UUID Builder

UUID Builder is a free online UUID/GUID generator built for developers, backend engineers, API builders, database users, and indie hackers who need reliable unique identifiers without installing packages or writing temporary scripts.

The tool supports multiple UUID versions, including UUID v1, v3, v4, v5, and v7. This makes it useful for many real-world development workflows. Developers can use UUID v4 for simple random identifiers, UUID v7 for modern time-sortable identifiers, or namespace-based UUID versions when deterministic IDs are needed. UUID Builder helps users quickly generate identifiers for API resources, database primary keys, distributed systems, background jobs, queues, uploads, invitations, temporary records, test data, fixtures, prototypes, and automation workflows.

UUID Builder is designed to be simple and fast. Users can generate single UUIDs or create UUIDs in bulk, then copy the results or download them as a text file. The tool also includes UUID version comparisons and code examples for popular programming languages, helping developers understand which UUID format is better for their specific use case.

Unlike many basic UUID generators that only support UUID v4, UUID Builder is positioned as a more complete identifier toolkit. It is especially helpful for developers working with modern databases, APIs, SaaS products, internal tools, and distributed applications where identifier format can affect ordering, indexing, debugging, and data design.

The product is free to use, requires no signup, and runs directly in the browser. It is a small but practical developer utility for anyone who regularly works with IDs, backend systems, databases, or test data.

Key features

• Generate UUID v1, v3, v4, v5, and v7.
• Bulk UUID generation.
• Copy UUIDs instantly.
• Download generated UUIDs as .txt.
• Compare UUID versions.
• Learn when to use UUID v4 vs UUID v7.
• Code examples for popular programming languages.
• Useful for APIs, databases, test data, jobs, queues, and distributed systems.
• No signup required.
• Free to use.