UUID Generator | UUID v4 Batch Creator
Generate one or many UUID v4 identifiers with optional hyphens, uppercase formatting, or braces for databases, APIs, and test data.
Generated UUIDs
Generate UUID v4 Identifiers
Create random UUID v4 identifiers in single or batch mode for database keys, API objects, test records, fixtures, and development workflows.
Choose the Format Your System Expects
Some systems need lowercase UUIDs with hyphens, while others accept uppercase, braces, or compact values. Match the expected format before copying.
When UUID Generation Helps
Use it for sample IDs, database seed data, API testing, object identifiers, temporary records, and development tasks that need unique-looking values.
About This Tool
UUID Generator creates universally unique identifiers in standard v4 (random) format. UUIDs are used as primary keys in databases, unique identifiers in APIs, session tokens, and anywhere a collision-resistant identifier is needed without a central authority.
When to Use It
Use this when you need a unique ID for a database row, when creating a tracking token for an analytics event, or when generating a request ID for API logging.
How to Use
- Click Generate to create one or more UUIDs.
- Set the quantity to generate multiple UUIDs at once.
- Copy individual UUIDs or the full list.
- Choose the output format: standard, uppercase, or no hyphens.
Frequently Asked Questions
Is a UUID v4 truly unique?
UUID v4 uses 122 bits of randomness. The probability of a collision is so low that it is considered unique for all practical applications.
What is the difference between UUID v1 and v4?
UUID v1 is based on the machine's MAC address and timestamp, which can leak information. UUID v4 is purely random and is the standard choice for most use cases.
Can I use a UUID as a database primary key?
Yes, but note that random UUIDs can cause index fragmentation in databases ordered by primary key. Sequential UUIDs (v7) or ULID formats may perform better for large tables.