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ULID Generator - Generate Sortable Unique IDs Online Free

Free ULID generator. Create Universally Unique Lexicographically Sortable Identifiers online. Decode ULID timestamps. Better than UUID for sorted data.

Decode ULID Timestamp

About ULID (Universally Unique Lexicographically Sortable Identifier)

ULID (Universally Unique Lexicographically Sortable Identifier) is a modern alternative to UUID that provides 128-bit unique identifiers with built-in timestamp sorting. Each ULID encodes a millisecond-precision timestamp in the first 48 bits and 80 bits of cryptographic randomness, formatted as a 26-character Crockford Base32 string. This makes ULIDs ideal for database primary keys, distributed systems, and any use case requiring chronologically sortable unique identifiers.

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How to Use

  1. Set the number of ULIDs to generate (1-100)
  2. Click 'Generate ULIDs' to create new identifiers
  3. Copy individual ULIDs or all at once
  4. Paste a ULID in the decode section to extract its timestamp

Common Use Cases

  • Database primary keys that sort chronologically
  • Distributed systems requiring sortable unique identifiers
  • Event logging with time-ordered IDs
  • Replacing UUIDs when lexicographic sorting is needed

Frequently Asked Questions

What is a ULID?
A ULID (Universally Unique Lexicographically Sortable Identifier) is a 26-character, 128-bit identifier that encodes a timestamp and random data. ULIDs sort naturally by creation time.
ULID vs UUID - which should I use?
Use ULID when you need time-sorted IDs (databases, logs). Use UUID when you need maximum compatibility. ULIDs are URL-safe and more compact than UUIDs.
Are ULIDs truly unique?
Yes. ULIDs combine a 48-bit millisecond timestamp with 80 bits of randomness, making collisions virtually impossible.
Can I extract the timestamp from a ULID?
Yes! The first 10 characters encode the creation timestamp. Use the decode section below the generator to extract it.
What encoding do ULIDs use?
ULIDs use Crockford's Base32 encoding (0-9, A-Z excluding I, L, O, U), which is URL-safe and case-insensitive.