ULID Generator
Generate Universally Unique Lexicographically Sortable Identifiers — time-ordered, URL-safe 26-character IDs.
Generated ULIDs
1 ULIDWhy Use ULIDs Over UUIDs?
Comprehensive breakdown of features designed to make database indexing, distributed sorting, and unique identification efficient.
Universally Unique Lexicographically Sortable Identifiers (ULIDs) combine the unicity of standard UUIDs with built-in chronological sorting. Because standard UUIDv4 strings are completely random, inserting them into database indexes causes heavy fragmentation and write amplification. ULIDs solve this by embedding a 48-bit millisecond precision timestamp followed by 80 bits of cryptographically secure randomness.
Our ULID Generator tool allows you to instantly create standard-compliant, 26-character URL-safe identifiers using Crockford's Base32 alphabet. Whether you need single IDs for testing or batch generation for mock datasets, everything runs securely inside your browser with zero latency or network requests.
Lexicographical Sorting
Time-ordered structure ensures generated IDs naturally sort chronologically, optimizing B-tree database index performance.
Crockford Base32
Uses a 26-character URL-safe alphabet excluding easily confused characters like I, L, O, and U to prevent human error.
Bulk Generation
Generate multiple ULIDs simultaneously with one-click individual or bulk clipboard copying capabilities.
100% Client-Side Processing
All identifier calculations run entirely within your browser using secure crypto random number generation.
Responsive Mobile Design
Optimized layouts look and perform flawlessly whether you are testing on desktop workstations or mobile devices.
Lightning Fast Utility
Generate valid unique identifier strings instantly without network delays for maximum development productivity.