Whenever you need to save a full-page screenshot, there’s no need to make several screenshots or make your browser window unbelievably large.
Open the Developer tools with Cmd + Option + J on Mac, or Ctrl + Shift + J on Windows or Linux.
After that, open the command prompt using Command + Shift + P (Mac) or Control + Shift + P (Windows / Linux) and start typing Capture full size screenshot.
Hit it and you should instantly download a PNG screenshot of the full page!
Did you know that I made an in-browser image converter, where you can convert your images without uploading them anywhere? Try it out and let me know what you think. It's free.