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UUID Generator
Generate various versions of UUIDs with multiple formats and configuration options.
UUID Generator - Generation Options
UUID Generator Tool Guide
UUID Generator is a free online tool that can quickly generate various versions of UUIDs (Universally Unique Identifiers). Supports UUID v1 (timestamp-based), v4 (random), v5 (namespace-based) and other versions. Supports multiple formats (standard format, uppercase, lowercase, no hyphens, braces, brackets), supports batch generation (up to 1000), supports custom namespaces and names (v5 version). All UUID generation is done locally in your browser, data is never uploaded to the server, completely protecting your privacy and data security.
Multiple UUID versions for various needs
100% local generation, privacy secure
Batch generation with multiple formats
Tool Features
Multiple UUID Version Support
Supports three main UUID versions: UUID v1 (timestamp-based): Generated using MAC address and timestamp, ensures uniqueness and time ordering. UUID v4 (random): Completely random generation, most commonly used, suitable for most scenarios. UUID v5 (namespace-based): Generated using namespace (DNS, URL, OID, X.500) and name to create deterministic UUIDs, same input generates same UUID. Each version has specific use cases, you can choose the appropriate version based on your needs.
Flexible Formats and Batch Generation
Supports multiple UUID formats: standard format (with hyphens), uppercase format, lowercase format, no hyphens format, braces format, brackets format. Supports batch generation, can generate 1 to 1000 UUIDs at once, greatly improving efficiency. All generated UUIDs are displayed in a list, can be copied individually or in batch. Supports append generation, can continue generating more UUIDs based on existing list.
Detailed Statistics and Convenient Operations
Provides detailed statistics including total generated, UUID version, average length, unique count, etc. Statistics are displayed in colorful cards, clear and intuitive. Supports one-click copy of single UUID or batch copy of all UUIDs, convenient for using results elsewhere. Supports clear function to quickly reset all generated UUIDs. All operations take effect in real-time, can regenerate after modifying options.
How to Use
- 1
Select UUID Version and Format
In the generation options area, select UUID version (v1, v4, v5) and format (standard, uppercase, lowercase, no hyphens, braces, brackets). If selecting v5 version, you need to configure namespace (DNS, URL, OID, X.500 or custom) and name. Enter generation quantity (1-1000), then click the "Generate" button.
- 2
View Generated UUIDs
After generation is complete, all UUIDs will be displayed in the list, each UUID on one line. You can view the statistics cards to see total generated, version, average length, unique count, etc. Each UUID has a "Copy" button next to it for quick copying of a single UUID.
- 3
Copy and Manage UUIDs
You can click the "Copy All" button to batch copy all UUIDs, or click the "Copy" button next to a single UUID to copy a single UUID. If you need more UUIDs, you can click the "Generate More" button to append generation based on the existing list. You can click the "Clear" button to clear all generated UUIDs and start over.
Frequently Asked Questions
What's the difference between UUID v1, v4, and v5?
UUID v1 (timestamp-based): Generated using MAC address and timestamp, ensures uniqueness and time ordering, suitable for scenarios requiring time ordering. UUID v4 (random): Completely random generation, most commonly used, suitable for most scenarios such as database primary keys, session IDs, etc. UUID v5 (namespace-based): Generated using namespace and name to create deterministic UUIDs, same namespace and name always generate the same UUID, suitable for scenarios requiring repeatable generation.
How many UUIDs can I generate?
The tool supports batch generation, you can generate 1 to 1000 UUIDs at a time. If you need more, you can use the "Generate More" function to append generation based on the existing list. All generated UUIDs are saved in the list until you click the "Clear" button.
Are the generated UUIDs unique?
Yes, each generated UUID is unique. UUID v4 uses cryptographically secure random number generator, theoretically collision probability is extremely low (almost 0). UUID v1 is based on timestamp and MAC address, also ensures uniqueness. UUID v5 is based on namespace and name, same input generates same UUID, but different inputs generate unique UUIDs. The tool will count and display unique count to ensure generated UUIDs are not duplicated.
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