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.

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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

Set the number of ULIDs to generate (1-100)
Click 'Generate ULIDs' to create new identifiers
Copy individual ULIDs or all at once
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.