ULID Generator

Online ULID generator for generating ULID values, suitable for unique identification and database records.

ULID Generator

ULID (Universally Unique Lexicographically Sortable Identifier) is a modern unique identifier generation scheme. It serves as an alternative to UUID, offering advantages such as time-based sorting and better readability.

Main Features

  1. Time-Sortable: ULIDs are sorted by time, facilitating database indexing and queries
  2. Uniqueness: Uses random numbers to ensure global uniqueness
  3. Friendly Format: Uses Crockford's Base32 encoding, avoiding ambiguous characters
  4. Fixed Length: Each ULID is 26 characters long
  5. Contains Timestamp: First 10 characters encode millisecond-precision timestamp

How to Use

  1. Quantity Setting:

    • Use the input box to set the number of ULIDs to generate (1-100)
    • Default generates 5 ULIDs

  2. Format Selection:

    • Raw format: One ULID per line
    • JSON format: Output as JSON array

  3. Operation Buttons:

    • Click "Generate" button to create new ULIDs
    • Click "Copy" button to copy results to clipboard

Use Cases

  • Database primary key generation
  • Unique identifiers in distributed systems
  • Time-sortable identifiers
  • Log event IDs
  • File naming

Technical Details

  • All generation processes are performed locally in the browser
  • Uses standard ULID algorithm
  • Supports batch generation
  • Guarantees time ordering and uniqueness

Usage Recommendations

  1. For Database Applications:

    • Raw format recommended
    • Can be used directly as primary keys

  2. For API Development:

    • JSON format available
    • Convenient for API responses and processing

  3. For Batch Generation:

    • Set reasonable quantities
    • Be mindful of timestamp continuity