About this Tool
While UUIDs are great, their complete randomness means they fragment database indexes and cannot be sorted by creation time. ULIDs solve this. They encode a millisecond-precision timestamp in the first 48 bits, followed by 80 bits of cryptographic randomness. This means they are completely unique, but can be safely sorted chronologically in your database.
Frequently Asked Questions
Are ULIDs compatible with UUID columns?
Both are 128-bit identifiers. While they look different as strings (ULIDs use a 26-character Base32 encoding, UUIDs use 36-character Hex), they can both be stored in standard 128-bit database columns (like Postgres UUID types) if converted properly.
Is the ULID case-sensitive?
No. The standard Base32 encoding used for ULIDs excludes confusing characters like I, L, O, and U, and is entirely case-insensitive.