Browser information explained

What websites can read

Common browser signals include user agent, platform, preferred language, screen size, viewport size, color depth, cookie support, online status and sometimes connection hints. These values help websites choose responsive layouts, troubleshoot compatibility problems and understand broad device categories.

The user agent string often includes browser name, rendering engine, operating system and device family. It is useful for debugging, but it can also be simplified, frozen or modified by privacy tools.

Privacy and accuracy

Browser information alone usually does not identify a person, but combined with IP address and other signals it can contribute to fingerprinting. Privacy-focused browsers, extensions and VPNs may reduce or alter some values. Developers should use these details carefully and avoid relying on them as the only source of truth.