CUID2 Generator
Generate CUID2s (Collision-resistant Unique Identifiers) for your applications. Create secure, URL-safe, and sortable 24-character identifiers for databases and APIs.
Generate multiple CUIDs at once
CUID2 Information
- • URL-Safe: No special characters, perfect for URLs and filenames
- • Sortable: Lexicographically sortable by generation time
- • Collision-Resistant: Extremely low probability of duplicates (~1.6 × 10³⁹)
- • Fixed Length: Always 24 characters, shorter than UUIDs (36 chars)
- • Improved Security: Better entropy and performance than original CUID
- • Generated locally in your browser - no data sent to servers
CUID vs UUID
- • Shorter: 24 chars vs 36 chars for UUID
- • URL-Safe: Only lowercase letters and numbers
- • Sortable: Chronologically ordered
- • Readable: More human-friendly format
- • Fast: Optimized for performance
Common Use Cases
- • Database record identifiers
- • URL slugs and parameters
- • API resource identifiers
- • File and folder naming
- • Session and tracking IDs
CUID2 Technical Specifications
- • Length: 24 characters (fixed)
- • Alphabet: a-z, 0-9 (36 characters)
- • Structure: timestamp (8 chars) + random (16 chars)
- • Collision resistance: ~1.6 × 10³⁹
- • Sortable: Chronologically ordered by generation time
- • Performance: Optimized for speed and security
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