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.

Privacy Policy

Last updated: May 30, 2026

ULIDTool.net is a 100% client-side developer tool. We take privacy seriously — your data never leaves your browser.

1. What We Collect and Analytics

All core tool processing happens entirely inside your web browser (client-side) using secure APIs. We do not store your generated IDs, code, or tokens on any server. However, we use standard analytics to monitor and optimize website performance:

Theme preference and configuration: Stored in your browser's localStorage for your convenience.
Generation history: Stored locally in your browser, never sent to any server.
Google Analytics 4 (GA4): If you consent via our banner, Google Analytics is loaded to track page views, feature usage, and overall traffic to help us improve this free tool. You can opt-out at any time.
Cloudflare Web Analytics: We use privacy-first, cookie-less Cloudflare Web Analytics to measure site performance and visitor numbers without tracking individual users.

Privacy Commitment: We respect your choices. Google Analytics cookies are disabled by default and only loaded if you explicitly accept them. Cloudflare Web Analytics runs entirely cookie-free and without personal tracking.

2. Cryptographic Randomness

All ULIDs, NanoIDs, and other identifiers are generated using crypto.getRandomValues() — the browser's built-in cryptographic random number generator. Generated values are never logged or stored on any server.

3. Third-party Services

We use a few trusted infrastructure providers to deliver the website:

Cloudflare Pages: Hosts the static website. Cloudflare may log standard access logs (IP, user agent) as part of CDN operation — see Cloudflare's Privacy Policy.
Buy Me a Coffee: Optional donation link — their privacy policy applies if you click it.
CDN libraries: Monaco Editor and other JS libraries are loaded from public CDNs. No personal data is shared.

4. localStorage Data

You can clear all locally stored data at any time:

Open browser DevTools → Application → Local Storage → Clear
Or clear your browser's site data for ulidtool.net

5. Children's Privacy

This service is not directed at children under 13. We do not knowingly collect any data from children.

6. Changes to This Policy

If we add advertising, changing analytics, or change data practices, we will update this page and the "Last updated" date prominently before making any changes.

7. Contact

Email: [email protected]

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

Tools Menu