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Generate sortable ULIDs (time-ordered IDs). Use when ordering matters; for random UUIDs use uuid-generator, for tokens use token-generator. Input: count option. Returns ULID strings. 100% client-side.
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Generates ULIDs (Universally Unique Lexicographically Sortable Identifiers) — 26-character identifiers encoded in Crockford Base32 that sort chronologically. Supports generating up to 100 ULIDs at once with timestamp component highlighting.
UUIDs are not sortable by creation time and use inefficient encoding. ULIDs provide a sortable, URL-friendly alternative that embeds the timestamp, making them ideal for database primary keys and distributed systems.
This tool is part of the DevStackIO platform — a collection of free online developer tools from DevStackIO. Browse more free developer resources on DevStackIO.
Backend developers choosing identifiers for databases, distributed systems engineers, and anyone needing time-sortable unique IDs.
Set the count (1-100) of ULIDs to generate
Click 'Generate' to create the ULIDs
Each ULID is displayed with the timestamp portion highlighted in a different color
Click 'Copy' next to any individual ULID, or 'Copy All' to copy every ULID on separate lines
The timestamp portion (first 10 characters) encodes the millisecond-precision creation time
Single ULID: 01ARZ3NDEKTSV4RRFFQ69G5FAV (26 chars, Crockford Base32)Timestamp portion: 01ARZ3NDEK (first 10 chars, sortable by time)Batch of 3 generated at the same millisecond: 01H7F2XQ1A..., 01H7F2XQ1A..., 01H7F2XQ1A... — same timestamp prefix, unique random suffixSorted lexicographically, ULIDs always appear in creation order, unlike random UUIDsWhat is a ULID? A Universally Unique Lexicographically Sortable Identifier
a 128-bit value encoded as 26 Crockford Base32 characters.
How does ULID sorting work?
ULIDs sort lexicographically in time order because the timestamp occupies the most significant bits.
Are ULIDs collision-resistant?
Yes, the 80-bit random component provides collision resistance comparable to UUIDv4.
Can I extract the timestamp from a ULID?
Yes, the first 10 characters encode the millisecond-precision Unix timestamp.
Is my data shared?
No, ULIDs are generated locally in your browser using the Web Crypto API.
When should I choose ULID over UUID?
Choose ULID when records need to be orderable by creation time, such as database keys or event IDs.
Authoritative specifications, standards, and in-depth reading for ULID Generator.
About ULIDs
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