UUID validator

Client

Paste one UUID per line to check hyphenated hex shape, version nibble, and RFC 4122 variant—pairs with the UUID generator for fixture QA.

How to use

Paste UUIDs one per line; read ✓/✗ per row.

About UUID validator

Validate UUID and GUID strings: version, RFC 4122 variant, bulk paste—browser-only, no upload. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

550e8400-e29b-41d4-a716-446655440000  ✓ v4 RFC4122
not-a-uuid  ✗ Expected 8-4-4-4-12 hex with hyphens.

Nearby workflows on Toolcore

  • UUID / GUID generator — Random UUID v4 values—batch generate, copy, uppercase GUID style, local only. when another identifier column uses a different checksum ruleset.
  • UUID v7 generator — Time-ordered UUIDs (RFC 9562)—48-bit Unix ms plus randomness; lexicographic sort by mint time, batch copy, local only. when another identifier column uses a different checksum ruleset.
  • ULID generator — Sortable identifiers with millisecond timestamp—batch generate and copy locally. when another identifier column uses a different checksum ruleset.
  • Nano ID generator — URL-safe Nano IDs—adjust length, batch generate and copy locally. when another identifier column uses a different checksum ruleset.

Common use cases

  • Validate API fixture ids before importing JSON.
  • Bulk-check spreadsheet GUID columns locally.

Common mistakes to avoid

  • Assuming valid format means the record exists

    This checks string math only—not database or registry lookup.

FAQ

Which UUID versions are accepted?

Version nibble 1–8 with RFC 4122 variant (8, 9, a, b).

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • uuid validator online
  • check guid format in browser
  • validate uuid v4 variant rfc 4122

More tools

Related utilities you can open in another tab—mostly client-side.