Google Chrome has a hidden feature in the Developer Tools that lets you create screenshots of any original size web page. This feature captures the entire contents of a page, similar to scrolling a screenshot, without the use of a third-party extension.
How to Make a Full Screen Screenshot in Chrome
First, open Chrome and navigate to the webpage you want to capture. Click on the three dots there, point to More Tools, and then click Developer Tools. Alternatively, press Ctrl + Shift + I on Windows or Command + Shift + I on Mac to open the Developer Tools panel.
Click the three-dot icon in the upper-right corner of the window, then click Run Command. Alternatively, you can press Ctrl + Shift + P on Windows and Command + Shift + P on Mac.
Enter "Screenshot" at the command line and click "Record full size screenshot" in the list. Number of available commands.
Note: This feature is ideal for text-based content sites, as opposed to Web applications, because only this content may be usable. Take the visible screen.
The image should be automatically saved when you are prompted to save the image Select a destination on your computer and click Save.
Done. After the screenshot is saved, you can open it with an image editor, add annotations, or crop to a specific size.