UUID Validator

UUID Validator is a free online tool that validate UUID format, detect version (v1-v5), and generate new UUIDs. Bulk validate multiple UUIDs at once. Process data securely in your browser with no information transmitted to external servers.

UUID Validator workspace and controls

Generate UUIDs

What is UUID Validator | Rune

UUID Validator checks whether a string is a valid UUID (Universally Unique Identifier) and identifies its version (v1 through v5) and variant. It accepts standard formatted UUIDs, GUIDs with curly braces, UUIDs without dashes, and urn:uuid: prefixed strings.

Includes bulk validation for checking multiple UUIDs at once and a generator that creates random v4 UUIDs. Useful for developers working with databases, APIs, and distributed systems.

v1-v5
Detection
Bulk
Validation
v4
Generator
Free
Forever

Why Choose UUID Validator on Rune

UUID Validator on Rune handles format validation and version detection in a focused browser workspace. UUID Validator handles routine input directly in your browser when the workflow does not need sharing, sync, remote lookup, or external conversion. Open the page, finish the task, and copy or download the result without installing software.

UUID Validator is designed around the practical result people came for. Validates UUID format with support for standard, no-dash, curly-brace, and urn:uuid: formats. That alone saves time for anyone who needs quick, reliable results on a daily basis.

Key Features of UUID Validator

From format validation to client-side only, everything packed into one tool

Format Validation

Validates UUID format with support for standard, no-dash, curly-brace, and urn:uuid: formats.

Version Detection

Identifies UUID version (v1 time-based, v3 MD5, v4 random, v5 SHA-1) and variant (RFC 4122, NCS, Microsoft).

Bulk Validation

Paste multiple UUIDs to validate them all at once with per-line results and a validity summary.

UUID Generator

Generate 1-100 cryptographically random v4 UUIDs using the Web Crypto API.

Copy Results

Copy individual UUIDs or all generated UUIDs to clipboard with one click.

Client-Side Only

All validation and generation happens in your browser. No data is sent to any server.

Key Advantages of UUID Validator

No installation required

UUID Validator opens in your browser. There is nothing to download or configure before you start the core workflow.

Format Validation

Validates UUID format with support for standard, no-dash, curly-brace, and urn:uuid: formats. This feature is available for free with no usage limits on the standard tier.

Browser-based processing

UUID Validator handles local input in your browser, so routine work stays on your device without extra setup.

Mobile and desktop ready

UUID Validator works on any screen size. The interface adapts to phones, tablets, and desktops so you can use it wherever you are.

No account needed for core use

Use the core UUID Validator workflow without creating an account or providing an email address.

Free with no hidden costs

UUID Validator is completely free on the standard tier. There are no trial periods, no watermarks on output, and no surprise paywalls after you start using it.

Who Benefits from UUID Validator

UUID Validator fits into a wide range of workflows. Here is how different users put it to work.

Students and Academics
Use UUID Validator for assignments, research papers, and coursework. Validates UUID format with support for standard, no-dash, curly-brace, and urn:uuid: formats.
Professionals and Teams
Integrate UUID Validator into your daily workflow for faster turnaround on routine tasks. Identifies UUID version (v1 time-based, v3 MD5, v4 random, v5 SHA-1) and variant (RFC 4122, NCS, Microsoft).
Content Creators and Freelancers
Speed up your creative process with UUID Validator. Paste multiple UUIDs to validate them all at once with per-line results and a validity summary.
Developers and Technical Users
Add UUID Validator to your toolkit for quick utility tasks between coding sessions. Generate 1-100 cryptographically random v4 UUIDs using the Web Crypto API.

How to Use UUID Validator

Start using UUID Validator in 3 quick steps

01

Enter UUID

Paste a UUID to validate, or switch to bulk mode to check multiple UUIDs at once.

02

View Results

See if the UUID is valid, its version, variant, and normalized format instantly.

03

Generate New

Use the generator to create new v4 UUIDs and copy them for use in your project.

Rune pro tipsPro Tips

  • UUID v4 (random) is the most commonly used version. It provides 122 bits of randomness with negligible collision probability.
  • UUIDs are case-insensitive, '550E8400' and '550e8400' represent the same UUID.
  • The version is encoded in the 13th hex digit (first digit of the third group) of the UUID.
  • For database primary keys, v4 UUIDs work well but consider v7 (time-ordered) for better index performance.

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Frequently Asked Questions

Common questions about UUID Validator, answered below

Why is my UUID invalid?

Common issues include missing hex characters, misplaced dashes, unsupported prefixes, invalid version digits, or characters outside 0-9 and a-f.

What are the different UUID versions?

v1: Time + MAC address. v2: DCE Security. v3: MD5 hash of namespace+name. v4: Random. v5: SHA-1 hash of namespace+name. v4 is the most commonly used.

Is UUID the same as GUID?

Yes, essentially. GUID (Globally Unique Identifier) is Microsoft's term for UUID. They follow the same RFC 4122 standard and are interchangeable.

Can this tool detect the UUID version?

Yes. The tool identifies the version (v1-v5) from the version nibble and the variant from the variant bits in the UUID.

What formats are supported?

Standard (8-4-4-4-12), no dashes (32 hex chars), curly braces ({...}), and urn:uuid: prefix. All are automatically normalized.

How many UUIDs can I generate at once?

Up to 100 UUIDs at a time. All are generated using crypto.randomUUID() which provides cryptographically secure random v4 UUIDs.

Can I use generated UUIDs as secrets?

No. UUIDs are identifiers, not passwords or API secrets. Use a dedicated secret generator for credentials.

Can two UUIDs ever be the same?

Theoretically yes, but the probability is astronomically low. A v4 UUID has 2^122 possible values, you'd need to generate billions per second for centuries to have a meaningful chance of collision.

Still need help?

Can't find what you're looking for? Our support team is here to assist you.

Contact Support

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