CUID2 is the second generation of the Collision-Resistant Unique Identifier. It uses cryptographically strong randomness and starts with a lowercase letter, producing short, URL-safe IDs ideal for database primary keys and distributed systems.

How likely is a collision?

With a length of 10 characters using a 36-character alphabet, you would need to generate billions of IDs before a collision becomes remotely probable. The tool shows the exact mathematical probability for your settings.

Can I use these as database primary keys?

Yes. CUID2 was specifically designed for use as collision-resistant identifiers in databases and distributed systems. The configurable length lets you balance key size against collision safety.

CUID2 Generator

Generate CUID2 identifiers with configurable length, batch output, and real-time collision probability estimates.

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How to use Random ID Generator

Set your desired ID length (2-32 characters).
Choose how many IDs to generate (1-100).
Click Generate and use the copy buttons to use your CUID2 identifiers.

CUID2 Generator అంటే ఏమిటి?

CUID2 is a collision-resistant identifier format designed to be short, URL-friendly, and highly unlikely to collide. Each ID starts with a lowercase letter followed by alphanumeric characters, making them safe for use in URLs, database keys, and distributed systems.

This browser-based tool lets you customize the ID length from 2 to 32 characters, generate up to 100 IDs at once, and see the mathematical collision probability for your chosen parameters. All generation uses crypto.getRandomValues for strong randomness.

FAQ

What is CUID2?: CUID2 is the second generation of the Collision-Resistant Unique Identifier. It uses cryptographically strong randomness and starts with a lowercase letter, producing short, URL-safe IDs ideal for database primary keys and distributed systems.
How likely is a collision?: With a length of 10 characters using a 36-character alphabet, you would need to generate billions of IDs before a collision becomes remotely probable. The tool shows the exact mathematical probability for your settings.
Can I use these as database primary keys?: Yes. CUID2 was specifically designed for use as collision-resistant identifiers in databases and distributed systems. The configurable length lets you balance key size against collision safety.

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Marcus Webb"The DevTool Craftsman"

Full-Stack Developer & Tools Architect

Marcus has been writing code since the dial-up era. He has contributed to open-source developer tools, built CI/CD pipelines for startups, and debugged production incidents at 3 AM more times than he would like to admit. His philosophy is that the best developer tool is the one that gets out of your way, and he writes about practical tooling that helps teams ship faster with fewer headaches.

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