Ulid Generator
Fast, accurate and free online ulid generator tool running directly in your browser.
-
1Enter data
Enter content, paste text or load a file from disk. -
2Click the button
The tool will immediately process your data in the browser. -
3Get the result
Copy the finished text or save the file to your device.
return "Result ready in 0.1s";
}
01M1AA9YMX4RBQN4NEDFK7CABV 01M1AA9YMXE8VK72DFHR2YYH76 01M1AA9YMXDMQ8066AMBV5V0ME 01M1AA9YMXW9VQPZNJA1RKDTQX 01M1AA9YMX52WYJY08W1R4RSMT 01M1AA9YMXY2PHWRG3AFT9GYBN 01M1AA9YMX0CYNAJ1BRP02BGGF 01M1AA9YMXKA2Q3QKJRGB8DAG1 01M1AA9YMYJQW6T0N0DK2DNW25 01M1AA9YMYJ26G0284BF7C1T65
Rate this tool:
Related tools
Other tools you may find usefulULID Generator
The ULID (Universally Unique Lexicographically Sortable Identifier) generator creates unique, lexicographically sortable identifiers in the 26-character Crockford Base32 code format. Perfect for distributed systems, databases and APIs requiring global uniqueness without coordination.
What is ULID for?
ULID is a modern alternative to UUID, designed with database performance in mind. The first 10 characters encode the timestamp to the nearest millisecond, making identifiers sortable chronologically - unlike random UUIDs v4. It works well in microservice systems, event sourcing, distributed logging and wherever it is important to maintain order without a central sequence generator. The generator supports simple format (26 characters, e.g.01ARZ3NDEKTSV4RRFFQ69G5FAV) and grouped format (4-4-4-4-4-6, e.g.01AR-Z3ND-EKTS-V4RR-FFQ6-9G5FAV) for easier readability. The initialization text option allows you to mix your own entropy into the random generator.
How to use the generator?
Set the number of IDs to generate (1-1000), select the display format (simple or grouped), and optionally enable lowercase. You can enter initialization text - such as the project name or task ID - which will be randomised, which is useful for documenting or debugging. Click "Generate" and clickable chips will appear in the right panel - each click copies the given ULID to the clipboard. The "Copy All" button will copy the entire list, and the "Download .txt" button will save it as a text file.
FAQ
How is ULID different from UUID?
UUID v4 is completely random and maintains no temporal order, making it difficult to sort and index in databases. ULID encodes a timestamp (48 bits) in the first 10 characters, so sequentially generated identifiers are lexicographically sorted chronologically. Additionally, ULID uses the Crockford Base32 alphabet (without the letters I, L, O, U), which eliminates ambiguities when transcribing by hand.
Are the generated ULIDs truly unique?
Yes. Each ULID combines a 48-bit timestamp (ms since the Unix era) with 80-bit randomness, giving a space of 2^80 ≈ 1.2 × 10^24 combinations in the same millisecond. The probability of collision is negligible even with mass generation. The optional initialization text is doped to a random part, it does not negatively affect uniqueness.
What is the "Initial text" field used for?
This optional field allows you to add your own entropy to the generator. The entered text is hashed (XOR) with random bytes using SHA-256. This is useful, for example, when documenting test sets (each set has its own seed = repeatable pattern) or when debugging. Not required for normal use.
Can I use ULIDs as primary keys in a database?
Yes, this is one of the main advantages of ULID. Sorted IDs reduce fragmentation of B-tree indexes (especially in MySQL/PostgreSQL with clustered indexes), which translates into faster insertions and less rewriting of data pages. The 26-character format (text/varchar) is compact and human-readable enough.