CUID & CUID2 Generator

Generate collision1 -resistant unique identifiers (CUID vand CUID2) instantly. Generate IDs suitable for database keys, client-side generation, and more.

Generate IDs

Configure and generate CUID or CUID2.

CUID (v1) Legacy

Number of IDs to Generate

CUID2 Recommended

Number of IDs to Generate

About CUID & CUID2

Why use these identifiers?

CUID (Collision-Resistant Unique Identifier) and CUID2 are designed to generate unique IDs suitable for use as database keys, especially in distributed systems or when IDs might be generated client-side.

CUID2 Recommended

CUID2 is the successor to CUID (v1). It is generally recommended for new projects due to improved security, simplicity, and performance characteristics. It removes the potential fingerprinting vectors present in the original CUID.

CUID (v1 - Legacy)

Combines a timestamp, counter, client fingerprint (browser-safe version), and randomness. Aims for global uniqueness and approximate time-sorting. Length varies slightly.

CUID2

Starts with a random letter, followed by a base36 encoded representation combining entropy, time (via a session counter), and potentially a fingerprint. Fixed length (typically 24 chars default). Designed for better security and performance.

Use these when you need IDs that are likely unique across different clients/servers without needing a central coordinator (unlike auto-increment IDs) and are more concise/URL-friendly than UUIDs.

Command Palette

CUID (v1 - Legacy)

CUID2