How to take screenshots with required resolution on MacBook
Problem
You can take screenshots with required resolution, such as 1920 x 1080, on Windows machines but not Mac OS.
Because Mac OS only supports resolutions that have the same ratio of 16 x 10 with their physical screen.
Resolution
Choose the largest supported resolution, use browser dev tool to take the screenshots with expected resolution.
Guide
1. Choose the largest supported resolution of your MacBook
The default display options are as follows:
Toggle the "Show all resolutions" option, then you can more resolution options.
Choose 2560 x 1600 that can cover the required 1920 x 1080 resolution.
2. Use the browser developer tool to take the screenshots with expected resolution
Open the developer tool of the browser > toggle device emulator
Dimension options > Edit
Add custom device or edit an existing device settings, and make sure the resolution is 1920 x 1080 and Desktop as the user agent:
Confirm the result resolution of 1920 x 1080 with 100% zoom.
3. Use CMD+Shift+P dev tool command to "Capture screenshot":
The taken screenshot in PNG format is less blurred than JPEG format, but the dev tool command sometimes does not work.
Do not choose the "Capture full size screenshot", otherwise, the full page will be captured and may not fit the expected resolution.
4. [OPTIONAL] Take the screenshot with browser feature and crop it if necessary
On Edge, you can use the top right browser menu option or shortcut of Shift+CMD+S to take screenshot.
Choose the option of "Capture Full Page" then double check what you got.
Sometimes, the taken full page screenshot covers the whole page but not only the visible part.
You can use the Mac OS default Preview tool to select and crop the part you need from the full page screenshot.
Draw a rectangle, make sure its height is 1080 and its left and right sides are over the left and right edges of the screenshot.
Finally, confirm the result of the cropped screenshot meets the resolution requirement.
Note that the screenshot taken this way is in JPEG format, which could be blurred and not as clear as the PNG format.