The developer-friendly tool for creating RFC4122-compliant UUIDs. Secure, customizable, and always available.
Get ID NowAll IDs are generated locally in your browser. No data is ever sent to our servers.
Generate RFC4122 v4 UUIDs. Customizable with hyphens, braces, and case options.
Go to UUID Generator →Microsoft-style GUIDs pre-configured with uppercase and braces for registry/config use.
Go to GUID Generator →| Category | Recommended ID | Reason |
|---|---|---|
| Internal Database (High Performance) | Snowflake ID, BigInt, ULID, UUID v7 | Optimized for indexing speed and storage efficiency. |
| Distributed Systems / Microservices | Snowflake ID, UUID/GUID, PushID | Prevents ID collisions when multiple servers generate data simultaneously. |
| Public API & User Facing (User Friendly) | TypeID, NanoID, Sqids/Hashids | Human-readable, URL-safe, and hides the actual record count. |
| High Security (Anti-Guessing) | CUID2, NanoID | Highly random and difficult for attackers to guess patterns. |
| Language Specific Optimization | XID (Go), PushID (Firebase), MongoDB ObjectId | Specially designed for performance within their specific ecosystems. |
| ID Type | Size (Bit) | Size (Byte) | Best Use Case |
|---|---|---|---|
| UUID | 128 bit | 16 byte | World standard. Suitable if your application is used by many people in various locations. |
| GUID | 128 bit | 16 byte | Specifically if you are using Microsoft systems (Windows/SQL Server). |
| ULID | 128 bit | 16 byte | Similar to UUID but sortable. Great for databases to keep search fast. |
| Snowflake ID | 64 bit | 8 byte | Used by Twitter/Discord. Pure numbers, suitable for giant systems. |
| MongoDB ObjectId | 96 bit | 12 byte | Must use if the database is MongoDB. |
| BigInt (64-bit) | 64 bit | 8 byte | Sequential numbers (1, 2, 3...) for large-scale applications with massive data. |
| NanoID | Variable | Variable | Suitable for short links (like bit.ly) or user-facing IDs. |
| Integer (32-bit) | 32 bit | 4 byte | Simplest. Suitable for item IDs, user IDs, or small category data. |
| TypeID | ~128 bit | ~16 byte | Modern ID with label (e.g. user_...). So programmers don't get confused what ID this is. |
| CUID2 | Variable | Variable | Made specifically for modern web. Very secure, collision-resistant, and hard to guess. |
| Hashids | Variable | Variable | Not a pure ID. Only hides real numbers (e.g. ID 1 becomes X9) so data count is hidden. |
| XID | 96 bit | 12 byte | Special for Go language (Golang). Very fast for high-performance systems. |
| PushID | 120 bit | 20 byte | Created by Firebase. Chronological IDs, keeping real-time data organized. |
| KSUID | 160 bit | 20 byte | Most precise time ordering. Commonly used for giant system logs. |
| Sqids | Variable | Variable | New version of Hashids. Can encode multiple numbers into one unique code. |