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ULID Generator
Generate sortable unique IDs that preserve creation order.
Tool Panel
Processed locallyAbout ULID Generator
Generates time-sortable ULIDs: the first 48 bits are a millisecond timestamp, so they sort in insertion order.
- 1
26 characters = a **10-character millisecond timestamp** (Crockford Base32) plus 16 random characters (80 bits). The time prefix makes lexicographic order approximate creation order — the whole point of ULID, and why it suits a primary key better than UUIDv4.
- 2
The alphabet is Crockford Base32, which drops `I`, `L`, `O` and `U` so transcription and dictation do not confuse `I`/`l`/`1` or `O`/`0`.
- 3
Generate 1–20 at a time; new results are prepended to the list and each id has its own copy button.
- 1
Set the count
One by default; enter 2–20 to batch, and results land in the list in generation order.
- 2
Generate
Each click appends rather than replacing the previous batch (reload the page to clear).
- 3
Copy
Copy them one by one in the order you need.
Pick ULID when you want **sortable and short** (26 vs 36 characters, and time-ordered); pick UUID when you want **ubiquity and a standard** (v4 fully random, v7 also time-prefixed, with more tooling and validators around). As a database primary key under write-heavy load, the ordering of ULID is friendlier to the index.
No: the 16 random characters decide, so which one sorts first is arbitrary. The ULID spec has an optional monotonic variant for within-millisecond ordering, which this tool does not implement — keep a counter in your application if you need strict monotonicity.
The exact generation instant, to the millisecond — the first 10 characters decode straight to it. That is the price of sortability: use UUIDv4, or encrypt the timestamp before encoding, when creation time is sensitive.
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