ULID Generator for Developers – Fast, Sortable, Collision-Resistant IDs
ULID (Universally Unique Lexicographically Sortable Identifier) is a modern alternative to UUIDs, designed for high-performance systems, distributed databases, and developer-friendly workflows.
This guide explains what ULID is, why developers prefer it, and how to generate ULIDs instantly using a production-ready ULID Generator.
👉 Try the live tool above
What Is a ULID?
A ULID is a 128-bit identifier encoded as a 26-character Crockford Base32 string.
Unlike UUID v4:
- ULIDs are lexicographically sortable
- ULIDs are time-based
- ULIDs are URL-safe and human-readable
Example ULID:
01HXZP8K2F8M4QJ9Y3B0A7C9GJ
ULID vs UUID – Why ULID Wins for Modern Systems
| Feature | ULID | UUID v4 |
|---|---|---|
| Sortable | ✅ Yes | ❌ No |
| Time-based | ✅ Yes | ❌ No |
| URL-safe | ✅ Yes | ⚠️ Needs encoding |
| Database indexing | 🚀 Fast | 🐢 Slower |
| Collision resistance | ✅ High | ✅ High |
ULIDs are ideal for logs, event streams, databases, and APIs.
Why Developers Use ULIDs in Production
ULIDs solve common problems in distributed systems:
- Chronological ordering without extra indexes
- Better database performance (especially PostgreSQL & MySQL)
- Readable IDs for debugging
- Scales well across microservices
That’s why ULIDs are now common in SaaS platforms, event sourcing, and cloud-native systems.
Instant ULID Generator – Single & Bulk
This ULID Generator provides:
🚀 Features
- Instant ULID generation
- Single ULID generation
- Bulk ULID generation (thousands at once)
- No login required
- Client-side, fast, and secure
Perfect for development, testing, seeding databases, and CI pipelines.
How ULID Generation Works (Step by Step)
- Timestamp (48 bits) – current Unix time in milliseconds
- Randomness (80 bits) – cryptographically secure entropy
- Base32 encoding – human-friendly, sortable output
This guarantees:
- Uniqueness
- Orderability
- High throughput
ULID Example Output
Single ULID:
01HXZQ4Y3PZ6E9M2K7F8C0A4NV
Bulk ULIDs:
01HXZQ4Y3R1A1QKX6PZC9T3D1M
01HXZQ4Y3R2W8F7H5ZP6C1A0B
01HXZQ4Y3R3J4M9Q2Y8X6C5D7
How to Generate ULIDs in JavaScript (Next.js)
Install ULID
npm install ulidGenerate a ULID
import { ulid } from "ulid";
const id = ulid();
console.log(id);Bulk ULID Generator
import { ulid } from "ulid";
export function generateBulkULIDs(count: number) {
return Array.from({ length: count }, () => ulid());
}Using ULIDs in a Next.js + Zustand App
import { create } from "zustand";
import { ulid } from "ulid";
type Store = {
ids: string[];
addId: () => void;
};
export const useUlidStore = create<Store>((set) => ({
ids: [],
addId: () =>
set((state) => ({
ids: [...state.ids, ulid()],
})),
}));This works seamlessly with Next.js, TailwindCSS, ShadCN UI, and Zustand.
ULID Best Practices
- Use ULID as primary keys for write-heavy systems
- Prefer ULID over UUID v4 for sorted data
- Avoid regenerating ULIDs on updates
- Store as CHAR(26) or VARCHAR(26) in SQL
FAQs About ULID
Is ULID better than UUID?
Yes, for most modern applications that need ordering and performance.
Are ULIDs secure?
ULIDs use 80 bits of randomness, making collisions extremely unlikely.
Can ULIDs be generated on the client?
Yes. ULIDs are safe for frontend and backend usage.
Are ULIDs sortable?
Yes, lexicographically and chronologically.
Where can I generate ULIDs online?
Use the fast tool on this page
Final Thoughts – Why ULID Is the Future
ULID is a developer-friendly, scalable, and production-ready identifier that outperforms UUID in many real-world systems.
If you need speed, order, and clarity, ULID is the right choice.
👉 Generate ULIDs instantly using the tool above