These instructions also work on Microsoft Edge (which is based on Chrome).
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On any page, press Ctrl + Shift + J (On Mac, Cmd + Shift + J)
This opens a new window containing Chrome’s "developer tools":
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Press Ctrl + Shift + P (On Mac, Cmd + Shift + P)
This should open a dropdown menu in the developer tools:
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Start typing 'screenshot'. Observe that a few menu options show up:
- "Capture screenshot" is the portion of the page that’s currently visible
- "Capture full size screenshot" is the whole page
- "Capture area screenshot" lets you drag to select a part of the page
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Chrome will download a screenshot
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If the screenshot is the wrong width, just change the width of the window. If the developer tools is taking up space, you can move it to a separate window by clicking the "kebab" button and then the "pop-out" button, as circled here: