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UUID Validator

Validate UUIDs online to check format, version and variant before storing or using them in your systems.

uuidvalidate

Formatting Options

Preview the shared config renderer across simple, choice-based, and multi-select settings.
Accepted versions

Choose which UUID versions the validator should treat as valid.

Allow braces

Accept UUID values wrapped in curly braces.

Allow URN prefix

Accept values that begin with urn:uuid:.

Overview

Is that string a valid UUID? Malformed identifiers break databases and APIs. Uuid validator checks format, version, and variant against RFC 4122. Validate uuid online, check uuid format, uuid version checker. Guid validator for debugging identifiers from external services or user input. Verify before you store. Validation runs locally.

Features

  • UUID Validation

    Check whether a value actually follows UUID structure rules

  • Version And Variant Checks

    Inspect the parts that determine UUID compatibility

  • Input Debugging

    Catch malformed identifiers before they reach databases or APIs

  • Privacy First

    All processing happens in your browser

Quick Tips
  • •Validate external UUIDs before storing them or using them as lookup keys
  • •Check version and variant when interoperability matters across systems
  • •Use UUIDs for identifiers, not for secrets or authentication tokens
  • •All data stays in your browser - nothing is sent to servers

When this tool helps

Practical situations where this tool is worth opening.
  • Checking whether user input or partner API data contains a real UUID.
  • Validating identifiers before they become database keys or route parameters.
  • Confirming version and variant information during a migration or integration.

Common mistakes to avoid

A few easy ways these workflows go wrong in practice.
  • Assuming any 36-character string with hyphens is a valid UUID.
  • Accepting identifiers from external systems without validating format first.
  • Using UUIDs as secrets or proof of authorization instead of as identifiers.

Worked examples

Short examples that show what this tool is useful for.
Valid canonical UUID

Input

550e8400-e29b-41d4-a716-446655440000

Output

Valid UUID, version 4, RFC-compliant variant.

Validation is useful before saving an identifier or passing it downstream.

Malformed input

Input

550e8400-e29b-41d4-a716-invalid000000

Output

Invalid UUID because non-hexadecimal characters are present.

Reject malformed values before they create harder-to-debug failures later.

FAQ

Clarifications people often need before using the output.

Related guides

Original reading that explains the workflow around this tool.
UUID Best Practices For APIs, Databases, And Logs
Use UUIDs well in distributed systems, test fixtures, and debugging workflows without confusing identifiers for secrets.

5 min read

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