Do Generator

ULID Generator

Generate ULIDs (Universally Unique Lexicographically Sortable Identifiers). 26 characters, URL-safe, time-sortable, and compatible with UUIDs.

100% Secure - Generated Locally in Your Browser
Time Sortable URL Safe 48-bit Timestamp

Generate ULID

Create sortable unique identifiers

Generated ULIDs

Click "Generate ULIDs" to create unique identifiers

Related Tools

6+

UUID Generator

Generate RFC 4122 compliant UUIDs in multiple versions with cryptographically secure random generation and bulk support

Python Random Number Generator

Learn how to generate random numbers in Python using random, secrets, and numpy modules. Interactive code examples with live execution and output demonstration

Crontab Generator

Generate crontab expressions with an intuitive visual interface for Linux/Unix task scheduling

C++ Random Number Generator

Learn how to generate random numbers in C++ using rand(), srand(), <random> library, and std::uniform_int_distribution(). Interactive code examples with detailed explanations

Java Random Number Generator

Learn how to generate random numbers in Java using java.util.Random, SecureRandom, ThreadLocalRandom, and Math.random(). Interactive code examples with detailed explanations

Password Generator

Generate secure, strong passwords with customizable length, character sets, and security options for maximum protection

ULID Structure

Each ULID consists of two parts: timestamp and randomness

TIMESTAMP (10 chars) RANDOMNESS (16 chars)

01ARZ3NDEKTSV4RRFFQ69G5FAV

Example: This ULID was generated at a specific millisecond and includes 80 bits of randomness

Timestamp (48 bits)

Milliseconds since Unix epoch (1970-01-01). Provides time-ordered sorting and lasts until 10889 AD.

Randomness (80 bits)

Cryptographically secure random value. Provides 1.21 quintillion unique IDs per millisecond.

Technical Specifications

ULID is designed to be sortable, URL-safe, and compatible with UUIDs

Features

  • Cryptographically secure randomness
  • Client-side generation only
  • Lexicographically sortable
  • No special characters (URL-safe)

Specifications

  • 26 characters (128 bits)
  • Crockford's Base32 encoding
  • 48-bit timestamp + 80-bit randomness
  • 1.21M IDs per millisecond