GUID/UUID Generator
Generate globally unique identifiers with customizable formats and versions.
Choose the UUID/GUID version to generate
Choose how to format the generated GUIDs
Number of GUIDs to generate at once
Convert GUIDs to uppercase letters
About GUIDs/UUIDs
GUIDs (Globally Unique Identifiers) are 128-bit values used to uniquely identify information. They're virtually guaranteed to be unique across all systems.
No GUIDs Generated Yet
Click the "Generate GUIDs" button to create unique identifiers. All generated GUIDs will appear here.
Understanding GUIDs and UUIDs
What is a GUID/UUID?
- Globally Unique Identifier: A 128-bit number used to uniquely identify information
- UUID Standard: Standardized by RFC 4122 for interoperability across systems
- Uniqueness: Practically guaranteed to be unique without central coordination
- Common Uses: Database keys, session IDs, distributed systems, and file naming
- Format: Typically displayed as 32 hexadecimal digits in groups (8-4-4-4-12)
GUID Versions Explained
- Version 4: Random generation, most commonly used, cryptographically secure
- Version 1: Timestamp-based with MAC address, contains temporal information
- Version 7: Sortable timestamp-based, newest standard, ideal for databases
- Different formats available: hyphenated, braces, parentheses, or Base64
- Case-insensitive but can be displayed in uppercase or lowercase
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