UUID & API Key Generator
Generate UUIDs & API keys
Generated locally with the Web Crypto API — nothing is ever sent or stored.
What Is the UUID & API Key Generator?
The UUID & API Key Generator creates version 4 UUIDs and random API keys in bulk, securely in your browser using the Web Crypto API. Generate one or thousands, copy them instantly, or export the list — perfect for developers who need unique identifiers, test data, or random secrets without reaching for a library or a server.
Key Features
What Is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit value designed to be unique across space and time without a central authority. Version 4 UUIDs are generated from random data, making collisions astronomically unlikely. They are the standard choice for database keys, distributed systems, and anywhere you need a guaranteed-unique identifier.
Generating Secure API Keys
API keys and tokens must be unpredictable to be secure. This tool generates them from a cryptographically secure random source, so they cannot be guessed. Generating locally means the keys exist only on your device until you use them — important for secrets that should never pass through a third-party server.
Common Use Cases
- Generating unique IDs for database records
- Creating API keys and tokens for a project
- Producing test data with unique identifiers
- Bulk-generating UUIDs for a migration or seed
Frequently Asked Questions
What is a version 4 UUID?
A version 4 UUID is generated from random numbers rather than time or hardware. It is the most common UUID type because it requires no coordination and the chance of two colliding is negligible.
Are the UUIDs guaranteed unique?
In practice, yes. Version 4 UUIDs have 122 bits of randomness, so the probability of generating a duplicate is so small it can be safely ignored for virtually any application.
Are the API keys secure?
Yes. Keys are generated using the Web Crypto API’s cryptographically secure random number generator, making them unpredictable and suitable for use as secrets.
Can I generate many at once?
Yes, you can bulk-generate hundreds or thousands of UUIDs or keys at once and copy or export the full list in a click.
Is anything sent to a server?
No. All generation happens locally in your browser, so the UUIDs and keys never leave your device.
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