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When I take a screenshot in macOS Mojave, I get a handy screen with Markup tools to edit the screenshot. But I’ve never been able to get the “highlight” feature to work.

I want to highlight text on a page in yellow, similar to a highlighter pen. It looks like it should do it, but the highlighter tool is always disabled. Nothing I do seems to enable it.

Does this tool work? How can I use it?

enter image description here

  • A screenshot contains no text, it's a picture. – Tetsujin Sep 9 '19 at 18:28
  • Why is that tool shown when I take a screenshot? It should be able to overlay a yellow mark on part of the screenshot, right? – Nate Sep 9 '19 at 18:31
  • There is no way the tool can identify text or any other 'human readable' attribute. It's just a picture. It knows it's a picture, so it greys out the text tools. It doesn't remove them, muscle-memory. – Tetsujin Sep 9 '19 at 18:32
  • Sure, I don’t expect it to recognize that it’s text and highlight the literal text, I want it to put a yellow mark over the text. For comparison, a highlighter pen that you use on paper doesn’t need to identify text. You can swipe it over the area and it makes a (not perfect but fine) yellow semi-transparent rectangle. – Nate Sep 9 '19 at 18:34
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    You're pointing to the highlight tool which is for text only. It will not be enabled for something where there's no text. You need to use the yellow-filled rectangle tool or a a 3rd party tool to do what you want. – fsb Sep 9 '19 at 18:53
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You can open the image with Preview and build your own sticky. Under the Tools menu go to Annotate and select a rectangle. Adjust size of rectangle and then set fill color to yellow and the line color to none. This results in a yellow rectangle. Now under Annotate select text. This puts a small text box on your image. Move this to inside yellow box and type in your own text. Now save the file as a jpeg or whatever you like and your image will have a yellow sticky on it. This maybe be to long a process for you but it works. See image below for an example.

enter image description here

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