ULID Generator
Generate ULIDs (Universally Unique Lexicographically Sortable Identifiers) instantly using JavaScript. Great for time-ordered unique IDs.
ULID Generator
Powered byJavaScript & the Web Crypto API
All ULIDs are generated locally using cryptographically secure randomness; nothing is sent to a server.
Select a number and click Generate to create ULIDs.
What is a ULID?
ULIDs (Universally Unique Lexicographically Sortable Identifiers) are 26-character base32 strings that sort by creation time.
Sortable by time
ULIDs use a millisecond timestamp prefix so IDs generated later sort after earlier IDs.
Compact & safe
ULIDs are 26 characters in Crockford Base32, making them URL-safe and easy to store.
Client-side only
Generation happens locally in the browser; nothing is sent to a server.
What is a ULID?
A ULID is a 26-character identifier that uses a 48-bit timestamp (milliseconds since UNIX epoch) followed by 80 bits of randomness.
ULIDs are designed to be lexicographically sortable while remaining compact and collision-resistant.
- 26 chars, Crockford Base32 (0-9A-Z minus I,L,O,U)
- Includes 48-bit timestamp (ms since 1970)
- Includes 80 bits of randomness
- Sorts in creation order when treated as a string
ULID Structure
48 bits
80 bits
This tool generates the full 26-char ULID using secure randomness and the current time.
Other UUID Tools
ULIDs are a great complement to UUIDs; the WebEasier suite supports both.
| Tool | Use Case | Format | Typical Size |
|---|---|---|---|
| UUID v4 | General unique IDs | 8-4-4-4-12 hex | 36 chars |
| ULID | Time-sortable IDs | 26-char base32 | 26 chars |
Example ULIDs
Click an example to generate a ULID quickly.
Frequently Asked Questions
Answers to common questions about ULID generation.
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