ULID Generator
Generate Universally Unique Lexicographically Sortable Identifiers (ULID).
Nano ID / ULID Generator
About ULID Generator
The ULID (Universally Unique Lexicographically Sortable Identifier) Generator creates 128-bit URL-safe, time-sortable 26-character string identifiers using Crockford's Base32 encoding with millisecond timestamp precision.
How to Use ULID Generator
Step 1
Select count of ULIDs to generate (1 to 1,000).
Step 2
Toggle monotonic mode if generating high-frequency sequential records.
Step 3
Inspect the generated ULID string stream.
Step 4
Click "Copy ULIDs".
Practical Use Cases for ULID Generator
URL-Safe & Case-Insensitive Identifiers
Generate compact 26-character public IDs (`01ARZ3NDEKTSV4RRFFQ69G5FAV`) that are safe in URLs, case-insensitive, and naturally time-sortable.
NoSQL & Distributed Event Sourcing
Create sortable document keys for DynamoDB, MongoDB, and Redis without requiring numeric auto-increment sequences.
Input & Output Examples
Generating ULID for Event Record
Timestamp: Current Time, Monotonic: Enabled
01HX5Z3Y8Q7M9K2P4N6R8T0V2W (26-character Crockford Base32 string)
Key Features & Performance
- ✓Encodes in Crockford's Base32: avoids ambiguous letters (`I`, `L`, `O`, `U`) to prevent human transcription errors.
- ✓Lexicographically sortable: alphabetical sorting matches chronological creation order.
- ✓Supports monotonic counter mode for multiple ULIDs generated within the same millisecond.
- ✓100% Client-Side generation.
- ✓1-Click Copy and 1-Click file export.
Key Terminology & Definitions
Crockford's Base32
A 32-character encoding alphabet (`0123456789ABCDEFGHJKMNPQRSTVWXYZ`) designed to be human-readable and typo-resistant.
Monotonicity
The property guaranteeing that ULIDs generated in the same millisecond remain strictly ordered by incrementing the random bit component.