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ULID生成器 - 专业唯一标识符生成工具
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ULID Generator - Professional Unique Identifier Tool with Time Sorting

What is ULID?

ULID (Universally Unique Lexicographically Sortable Identifier) is a modern alternative to UUID that combines the benefits of unique identification with lexicographic sorting capabilities. Unlike traditional UUIDs, ULIDs are designed to be:
  • Time-ordered: ULIDs generated later will sort after ULIDs generated earlier
  • Compact: 26 characters using Crockford's Base32 encoding
  • URL-safe: No special characters that need encoding
  • Case-insensitive: Reduces human error when manually handling
  • Monotonic: Within the same millisecond, ULIDs are guaranteed to sort correctly

ULID vs UUID Comparison

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Key Features

🚀 Batch Generation

Generate up to 100 ULIDs at once for bulk operations and testing scenarios.

📋 Multiple Output Formats

  • Raw Format: Plain ULID strings for direct use
  • JSON Format: Structured output for API integration

⚡ Instant Copy & Download

  • One-click copy to clipboard
  • Bulk select all generated ULIDs
  • Download results as text files

🔄 Real-time Generation

Instantly generate fresh ULIDs with timestamp precision down to milliseconds.

Technical Specifications

ULID Structure

01AN4Z07BY      79KA1307SR9X4MV3
|----------|    |----------------|
timestamp       randomness
(48 bits)       (80 bits)

  • Timestamp: 48-bit integer representing milliseconds since Unix epoch
  • Randomness: 80 bits of cryptographically strong random data
  • Total: 128 bits of data encoded in 26 characters

Character Set

ULIDs use Crockford's Base32 encoding with the following characters: 0123456789ABCDEFGHJKMNPQRSTVWXYZ
Note: Letters I, L, O, and U are excluded to avoid confusion.

Use Cases

🗄️ Database Primary Keys

Perfect for distributed databases where you need sortable primary keys without coordination.

🌐 API Identifiers

Ideal for REST API resource identifiers that need to be URL-safe and sortable.

📊 Event Logging

Excellent for log entries where chronological order is important.

🔗 Distributed Systems

Great for microservices that need to generate unique IDs independently.

📱 Mobile Applications

Suitable for offline-first apps that sync data later.

How to Use

Step 1: Set Generation Parameters

  1. Quantity: Choose how many ULIDs to generate (1-100)
  2. Format: Select output format (Raw or JSON)

Step 2: Generate ULIDs

Click the "Refresh" button to generate new ULIDs with current timestamp.

Step 3: Copy or Download

  • Individual Copy: Click the copy button next to any ULID
  • Select All: Use the select all button to highlight all generated ULIDs
  • Download: Save all results to a text file

Example Output

Raw Format

01HGW2N3K8QJ9X4M7V2P5R8T6Y
01HGW2N3K9A1B2C3D4E5F6G7H8
01HGW2N3KAZ9Y8X7W6V5U4T3S2

JSON Format

[
  {
    "id": 1,
    "ulid": "01HGW2N3K8QJ9X4M7V2P5R8T6Y",
    "timestamp": "2024-01-15T10:30:45.123Z"
  },
  {
    "id": 2,
    "ulid": "01HGW2N3K9A1B2C3D4E5F6G7H8",
    "timestamp": "2024-01-15T10:30:45.124Z"
  }
]

Why Choose Our ULID Generator?

✅ Free & No Registration: Use immediately without any signup ✅ Browser-based: No software installation required ✅ Mobile-friendly: Works perfectly on all devices ✅ Privacy-focused: All generation happens in your browser ✅ Professional-grade: Follows official ULID specification ✅ Developer-friendly: Multiple output formats for easy integration

Frequently Asked Questions

Q: Are ULIDs truly unique? A: Yes, ULIDs provide 128 bits of uniqueness with extremely low collision probability, similar to UUIDs.
Q: Can I use ULIDs as database primary keys? A: Absolutely! ULIDs are excellent for primary keys, especially in distributed systems.
Q: Are ULIDs sortable by creation time? A: Yes, ULIDs are lexicographically sortable by their creation timestamp.
Q: How many ULIDs can I generate? A: You can generate up to 100 ULIDs per batch. For larger quantities, simply run multiple batches.
Q: Are ULIDs case-sensitive? A: No, ULIDs are case-insensitive, making them more user-friendly than UUIDs.
Start generating professional ULIDs now with our free online tool!