skim pdf

Hello everyone,

I am new to macOS devices, I bought Macbook pro M1, and when I installed Skim pdf, for pdf viewing, the app fails to work because Apple cannot check for malware; even after following their steps to overcome this problem, Skim still doesn't work.

Besides asking this, I would also like to know how to set it up directly in Vim editor, as the default viewer.

Posted on Jan 31, 2021 7:53 AM

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Question marked as Top-ranking reply

Posted on Jan 31, 2021 8:23 AM

Skim is a PDF reader based on the same Apple PDFKit framework as Apple's built-in Preview application. If you right-click on the Skim application and choose just Open, a verification progress bar will appear, and you may be told it is a third-party application and to Open it. Click Open.


However, with some applications, this does not work and it will tell you it cannot open it. Don't cancel, but do visit System Preferences > Security & Privacy > General panel. You should see in the Allow apps downloaded from section, that Skim appears there, and you can click open anyway. Once you have done that, the application will work as expected, or should.


Vim is a text editor and has nothing to do with viewing PDF. I suggest that you launch vim, and then do the following:


:help gx


That will provide the documentation that you need allowing you to configure your .vimrc/.gvimrc so you can hover your cursor over a PDF file name in a text document and open that PDF externally in either Skim, Preview, or Adobe Acrobat Reader. This can be used for other file types whose names may appear in a textual context.

27 replies
Question marked as Top-ranking reply

Jan 31, 2021 8:23 AM in response to antonello160

Skim is a PDF reader based on the same Apple PDFKit framework as Apple's built-in Preview application. If you right-click on the Skim application and choose just Open, a verification progress bar will appear, and you may be told it is a third-party application and to Open it. Click Open.


However, with some applications, this does not work and it will tell you it cannot open it. Don't cancel, but do visit System Preferences > Security & Privacy > General panel. You should see in the Allow apps downloaded from section, that Skim appears there, and you can click open anyway. Once you have done that, the application will work as expected, or should.


Vim is a text editor and has nothing to do with viewing PDF. I suggest that you launch vim, and then do the following:


:help gx


That will provide the documentation that you need allowing you to configure your .vimrc/.gvimrc so you can hover your cursor over a PDF file name in a text document and open that PDF externally in either Skim, Preview, or Adobe Acrobat Reader. This can be used for other file types whose names may appear in a textual context.

Jan 31, 2021 12:44 PM in response to antonello160

I see the issue:



Click on that OK button, and then immediately go to System Preferences > Security & Privacy > General panel. You will see the following:


Click the Open Anyway button. It will produce what at first glance, appears to be a discouraging dialog:



Click the Open button, and Skim launches presenting its release notes window. From this point forward, it behaves like a normal Mac application with a double-click launch, and also appears on the Finder's Open With > menu.

Jan 31, 2021 11:47 AM in response to antonello160

In the open Skim installer window, drag that Skim icon across and drop it on that Applications folder alias. That will install it. If you did this previously, the Finder will honk about replacing it. Do so.


Next, close that installer window, or just right-click on that Skim Desktop icon below MacVim, and from the secondary menu, select Eject "Skim". Rinse repeat with the Inkscape installer icon that is also on your Desktop. This isn't Windows, so why isn't MacVim in the Dock where mine lives?


Now that you have the cruft off of your Desktop, open a new Finder window, and click Applications in the Favorites list. Find Skim, right-click on it, and select Open. Let it verify and then present you with a dialog afterward. It will be a reminder that it is a third-party application and an Open button (which you will click). If it bails on you and offers a different dialog that appears that it wants you to quit — don't cancel it and then follow my previous instructions about the System Preferences > Security & Privacy panel to override allowing you to use Skim.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

skim pdf

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