OnlineDeveloperTool
Generators & Hashes

UUID Validator Online

Check whether a string is a correctly formatted UUID.

Updated

This tool runs in your browser. No account or signup is required.

Common UUID Validator tasks

Developers typically reach for this page when they need to check whether a UUID is valid; validate UUID v4 v7 format; inspect UUID version and variant. The tool is built for quick, practical work rather than a generic demo.

What matters in a uuid validator workflow

When developers compare online tools for this job, the useful capabilities tend to center on RFC 9562, version/variant, bulk validation, timestamps. This page keeps those practical needs in mind while linking to related tools when a different workflow is a better fit.

What is UUID Validator?

UUID Validator tests a string against the standard 8-4-4-4-12 hex layout, with a version digit of 1-5 and an RFC 4122 variant.

What problem does it solve?

You need IDs for test data, or you need to know whether an ID from a log or database is well-formed. Doing that by eye does not scale.

How to use UUID Validator

  1. Paste the UUID.
  2. Press the validate button.
  3. Read the result: Valid UUID or Invalid UUID.

Example

Input

123e4567-e89b-12d3-a456-426614174000

Output

Valid UUID

What you can do with UUID Validator

  • Validate a UUID
  • Check GUID format
  • Is this a valid UUID?

Common use cases

  • Seeding test data with unique IDs
  • Checking an ID copied from logs
  • Working out which UUID version a system produces

Related developer tasks

  • Validate a UUID
  • Check GUID format
  • Is this a valid UUID?

What the UUID validator accepts

  • 32 hex digits in the 8-4-4-4-12 layout, upper or lower case.
  • A version digit from 1 to 5 at the start of the third group.
  • A variant digit of 8, 9, a or b at the start of the fourth group.
  • Version 6, 7 and 8 UUIDs and the all-zero nil UUID are reported as invalid by this tool.

UUID validation examples

123e4567-e89b-12d3-a456-426614174000  ->  Valid UUID
123e4567-e89b-62d3-a456-426614174000  ->  Invalid UUID (version digit 6)
123e4567e89b12d3a456426614174000      ->  Invalid UUID (no hyphens)

Related: UUID Parser, UUID Generator, Regex Tester

UUID Validator FAQ

What is a UUID?

A UUID (or GUID) is a 128-bit identifier written as 32 hex digits in five groups, for example 123e4567-e89b-12d3-a456-426614174000.

Which versions does the validator accept?

It accepts the standard layout with a version digit from 1 to 5 and an RFC 4122 variant.

Is my data sent to a server?

The processing runs in your browser, so what you paste into the tool is not uploaded for processing. As with any tool, avoid pasting live secrets you cannot afford to leak.

Why is my UUID v7 reported invalid?

This validator only allows version digits 1 to 5. A version 7 UUID is a valid format elsewhere, but this tool does not accept it.

Looking for something else? Browse all developer tools.

onlinedevelopertool.com is a collection of 54 free, browser-based utilities for the small jobs that interrupt real work: formatting a JSON response, decoding a token, converting a timestamp, generating a UUID or checking a hash. Each tool has its own page with a short explanation, a worked example and answers to common questions, so you can use it and learn what it does at the same time.

There is no account to create and nothing to install. Tools run in your browser, so the text you paste is processed on your own device. The one exception is the Website Status Checker, which sends a request from your browser to the address you enter.

Three steps: paste your input, click the tool, copy the result, all inside your browser
Popular developer utilities: JWT decoder, UUID generator, Base64 decoder, SHA-256 hash, regex tester and timestamp converter

What you can do here

  • JSON Tools

    Format, validate, beautify and minify JSON, generate C#, TypeScript, Java, Python, Go, PHP and Kotlin models from it, or convert between JSON, YAML and CSV.

  • Encoders & Decoders

    URL, Base64 and HTML encoding and decoding, plus a JWT decoder for reading token claims.

  • Generators & Hashes

    Generate UUIDs and JWTs, validate UUIDs, and create MD5, SHA-256 and SHA-512 hashes.

  • Web Tools

    Timestamps, color codes, query strings and cron expressions - the small things web work keeps throwing at you.

  • Text & Data

    Format XML and YAML, count text, change case, make slugs, test regex, diff two texts and convert number bases.

  • Website Checking

    Check whether a website or URL is reachable from your browser.

Quick developer reference

  • JSON

    Keys and strings must use double quotes, and trailing commas and comments are not allowed. Those are the three most common reasons a payload fails to parse.

    Validate JSON

  • JWT

    A JSON Web Token is three Base64URL parts joined by dots: header, payload and signature. Decoding shows the claims but does not prove the token is genuine; only signature verification does.

    Decode a JWT

  • Base64

    Base64 is an encoding, not encryption. Anyone can reverse it, and it makes data roughly one third larger, so never use it to hide secrets.

    Decode Base64

  • UUID

    A version 4 UUID is made of random bits and written as 8-4-4-4-12 hexadecimal characters. Collisions are astronomically unlikely, which is why they work well as identifiers.

    Generate a UUID

  • Timestamps

    A Unix timestamp counts time since 1 January 1970 UTC. Ten digits usually means seconds and thirteen digits usually means milliseconds.

    Convert a timestamp

  • Hashes

    MD5 is fine for quick checksums but is not safe for security. Prefer SHA-256 or SHA-512, and remember that hashing is one-way and is not encryption.

    Create a SHA-256 hash

Missing a tool you need? Visit the contact page and tell us what you reach for most often. You can also browse every tool or read the About page to see how the site is built and what it does with your data.