Browser Measurement Collector

What this collects

• Your browser's user-agent, language and platform
• Screen size, window size and display scaling (devicePixelRatio)
• GPU name and WebGL capabilities
• Which fonts are installed, and exact text measurements
• Canvas and audio rendering output
• Timezone

Together this is enough to recognise your specific machine. It does not read your files, browsing history, cookies, passwords, or anything you type. The result is sent back to the person who shared this link with you. Only run it if you agreed to share it with them.

Before you run it

Set browser zoom to 100% (Ctrl+0). Zoom changes the display scaling and makes every measurement unusable. Keep this tab in the foreground — it runs on its own and takes about a second.

Summary