2.7 quintillion, making it safe for virtually any practical application.
Should I remove the hyphens from my UUIDs?
Hyphens are optional formatting. Removing them saves four bytes of storage per ID and can simplify URL construction, but most databases and libraries handle both formats interchangeably.

Last updated: April 6, 2026