ULID Generator & Parser

Generate and parse ULIDs.

🔄 ULID Generator & Parser

Count:

Generated ULIDs:

🔍 Parse ULID

Paste ULID to Parse:

Parsed Result:

Paste a ULID to see its details

About ULID Generator & Parser

Universally Unique Lexicographically Sortable Identifier (ULID) generator and timestamp decoder conforming to the ULID specification, featuring millisecond timestamp sorting and Crockford Base32 encoding.

Key features

128-bit compatibility with UUIDs while maintaining natural chronological sortability.
Monotonic generation support ensuring proper ordering within the exact same millisecond.
Integrated ULID decoder extracting Unix epoch timestamps, ISO 8601 dates, and randomness entropy.
Crockford's Base32 encoding avoiding ambiguous characters (excludes I, L, O, U) for maximum human readability.

How to use

Configure Generation Quantity: Specify how many ULIDs you need to generate simultaneously.
Generate or Decode ULID: Generate new sortable IDs or paste an existing ULID into the inspector to extract its timestamp.
Copy Identifiers: Click "Copy" to transfer the ULID strings into your database primary keys or log streams.

FAQ

What is a ULID and how does it differ from a UUID v4?

A ULID is a 128-bit identifier encoded as 26 Crockford Base32 characters that begins with a 48-bit timestamp, allowing natural chronological indexing in databases.

Why are ULIDs better for database indexing than random UUIDs?

Because ULIDs are ordered by creation time, they prevent B-tree page fragmentation in PostgreSQL and MySQL indexes, improving write throughput.

What does Crockford's Base32 character set provide?

It uses 32 alphanumeric characters, excluding I, L, O, and U to prevent visual confusion and accidental profanity.

Can an existing ULID be reversed to find its creation timestamp?

Yes, the first 10 characters encode a 48-bit UNIX timestamp with millisecond resolution, fully decodable into UTC dates.

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About ULID Generator & Parser

Key features

128-bit compatibility with UUIDs while maintaining natural chronological sortability.

Monotonic generation support ensuring proper ordering within the exact same millisecond.

Integrated ULID decoder extracting Unix epoch timestamps, ISO 8601 dates, and randomness entropy.

Crockford's Base32 encoding avoiding ambiguous characters (excludes I, L, O, U) for maximum human readability.