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To take ‘full screen’ screengrabs easily, use the Chrome browser and install: Full  Page Screen Capture

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Mark-up screengrabs really easily on your Mac by using: Preview > Annotate
The annotation menu options open – it’s very easy to use and easier to mark-up with if you don’t have Adobe Acrobat.

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And to create quick wireframes, a free softare to install is: Pencil (Evolus Pencil) which is free to download here: pencil.evolus.vn

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