🆔 ULID Generator
⚡ Output
ℹ️ About ULID Generator
ULID (Universally Unique Lexicographically Sortable Identifier) is a modern alternative to the traditional UUID. While UUIDs are excellent for uniqueness, they are often completely random and do not sort efficiently in database indexes, leading to performance issues as datasets grow.
ULIDs solve this by combining a 48-bit timestamp with 80 bits of cryptographically secure randomness. The result is a 128-bit identifier that is naturally sortable by the time it was created. They are encoded using Crockford's Base32 for excellent readability and exclude ambiguous characters like 'I', 'L', 'O', and 'U'.
📖 How to use ULID Generator
- 1. Click 'Run Tool' to generate a fresh ULID.
- 2. Review the embedded timestamp to see exactly when the ID was generated.
- 3. Use the 26-character string as a primary key in your database or as a distributed tracking ID.
❓ Frequently Asked Questions
Can I convert a ULID to a UUID?
Yes. Since both are 128-bit, they are structurally compatible. Many libraries provide native conversion between the two formats.
Are ULIDs secure?
Yes. With 80 bits of randomness per millisecond, the collision probability is effectively zero, and the IDs are not predictable.
Why use ULIDs over UUID v4?
Use ULIDs if you need your identifiers to be chronological (sortable by date) while still maintaining the global uniqueness of a 128-bit ID.
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