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Reduce exact pixel ratios, scale dimensions and calculate contain/cover layouts.
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Files and inputs stay on your device. Use Reset to clear this workspace.
Useful to know
What does this tool establish?
Uses square pixels and positive integer dimensions. 3440×1440 reduces to 43:18, even when marketed as 21:9. Fractional planned dimensions must be rounded to whole pixels.
Does this certify the screen?
No. Browser signals, calculations and visual observations cannot certify physical panel specifications or defects.
Where are my files and inputs processed?
Calculations and observations stay in this tab. Optional observation saving starts off and uses only this device. Turn it off or use Clear observation to remove that saved note. Downloaded reports remain on your device.
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