🔷 What is a ULID Generator?
A ULID Generator is a simple tool designed to create ULIDs (Universally Unique Lexicographically Sortable Identifiers). ULIDs are a modern alternative to UUIDs, offering both uniqueness and time-based sorting by combining a timestamp with random bits.
Online ULID Generator Tool
Generate unique, time-sortable identifiers instantly
History
What is a ULID? (Universally Unique Lexicographically Sortable Identifier)
A ULID is a modern alternative to UUID (Universally Unique Identifier) that not only guarantees global uniqueness but also ensures that the IDs are sorted by time. ULIDs are 26-character strings with embedded timestamps, making them ideal for databases, logs, and systems where chronological order matters.
Why Use ULID Over UUID?
- 🔐 More readable and compact (Base32 format)
- 🕒 Time-based ordering
- 🚀 Fast and efficient
- ✅ Ideal for modern web applications
Use our free ULID Generator Tool above to instantly create secure, unique ULIDs for your project. Works offline, online, and is fully mobile-friendly.
Frequently Asked Questions
What makes ULIDs different from UUIDs?
ULIDs combine a timestamp with randomness, ensuring both uniqueness and sortability. They use a more compact Base32 encoding (26 characters) compared to UUIDs (36 characters) and are designed to be lexicographically sortable.
Are ULIDs secure for use in applications?
Yes, ULIDs are cryptographically secure when implemented correctly. They use random values that make them unpredictable and suitable for public-facing applications.
Can I use ULIDs as database primary keys?
Absolutely! ULIDs are excellent as database primary keys because they’re unique, sortable by creation time, and don’t expose sequential information that could be exploited.
Do ULIDs work offline?
Yes, ULIDs can be generated entirely client-side without requiring a server connection, making them perfect for offline-capable applications.
🔷 About ULID Generator
ULIDs are unique identifiers generated using a combination of time and randomness. They differ from UUIDs in several key areas:
- ✅ 128-bit compatibility with UUIDs
- ⚡ Can generate 1.21e+24 ULIDs per millisecond
- 🕒 Lexicographically sortable by timestamp
- 🔡 26-character Base32-encoded string (more compact than 36-character UUIDs)
- 🌐 URL-safe (no special characters)
- 🅰️ Case-insensitive
- ⏳ Monotonic order support for same-millisecond generation
📖 Official ULID Spec: https://github.com/ulid/spec
ULID Generator – Professional Unique Identifier Tool
🔷 How to Use the ULID Generator
- Choose generation method (Default / Time Seed / Monotonic)
- Enter seed time (optional, used for custom timestamp)
- Click “Generate ULID”
- Select quantity (generate from 1 to 100 ULIDs at once)
🔷 ULID Generation Methods
✅ Default
Uses current time + cryptographically secure random bits.
🕓 Time Seed
Allows specifying a seed time. The timestamp portion will remain constant for repeated inputs, while the random portion ensures each ULID remains unique.
📈 Monotonic
Generates ULIDs with strictly increasing order using the same seed time by incrementing the least significant bits, useful for ordered logging and databases.
ULID Generator
✅ Key Features of ULID:
- 128-bit identifier (same size as UUID)
- 1.21e+24 possible ULIDs per millisecond
- Sortable by timestamp (great for logs and databases)
- Base32 encoded: Only uses safe characters, no special symbols
- Case-insensitive: Makes search and use easier
- Compact: 26 characters instead of UUID’s 36
- Monotonicity: Generates strictly ordered ULIDs within the same millisecond
⚙️ ULID Generation Methods:
- Default Generation:
Combines current time in milliseconds with securely generated random bits using a cryptographic algorithm. This ensures both uniqueness and sortability. - Time Seed Mode:
Lets you input a specific timestamp. ULIDs generated with the same seed time will have the same timestamp portion but different random parts — useful for testing and simulations. - Monotonic Mode:
When you need strictly increasing ULIDs generated at the same time, this mode ensures that the lower bits are incremented properly — ideal for logs or order-sensitive records.
👨💻 How to Use the Tool:
- Choose a generation method (Default, Time Seed, or Monotonic)
- Optionally enter a timestamp
- Select how many ULIDs to generate (1 to 100)
- Click the Generate ULID button
- Copy, download, or reuse the ULIDs as needed
This tool is fast, secure, and mobile-friendly, designed to work both online and offline. Whether you’re a developer, database admin, or student, this generator helps you produce unique IDs with precision and simplicity.
