Browser zoom changes the web page’s interface scale and can affect layout, but it does not necessarily change the video’s aspect ratio. The player has separate fit or full-screen behaviour. Check page zoom, operating-system scaling and player sizing independently before assuming the source resolution is wrong.
Find which layer changed
If navigation, captions and buttons all look larger across websites, browser zoom or system scaling may be involved. If only the video image is cropped, inspect the player’s fit setting. A television used as a computer monitor can add another layer of overscan or picture sizing on top of both.
Use accessible controls deliberately
Larger interface text can be useful and should not be removed automatically. Aim for a layout where controls remain reachable and the picture keeps its intended shape. Full screen can reduce surrounding page clutter, but keyboard focus and an obvious exit route should still work. Test those controls before settling into a long programme.
Keep the diagnosis specific
Report the browser, operating system, zoom level and whether the issue appears in full screen. A screenshot of the interface can help if it excludes private data. Do not describe large buttons as low video resolution: interface scale and encoded picture dimensions are separate properties and need different corrections.
