UUIDTools
Last updated October 7, 2026
About UUIDTools
UUIDTools.online is a free set of UUID and GUID utilities for developers. Generate, validate, format, and decode identifiers in the browser, with no account required.
The suite covers UUID versions 1, 4, and 7, including random and time-ordered values, plus bulk output for tests and sample data. A validator checks structure, a formatter switches case and hyphens, and a decoder shows the version, variant, and hexadecimal parts. Sayeed Alam publishes the tools for everyday API, database, and distributed-system work.
UUID v4 is the random general-purpose choice. UUID v7 adds a Unix timestamp so identifiers can be ordered by time. The site explains how those versions differ and links a public GitHub collection of UUID developer resources for storage, formatting, and API usage.
Key features
- Generate UUID v1, v4, and v7 identifiers in the browser
- Validate, format, and decode existing UUID values
- Create bulk identifiers for tests and sample data
- Read the public GitHub notes on UUID versions and storage
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