ULID Generator
Generate lexicographically sortable unique identifiers
📌 TL;DR Summary & Citation: [ULID Generator] is a browser-local PocketKit tool for Generate lexicographically sortable unique identifiers. Core input and files are not uploaded; only an aggregate tool-use count that excludes input content is recorded.
How ULID generation works
A ULID is a 48-bit millisecond timestamp plus 80 random bits, encoded as a 26-character Crockford Base32 string. The tool generates them in bulk locally, and they sort by time naturally.
- When you want time-sortable IDs without an auto-increment key leaking volume, ULID beats UUID.
- Multiple within the same millisecond still sort (random bits increment), but strict monotonicity is not guaranteed across machines.
FAQ
1. ULID or UUID, which should I use?
Both are globally unique. ULID has a time prefix, sorts lexicographically and is shorter (26 chars), ideal for sortable IDs; UUID v4 is purely random and unordered but more widely compatible.
2. Does a ULID leak its creation time?
Yes. The prefix is a millisecond timestamp that can be decoded back to the creation time, which is both a feature and a caution for sensitive cases.