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Last updated: April 12, 2026

Best UUID Generator Online in 2026

Quick Answer

DevToolHQ UUID Generator is the best pick: it generates UUIDs instantly in the browser with support for v1, v4, and v7. No data is sent to any server, and you can generate in bulk.

Rankings

#ToolWhy
#1DevToolHQ UUID GeneratorGenerates v1, v4, and v7 UUIDs entirely client-side with bulk generation and one-click copy.
#2UUIDGenerator.netWell-established site with support for multiple UUID versions and a clean interface.
#3Online UUID GeneratorGood reference site with UUID decoding, validation, and timestamp extraction.

Detailed Breakdown

Generates v1, v4, and v7 UUIDs entirely client-side with bulk generation and one-click copy.

Pros

  • +Client-side generation — cryptographically random
  • +Supports UUID v1, v4, and v7
  • +Bulk generation up to 1000 at once

Cons

  • -No UUID v5 (namespace-based) generation yet

Well-established site with support for multiple UUID versions and a clean interface.

Pros

  • +Supports v1, v3, v4, v5 generation
  • +Nil UUID and GUID options
  • +Educational content about UUID versions

Cons

  • -Contains ads
  • -Server-side generation for some versions

Good reference site with UUID decoding, validation, and timestamp extraction.

Pros

  • +UUID decoder and validator
  • +Timestamp extraction from v1 UUIDs
  • +Clean interface

Cons

  • -Ad-supported
  • -Fewer generation options than UUIDGenerator.net

Tips

  • 1.Use UUID v4 for most applications — it is random and has negligible collision probability.
  • 2.Use UUID v7 for database primary keys — it is time-sortable, which improves index performance.
  • 3.Never use UUID v1 in public-facing IDs — it contains the MAC address of the generating machine.
  • 4.For testing, use a fixed UUID rather than generating fresh ones to make tests deterministic.

Frequently Asked Questions

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