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PowerUtils
2026-06-11•2 分鐘閱讀

如何免費線上生成 UUID

學習如何使用 PowerUtils 免費線上 UUID 生成器生成 RFC 4122 標準 UUID（版本 4）。適合資料庫主鍵、API 識別碼和會話令牌。

uuiddevelopergeneratortutorial

What is a UUID?



A UUID (Universally Unique Identifier) is a 128-bit number used to identify information in computer systems. Version 4 UUIDs are randomly generated and have an extremely low probability of collision.

UUID Format



A standard UUID looks like:
``
550e8400-e29b-41d4-a716-446655440000
``

  • 32 hexadecimal characters

  • Grouped as 8-4-4-4-12

  • 122 bits of randomness

  • Probability of duplicate: ~1 in 2^122


    • Common Use Cases



  • Database Primary Keys: Unique record identifiers

  • API Resource IDs: Identify resources in REST APIs

  • Session Tokens: Track user sessions securely

  • File Names: Generate unique file identifiers

  • Transaction IDs: Track financial transactions


    • How to Use the UUID Generator



    Step 1: Generate



    Go to the UUID Generator and click the generate button.

    Step 2: Customize (Optional)



  • Quantity: Generate multiple UUIDs at once

  • Format: Choose with or without hyphens

  • Case: Uppercase or lowercase


    • Step 3: Copy



    Copy individual UUIDs or download all as a text file.

    Why Use UUIDs?



  • Distributed Systems: No central authority needed

  • Privacy: No sequential pattern to guess

  • Scalability: Generate IDs independently

  • Standardization: RFC 4122 compliant


    • Related Tools



  • Hash Generator - Generate MD5, SHA hashes

  • Password Generator - Create secure passwords

  • Base64 Encoder - Encode UUIDs for URLs


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