Cómo usar: ULID & Nano ID Generator
- Choose ULID for IDs that sort by time (great as database keys), or Nano ID for short, random, URL-friendly IDs.
- Set how many to generate — up to 1,000. For ULIDs keep monotonic on so IDs made in the same millisecond still sort in order.
- For Nano IDs pick the length and alphabet (or type your own) and an optional prefix like
usr_; the collision risk panel shows if it is long enough. - Copy or download the list. Paste a ULID into Decode to see when it was created.
ULID vs Nano ID vs UUID
| ULID | Nano ID (default) | UUID v4 | |
|---|---|---|---|
| Length | 26 characters | 21 characters | 36 characters |
| Randomness | 80 bits + 48-bit timestamp | 126 bits | 122 bits |
| Sorts by time | Yes | No | No (v7 does) |
| URL-safe | Yes (Crockford Base32) | Yes | Yes, but long |
A ULID starts with a 10-character timestamp (milliseconds since 1970) followed by 16 random characters, in Crockford’s Base32 alphabet — no I, L, O or U, so it is hard to misread. Because the time comes first, ULIDs sort in creation order, which keeps database indexes compact. A Nano ID is pure randomness: with the default 21 URL-safe characters you would need to create a billion IDs every second for about 40 years before there is a 1% chance of a single duplicate.
Both are generated with crypto.getRandomValues, without the bias of Math.random() or modulo tricks. Need standard UUIDs? Use the UUID Generator.
También se busca como: ulid generator, nanoid generator, nano id generator, generate ulid, ulid decoder, ulid to timestamp, short unique id generator, nanoid collision calculator.
Herramientas que combinan con: ULID & Nano ID Generator
- Generador de contraseñas — Crea contraseñas seguras y verdaderamente aleatorias o frases de contraseña fáciles de escribir, con reglas avanzadas: incluye o excluye palabras, exige determinados caracteres, elige los símbolos permitidos, evita repeticiones y secuencias.
- Hash Generator — Compute MD5 and SHA hashes of any text or file instantly, create HMAC signatures, and paste an expected checksum to verify a download.
- Generador de números aleatorios — Genera números aleatorios (con o sin duplicados), elige ganadores de una lista, mezcla nombres, divide grupos en equipos, lanza monedas y tira los dados, todo ello utilizando el generador de números aleatorios criptográficamente seguro de tu navegador.
- Unix Timestamp Converter — See the current Unix time live, convert any epoch timestamp (seconds, milliseconds, micro- or nanoseconds) to a date in any time zone, and turn dates back into timestamps.
Preguntas frecuentes
What is a ULID?
A Universally Unique Lexicographically Sortable Identifier: 26 characters, 48 bits of millisecond timestamp plus 80 random bits, encoded in Crockford Base32. ULIDs sort by creation time, unlike UUID v4.
How short can a Nano ID be?
It depends on how many you create. Enter your rate in the collision panel: it shows how long until there is a 1% chance of a duplicate. For public IDs created often, keep 16 characters or more.
Can I get the date from a ULID?
Yes — paste it into Decode a ULID. The first 10 characters are the creation time in milliseconds, shown as a date in your time zone and in UTC.
What does monotonic mean?
When several ULIDs are made in the same millisecond, monotonic mode increments the random part instead of drawing a new one, so they still sort in the exact order they were created.
¿Puedo instalar ULID & Nano ID Generator como aplicación web y utilizarla sin conexión?
Sí. ULID & Nano ID Generator es una aplicación web instalable (PWA): se instala desde el navegador, no se descarga desde una tienda de aplicaciones. Haz clic en «Instalar aplicación» en la parte superior de esta página en Chrome o Edge (Windows, macOS, Linux, ChromeOS) o, en Android, utiliza «Compartir» → «Añadir a la pantalla de inicio» en iPhone y iPad, o «Archivo» → «Añadir al Dock» en Safari 17+ en un Mac. A continuación, se abrirá en su propia ventana con su propio icono y, como se ejecuta íntegramente en tu navegador, seguirá funcionando sin conexión. Firefox en el ordenador de sobremesa no permite instalar aplicaciones web. Cómo funciona la instalación.