ULID (Universally Unique Lexicographically Sortable Identifier) is a 26-character string format that combines a timestamp with random data to create identifiers that are both unique and sortable by creation time. ULIDs are an alternative to UUIDs with better sorting capabilities.

Why use ULIDs instead of UUIDs?

ULIDs offer several advantages over UUIDs: they are lexicographically sortable by generation time, they use a more compact representation (26 characters vs 36 for UUIDs), they're case-insensitive, and they avoid problematic characters like hyphens.

How do I convert a UUID to a ULID?

You can convert a UUID to a ULID using our UUID Converter tool. Simply paste your UUID into the input field and click Convert. The tool supports UUID v1, v4, v7, and any hex string, converting them losslessly to ULID format and back.

Can I decode a ULID to see its timestamp?

Yes, you can decode a ULID using our ULID Decoder tool. It will show you the timestamp in various formats (Unix timestamp, ISO string, human-readable date) and the random component in different representations.

Are ULIDs suitable for database primary keys?

Yes, ULIDs are excellent for database primary keys. They're sortable by creation time which improves database performance, they're URL-safe, and they can be generated without a central coordinator, making them ideal for distributed systems.

What is NanoID and when should I use it?

NanoID is a tiny, secure, URL-friendly unique string ID generator. It's smaller and faster than UUID and is ideal for generating short unique IDs for URLs, session tokens, or any situation where a compact random identifier is needed. Unlike ULID, NanoID is not time-sortable.

What is a Snowflake ID?

Snowflake ID is a 64-bit unique identifier format originally developed by Twitter. It encodes a timestamp, datacenter ID, machine ID, and sequence number. Snowflake IDs are sortable by time, extremely fast to generate, and widely used in distributed systems like Twitter, Discord, and Instagram.

How do I decode a JWT token?

Paste your JWT token into our JWT Decoder tool to instantly see the decoded header, payload, and signature. The tool shows all claims including expiry time (exp), issued-at (iat), and custom claims. No data is sent to any server - decoding is done entirely in your browser.

What is CUID and CUID2?

CUID (Collision-resistant Unique Identifier) is designed for horizontal scalability and sequential IDs for databases and distributed systems. CUID2 is the improved next generation with better security and randomness properties. Both are excellent alternatives to UUID for Node.js applications.

Database Schema & ID Regex Generator

Generate customized B-Tree index optimized SQL schemas and matching regular expression snippets to validate identifiers like ULID, UUID, CUID, NanoID, or Snowflake.

Database Schema & Regex Generator

Generate optimized database schema designs, DDL, indices, and backend validation patterns for unique IDs.

Identifier Type

Target Database

Column Options

Primary KeyCreate Index (B-Tree/Unique)Nullable (Allow NULL)

Generated SQL DDL

Regex & Validation Code

Why Optimize DB Storage for Identifiers?

Unique identifiers like ULID and UUID are 128-bit values. Storing them as standard string `VARCHAR(36)` is easy but causes massive indexing overhead and performance degradation in databases like PostgreSQL or MySQL. Storing UUIDs natively or ULIDs as `BINARY(16)` reduces storage size by over 50% and speeds up indexing significantly.

Regex Validation Importance

Validating unique IDs at the API gateway or backend boundaries prevents SQL injection, invalid database queries, and bad data formatting. Pre-compiled regex patterns allow high-performance validation at scale.

Free Online Developer Tools - ULID, UUID, NanoID, CUID, Snowflake ID, JWT Decoder, Base64, JSON Formatter & More

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Database Schema & ID Regex Generator

Database Schema & Regex Generator

Why Optimize DB Storage for Identifiers?

Regex Validation Importance