UUID Generator & Validator
generate and validate uuids (v1, v3, v4, v5). bulk generation, multiple formats, and detailed analysis. perfect for developers.
uuid generation
Cryptographically random UUIDs • General purpose, most common
Example: f47ac10b-58cc-4372-a567-0e02b2c3d479
Use the options above to customize UUID generation
Quick Refs
How to Generate UUIDs
- 1
Select the UUID version
Choose from UUID v1 (timestamp-based), v3 (MD5 namespace), v4 (random), v5 (SHA-1 namespace), or nil UUID depending on your requirements.
- 2
Set the quantity
Generate a single UUID for quick use or bulk-generate up to 1,000 UUIDs at once for database seeding, test fixtures, or migration scripts.
- 3
Choose the output format
Pick standard hyphenated format, no-hyphens, uppercase, braces-wrapped (Microsoft GUID style), or C struct format to match your project requirements.
- 4
Copy or export
Copy individual UUIDs with one click, or copy the entire batch as a newline-separated list ready to paste into your code, SQL inserts, or CSV files.
Key Features
Multiple UUID Versions
Generate v1 (timestamp), v3 (MD5 namespace), v4 (cryptographically random), v5 (SHA-1 namespace), and nil UUIDs to suit different architectural needs.
Bulk Generation
Create up to 1,000 UUIDs in a single batch, perfect for populating test databases, generating fixture data, or scripting migrations.
Format Conversion
Output UUIDs in standard, no-hyphens, uppercase, braces (GUID), or C struct format without manual string manipulation.
UUID Validation & Analysis
Paste any UUID to validate its format, detect the version, and extract embedded information like the timestamp from v1 UUIDs.
Cryptographic Randomness
V4 UUIDs use the Web Crypto API for true cryptographic randomness, ensuring collision resistance suitable for production systems.
When to Use a UUID Generator
UUIDs are the standard for generating unique identifiers in distributed systems where auto-incrementing integers are impractical. Microservices, event-driven architectures, and multi-region databases all rely on UUIDs to avoid ID collisions without central coordination. This tool lets you generate production-quality UUIDs instantly without writing code or installing libraries.
During development, you frequently need sample UUIDs for API testing, mock data, database seeds, and documentation examples. Bulk generation saves time when you need hundreds of unique IDs for load testing or fixture files. The validation feature is equally useful for debugging—paste a UUID from a log or error message to confirm its version, format, and embedded metadata.
Choosing the right UUID version matters. Use v4 for general-purpose random IDs, v1 when you need time-ordered identifiers for chronological sorting, and v5 when you need deterministic IDs derived from a namespace and input string (such as generating consistent IDs from URLs or email addresses).
Frequently Asked Questions
What is the difference between UUID v1 and v4?
UUID v1 combines a timestamp with a node identifier (typically a MAC address), producing time-ordered IDs. UUID v4 is generated from cryptographic random numbers with no embedded information. V4 is the most common choice for general-purpose unique identifiers because it has no privacy concerns from embedded hardware addresses.
Are the generated UUIDs truly unique?
V4 UUIDs contain 122 bits of randomness generated via the Web Crypto API. The probability of a collision is astronomically low—you would need to generate about 2.7 quintillion UUIDs to have a 50% chance of a single duplicate. They are safe for production use in databases and distributed systems.
Can I validate an existing UUID?
Yes. Paste any UUID into the validation panel to check its format, detect the version (v1 through v5), and view embedded data. For v1 UUIDs, the tool extracts and displays the encoded timestamp and node identifier.
What is UUID v5 used for?
UUID v5 generates a deterministic ID from a namespace UUID and an input string using SHA-1 hashing. This means the same namespace plus the same input always produces the same UUID. It is useful for creating consistent identifiers from URLs, domain names, or email addresses across distributed systems.
Is the data processed on a server?
No. All UUID generation and validation runs entirely in your browser using JavaScript and the Web Crypto API. Nothing is sent to a server, so the tool is safe to use in environments with strict data handling policies.
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Convert timestamps embedded in v1 UUIDs or correlate UUID creation times with Unix epoch values.
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Generate cryptographically secure passwords alongside your UUIDs for complete test account setup.