ULID generator.
Generate ULIDs, the 26-character ids that sort by creation time, and decode the timestamp inside any ULID. Monotonic within a millisecond when you need it.
ULID generator.
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3 steps, no account. It runs in your browser and nothing is uploaded.
Set the count
One to a thousand, upper or lower case.
Turn on monotonic if needed
So ULIDs made in the same millisecond keep their order.
Copy or decode
Paste any ULID to read its time, its random part and its UUID form.
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Questions and answers
Before you trust the result: what to know about the format, the limits, your data and the tools next to it.
A Universally Unique Lexicographically Sortable Identifier: 128 bits written as 26 Crockford Base32 characters, the first 10 a millisecond timestamp and the last 16 random. ULIDs sort by creation time as plain strings.
Both put a millisecond time first and randomness after, so both sort by time. A ULID is 26 characters with no hyphens; a UUID v7 is the standard 36-character UUID form that databases have a type for. The bits convert one to the other.
Within one millisecond, a monotonic generator adds one to the random part of the previous ULID instead of drawing a new one, so ids made in the same millisecond still sort in the order they were made.
Crockford's Base32: 0–9 and A–Z without I, L, O and U, so no two characters look alike. Reading is case-insensitive, and I and L are read as 1, O as 0.
Set the count and the case, turn on monotonic if they must sort in creation order, and copy or download the list.
Paste one into the decoder: its time is read out as a date in UTC and your zone, with the random part in hex and the same 128 bits as a UUID.
No. The ULIDs are made from your clock and crypto.getRandomValues in the browser; the page makes no request.
No. The ULID generator is free and opens without a sign-in, an account or an install.
Nothing. The ULID generator holds your input in the page's memory, so closing or reloading the tab clears it, and it saves nothing in this browser.
Closest to the ULID generator: UUID generator, Nano ID generator, Unix timestamp converter, Random string generator. Each opens on its own page, free and in the browser.
The ULID generator is one of 20 in its group. The group's page, /tools/security, lists them all.
The tool is free. Its interface is built from shadcn.io's own components (Button, Input, Slider and the rest of the registry under /ui), which come in React, Vue, Svelte and Solid. Pro adds the blocks and templates for the product around it.
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