UUID Validator

Paste a UUID or GUID, validate the format, inspect version and variant details, bulk check lists, or generate UUID v4 values in the browser.

Validate one dashed UUID, compact hex string, braced GUID, or urn:uuid value from a copied source.

Bulk check migration lists, seed files, API payloads, or log exports with one UUID per line.

  • Validate UUID format and hyphen layout
  • Inspect version and variant details
  • Bulk check UUID lists in the browser

How to use UUID Validator

Validate a single UUID or switch to bulk mode, then confirm format, version, variant, normalization, and destination requirements before copying the result.

  1. 1

    Paste a UUID or GUID

    Enter a dashed UUID, compact 32-character UUID, braced GUID, or urn:uuid value. The validator trims the input, normalizes accepted formats, and shows whether the value matches the expected UUID structure.

  2. 2

    Review version, variant, and format

    Check the validity result, normalized lowercase output, detected version, variant family, and any unknown version indicator before storing the identifier or using it in an API request.

  3. 3

    Use bulk validation or v4 generation

    Switch to bulk mode for one UUID per line when reviewing a list, or generate up to 100 UUID v4 values when you need fresh random identifiers for testing, seed data, or placeholders.

UUID and GUID format validation

Check the common 8-4-4-4-12 UUID layout, hexadecimal characters, compact UUID strings, braced GUIDs, and urn:uuid input from one field.

Version and variant inspection

The result panel shows detected UUID versions 1 through 5 when available, plus the variant family that determines how the identifier layout should be interpreted.

Bulk UUID validator

Paste a line-by-line list and get a valid count with individual pass or fail markers, making API payloads and migration lists easier to review.

Normalized lowercase output

Valid identifiers are formatted into a consistent lowercase dashed UUID that can be copied into code, database fields, or documentation.

UUID v4 generator

Generate one to 100 UUID v4 values in the same workspace when you need random identifiers after checking existing ones.

Browser-only identifier review

Validation, normalization, bulk checks, and UUID v4 generation happen in the browser without requiring account access or server-side storage.

UUID Validator privacy and processing

UUID Validator explains browser handling, storage expectations, account access, browser-only identifier limits, and destination checks before validated or generated UUIDs are reused.

Browser UUID validation

UUID Validator checks UUID or GUID text in the browser, normalizes accepted formats, and shows validity, version, variant, and formatted output on the page.

No server storage

Normal UUID Validator use does not create a stored server copy of pasted identifiers, generated UUIDs, or bulk validation lists.

UUID Validator account access

UUID Validator runs without sign-in, so format checks and UUID v4 generation can be completed without a saved profile.

Before You Use UUID Validator

Review these notes before trusting a UUID from logs, database exports, API payloads, support tickets, test data, or security-sensitive workflows.

Privacy

Paste only the identifiers needed for the current check, especially if UUIDs can reveal customer records, internal resources, or private environments.

Generated UUIDs and pasted UUID lists stay in the browser during normal use, but sensitive identifiers should still be cleared after review.

Accuracy

A valid UUID format does not prove that the identifier exists in your database, belongs to the right tenant, or is safe to expose publicly.

Newer UUID version nibbles can be format-valid while showing an unknown version in this tool, so check your target system when version-specific behavior matters.

Compatibility

Some systems accept compact UUIDs, braced GUIDs, uppercase UUIDs, or urn:uuid values, while others require lowercase dashed strings.

If a value was copied from JSON, SQL, logs, or a URL, remove quotes, commas, query text, and labels before judging the UUID itself.

Output

Copy the normalized UUID only after confirming the destination wants the dashed format and the expected UUID version.

Use generated UUID v4 values for placeholders, tests, or seed data, not as proof that an identifier already exists in production.

Limits

UUID Validator reviews single UUID values and line-by-line UUID lists in the active browser workspace; very long pasted lists may slow validation or result rendering.

Questions about UUID Validator

What UUID formats can this validator read?

It can validate dashed UUIDs, compact 32-character hexadecimal UUIDs, braced GUID values, and urn:uuid values, then show a normalized lowercase dashed result when valid.

Does UUID validation prove the ID exists?

No. UUID Validator checks format, version, variant, and normalization details. It cannot confirm whether the identifier exists in your database or belongs to the right record.

Can UUID Validator check a list of UUIDs?

Yes. Bulk Validate accepts one UUID per line and shows the number of valid identifiers plus individual result markers for each pasted line.

Can I generate UUIDs here too?

Yes. The generator creates UUID v4 values and can produce up to 100 at a time for testing, seed data, fixtures, placeholders, or local development.

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