What is a UUID generator?

A UUID generator creates universally unique identifiers that can be used as primary keys in databases, IDs for API resources, session tokens and other unique references in applications.

What version of UUID does this tool generate?

This tool generates RFC 4122 compliant UUIDv4 values, which are based on high-quality random numbers and are widely used in modern web applications and databases.

Can I generate multiple UUIDs at once?

Yes. You can generate from 1 to 100 UUIDs in a single batch. All UUIDs are listed on separate lines so they can easily be copied into your code, database or configuration files.

Can I customize the UUID format?

Yes. You can choose to include or remove hyphens, switch between lowercase and uppercase, wrap UUIDs in curly braces, or format them as URN strings like urn:uuid:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

Are the generated UUIDs stored on the server?

No. All UUIDs are generated locally in your browser using JavaScript and the Web Crypto API when available. They are not uploaded, stored or logged on our servers.

UUID Generator

Generate RFC 4122 compliant UUIDv4 identifiers directly in your browser. Customize format, generate multiple UUIDs at once, and copy or download them for use in databases, APIs and applications.

How many UUIDs?

Generate between 1 and 100 UUIDs in a single batch. Each UUID appears on its own line.

Format options

Include hyphens Uppercase

Wrap in { } URN format (urn:uuid:)

Hyphens & lowercase are common for databases. URN & braces are useful for some APIs and config files.

Generation engine

Uses crypto.getRandomValues when available for cryptographically strong randomness. Falls back to Math.random if needed.

Generated UUIDs

You can edit this list manually if needed. Validation checks only the first line by default.

Batch Statistics

Generated in last batch 0

Unique in batch 0

Duplicate UUIDs 0

Total characters 0

Session Summary

Total UUIDs this session 0

Approx. size (UTF-8) 0 B

Last action None

Sample UUID (first line)

Looks valid —

Detected version —

Length —

Hyphens present —

Free Online UUID Generator (UUIDv4)

The UUID Generator from PowerSEOTools.online lets you create universally unique identifiers (UUIDs) directly in your browser. UUIDv4 values are based on random numbers and are widely used as IDs in databases, REST APIs, message queues and distributed systems.

What is a UUID?

A UUID (Universally Unique Identifier), also known as a GUID in some systems, is a 128-bit value commonly represented as a 36-character string like 123e4567-e89b-12d3-a456-426614174000. The format comes from the RFC 4122 standard and is designed to be statistically unique across space and time without requiring a central authority.

Why Use UUIDv4?

High uniqueness: Based on cryptographically strong randomness when possible.
Easy to generate: No database calls or central coordination required.
Safe for public IDs: Hard to guess and generally opaque to users.
Works across systems: Supported by most languages, ORMs and databases.

Features of the PowerSEOTools.online UUID Generator

Batch generation: Create up to 100 UUIDs at a time, each on its own line.
Format customization: Toggle hyphens, switch to uppercase, wrap with curly braces, or use URN format.
Crypto-grade randomness: Uses crypto.getRandomValues when available, with graceful fallback.
Validation helper: Quickly check if the first UUID matches the expected RFC 4122 pattern and detect its version.
Session statistics: See how many UUIDs you generated in the current session and approximate size in bytes.
Copy & download: Copy the full list to your clipboard or download it as a .txt file.
Privacy-friendly: All generation happens locally in your browser. Nothing is stored on the server.

Common Use Cases

Primary keys in SQL or NoSQL databases (especially in distributed systems).
Public resource identifiers for REST or GraphQL APIs.
Correlation IDs for logging and tracing microservices.
Session tokens, invitation codes or unique file identifiers.

Use this UUID Generator together with other Developer & Encoding Tools on PowerSEOTools.online to streamline your development workflow.