# ULID Generator

> Generate ULIDs — sortable, URL-safe 26-character identifiers with a built-in timestamp. Free, cryptographically random, generated in your browser.

URL: https://uttir.com/ulid-generator
Categories: generators, developer-tools
Privacy: IDs are generated locally using your browser's secure random number generator. Nothing is sent to a server.

## About

A ULID (Universally Unique Lexicographically Sortable Identifier) is a 26-character identifier with two parts: a 10-character timestamp (milliseconds since the Unix epoch) and a 16-character random part. Compare that to a UUID, which is 36 characters and has no time component.

Because the timestamp is at the front, ULIDs sort in the same order as the events that created them. If you insert two rows into a database and look at the IDs, the lower ID was created first — no separate created_at column needed. The random part is 80 bits of cryptographic randomness, the same collision resistance as a UUIDv4.

## How to use

1. **Set quantity** — Pick how many ULIDs to generate, from 1 to 1000.
2. **Generate** — Click the button. Each ID is 26 characters, URL-safe, and case-insensitive.
3. **Copy or download** — Use Copy to grab the IDs, or Download to save as a .txt file (one per line).

## Examples

### A single ULID

A typical ULID with the current timestamp prefix.

Output:

```
01HZX8K3M7QFYR2X5VJ8N4P6WA
```

### A batch of 5

Five ULIDs generated in one call. They will sort in the order they were created.

Output:

```
01HZX8K3M7QFYR2X5VJ8N4P6WA
01HZX8K3M7QFYR2X5VJ8N4P6WB
01HZX8K3M7QFYR2X5VJ8N4P6WC
01HZX8K3M7QFYR2X5VJ8N4P6WD
01HZX8K3M7QFYR2X5VJ8N4P6WE
```

## FAQ

### When should I use a ULID instead of a UUID?

Use a ULID when chronological ordering matters — event logs, distributed databases, time-series data, message queues. Use a UUID when you only need uniqueness and your database already stores a separate created_at index.

### Can I extract the creation time from a ULID?

Yes. The first 10 characters encode the millisecond timestamp. This tool exposes the timestamp for every ID it generates, and you can extract it from any valid ULID using the same formula.

### Are ULIDs collision-resistant?

Yes. The random part is 80 bits drawn from a cryptographically secure source, so the chance of a collision is roughly 1 in 1.2 × 10^24 — the same order of magnitude as a UUIDv4.

## Related tools

- [UUID Generator](https://uttir.com/uuid-generator) — Generate cryptographically random UUID v4 identifiers, one or a thousand at a time.
- [Password Generator](https://uttir.com/password-generator) — Create strong, random passwords with custom length and character sets — right in your browser.
- [Random Number Generator](https://uttir.com/random-number-generator) — Pick a random number, roll dice, or shuffle a list. Cryptographically secure, runs locally.

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For the full HTML page with the live tool, visit https://uttir.com/ulid-generator.
This file is the markdown rendering at https://uttir.com/ulid-generator.md. See https://uttir.com/llms.txt for a site-wide summary.