A short companion for ULID Generator: when it is useful, what it expects, and what to check before using the result.
What it does
ULIDs are 128-bit identifiers like UUIDs, except the first 48 bits are a millisecond timestamp. That makes them sortable by creation time while staying unique, which is handy as a primary key when you want insertion order without keeping a separate timestamp column.
Use the tool
Open ULID Generator, add the input the tool asks for, run it, and check the output before using it elsewhere.
Input and output
- Input: text.
- Output: text.
- Category: Crypto.
Privacy and processing
Processing happens locally in your browser. This tool does not upload the input to ilham.dev.
Questions
Should I use a ULID or a UUID?
ULIDs if you want keys that sort by creation time and stay roughly chronological. UUIDs if you need the widest possible support, or must not reveal when a record was created.
Are ULIDs case-sensitive?
The canonical form is uppercase Crockford Base32, and that is what this tool produces.
Related guide
For broader background, see IDs and Test Data.