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About this tool
See the resolution, pixel ratio, colour depth and window signals every website can read from your display.
Screen and Display Fingerprint Viewer shows the display readings every website can take without a permission prompt: screen width and height in CSS pixels, available area, device pixel ratio, colour depth and current viewport. Each reading is labelled stable or session-only and marked as common or distinctive against widely reported values, and the stable set is hashed with FNV-1a into a short id so you can watch the same combination reproduce on every reload. It is for anyone who wants to see what browser fingerprinting actually collects before deciding whether to change anything.
Open Screen and Display Fingerprint Viewer on AltFTool — it loads instantly in your browser.
Add your input to the workspace.
Adjust the options until the result looks right.
Copy or download the output and put it to work.
Screen size and pixel ratio survive reloads; viewport size does not, which is why trackers weight them differently.
The short id uses FNV-1a, which matches its published test vectors, so the same display always produces the same value.
Every row says what the number means, from reserved taskbar height to the physical pixel grid behind CSS pixels.
Yes. window.screen and window.devicePixelRatio are readable by any script on any page, with no prompt and no consent step, which is why display readings appear in almost every fingerprinting script.
24 is what nearly every browser returns, and the CSSOM View specification allows it: Firefox's resist-fingerprinting mode and Safari report 24 unconditionally. Because it is near-universal it adds almost nothing to a fingerprint.
It changes only the session-level readings. The stable ones — screen size, available area and pixel ratio — stay the same across resizes and reloads, so resizing alone does not break a display fingerprint.
A ratio like 1.25 or 1.5 usually means OS display scaling or browser zoom rather than the hardware itself; phones commonly report 2, 2.625 or 3. Values away from the standard set are more distinctive because fewer machines report them.