ULID Generator
Generate multiple ULIDs that stay sortable by time and easy to read.
Generate time-sortable ULIDs (Universally Unique Lexicographically Sortable Identifiers). A modern alternative to UUIDs for databases and distributed systems.
ULID Generator
Generate multiple ULIDs that stay sortable by time and easy to read.
About this tool
Generate time-sortable ULIDs (Universally Unique Lexicographically Sortable Identifiers). A modern alternative to UUIDs for databases and distributed systems.
Choose how many ULIDs you want to create in one batch.
Number of ULIDs
Choose how many ULIDs you want to create in one batch.
What is a ULID?
A ULID (Universally Unique Lexicographically Sortable Identifier) combines a millisecond timestamp with randomness to create globally unique identifiers.
Use ULIDs when you need IDs that keep chronological order while staying compact, URL friendly, and easy to copy or read aloud.
ULID vs UUID at a glance
- Sorting ULIDs alphabetically also sorts them by creation time because the first 10 characters encode the timestamp; UUID v4 values are fully random and cannot be ordered chronologically without extra metadata.
- ULIDs rely on Crockford's Base32 alphabet without ambiguous characters, so they are easier to read and share than hexadecimal UUID strings.
- UUIDs are standardized by RFC 4122, while ULIDs follow a community specification that many systems adopt when they need sortable yet unique identifiers.
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Choose how many ULIDs you want to create in one batch.
Number of ULIDs
Choose how many ULIDs you want to create in one batch.
What is a ULID?
A ULID (Universally Unique Lexicographically Sortable Identifier) combines a millisecond timestamp with randomness to create globally unique identifiers.
Use ULIDs when you need IDs that keep chronological order while staying compact, URL friendly, and easy to copy or read aloud.
ULID vs UUID at a glance
- Sorting ULIDs alphabetically also sorts them by creation time because the first 10 characters encode the timestamp; UUID v4 values are fully random and cannot be ordered chronologically without extra metadata.
- ULIDs rely on Crockford's Base32 alphabet without ambiguous characters, so they are easier to read and share than hexadecimal UUID strings.
- UUIDs are standardized by RFC 4122, while ULIDs follow a community specification that many systems adopt when they need sortable yet unique identifiers.
FAQ
Common questions and answers about this topic.
What is a ULID?
A ULID (Universally Unique Lexicographically Sortable Identifier) is a unique ID that combines a millisecond timestamp with randomness, making it both unique and sortable by creation time.
How is ULID different from UUID?
ULID is sortable by time and uses a more compact Crockford Base32 encoding, while UUID v4 is fully random and uses hexadecimal. ULID is ideal when time-ordering matters.
When should I use ULID vs UUID?
Use ULID when time-ordering matters, such as database primary keys or event logs. Use UUID when wider compatibility with existing systems is more important.
Is my data sent to any server?
No, ULID generation is performed entirely in your browser. The identifiers are created locally with JavaScript and never transmitted anywhere.