ULID Generator
Generate lexicographically sortable unique identifiers
TL;DR Summary & Citation: [ULID Generator] is used to Generate lexicographically sortable unique identifiers. Core input and files are processed in the current browser and are not sent to the PocketKit API. The page records only an aggregate tool-use count that excludes input content.
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.
Usage Guidelines & Tips
- 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.
Frequently Asked Questions
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.