Home/Tools/UUID Generator
CompareArrayJSONTextCSV
UtilitiesFormatterBase64URL EncodeJWT
GenerateRegexUUIDHashTimestampYAML↔JSON

UUID Generator

Generate random UUIDs (v4) individually or in bulk. Validate UUID format instantly.

Your data stays in your browser — nothing is uploaded to any server.

or try sample data

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit number used to uniquely identify resources in distributed systems. Version 4 UUIDs are randomly generated using cryptographically secure random numbers, making collisions practically impossible.

  • UUID v4 — generated using cryptographic randomness via the Web Crypto API.
  • Bulk generation — generate up to 500 UUIDs at once.
  • Validation — check whether a string is a valid UUID (versions 1-5).
  • Uppercase option — output UUIDs in uppercase if your system requires it.
  • Privacy-first — all generation happens in your browser using secure random sources.

Frequently Asked Questions

How do I generate a UUID online?

Click the Generate button to instantly create a new UUID (Universally Unique Identifier). You can generate single UUIDs or bulk-generate multiple UUIDs at once. Each UUID is created using your browser's cryptographic random number generator.

What is a UUID?

A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in five groups separated by hyphens (e.g., 550e8400-e29b-41d4-a716-446655440000). UUIDs are used as database primary keys, session IDs, transaction IDs, and anywhere a globally unique identifier is needed.

What is the difference between UUID v1 and UUID v4?

UUID v1 is generated from the current timestamp and the device's MAC address, making it sortable by time but potentially revealing device identity. UUID v4 is generated from random numbers and is the most widely used version — it provides strong uniqueness guarantees without exposing any information about when or where it was created.

Is my data safe when generating UUIDs here?

Yes. UUIDs are generated entirely in your browser using the Web Crypto API (crypto.getRandomValues), which provides cryptographically secure random numbers. No data is sent to any server.

How unique are UUIDs? Can they collide?

UUID v4 has 122 random bits, giving approximately 5.3 x 10^36 possible values. The probability of generating two identical UUIDs is astronomically low — you would need to generate about 2.7 billion UUIDs per second for 100 years to have a 50% chance of a single collision.

Can I generate UUIDs in bulk?

Yes. Specify the number of UUIDs you need and click Generate. The tool creates them all instantly in your browser. You can copy the results to your clipboard for use in scripts, databases, or test data.