Tool description

This free online ULID generator creates ULIDs (Universally Unique Lexicographically Sortable Identifiers) with just a click. Generate ULID online instantly without any installation - our ULID creator makes it easy to create ULID identifiers for your projects. ULIDs are like UUIDs but with a special advantage - they're sortable by time! Each ULID contains a timestamp and random data, making them perfect for distributed systems where you need both uniqueness and chronological ordering.

Features

  • Standard ULID: Generates a new random ULID with current timestamp
  • Monotonic ULID: Ensures ULIDs are always increasing, even when generated within the same millisecond
  • Instant generation: Create ULID identifiers with a single click using our online ULID generator

What is ULID?

ULID stands for Universally Unique Lexicographically Sortable Identifier. Unlike traditional UUIDs, ULIDs:

  • Are 128-bit compatible with UUID
  • Are lexicographically sortable (you can sort them alphabetically and get chronological order)
  • Encode a timestamp in the first 48 bits
  • Use Crockford's base32 for better readability (no ambiguous characters)
  • Are case insensitive
  • Are URL safe

ULID Types

  • Standard: Each ULID is generated independently with the current timestamp and random data
  • Monotonic: Ensures that ULIDs generated within the same millisecond are incremental, preventing duplicate values in high-frequency generation scenarios