What a tunnel can change
The address this site sees can change. A server-reflexive WebRTC address can change if the VPN handles WebRTC. It might not.
Candidates are listed on the WebRTC test. Compare before and after you connect, in the same tab.
What usually stays
Canvas, WebGL, fonts, language, screen, and time zone do not travel through the tunnel. They are measured locally.
That is why the fingerprint can stay after the IP changes.
What we will not claim
No brand is ranked here. A VPN is not a promise that a site cannot recognize the browser.
If the vendor does not cover IPv6, an IPv6 path can remain. The test reports what it saw. It does not certify the product.
Common questions
Should the page tell me which VPN to buy?
No. Use the before/after control on your own setup.
Does the VPN hide file metadata?
No. GPS in a photo is in the file. See browser privacy versus file metadata.