How to Launch and Use Grab Utility on macOS and Mac OS X?

Many Mac users are already familiar with the Utility folder and the useful tools. Some of these apps are helpful when seeking solutions to problems you may have encountered. Among these apps is Grab, which is based on capturing a computer screen image.

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Your Mac has built-in functions for screen capturing. They are reached through keyboard combinations such as Command, Shift, and 3 or 4. However, the Grab app is more powerful and includes different image formats, a timer screenshot function, and more. This article will cover all types of screenshots, how to set up the Grab app to deliver good-quality images, and troubleshooting steps when things don't go your way.

Video showing How to Use Grab Utility on Mac

Table of Contents:

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Version

Capabilities of Grab

As mentioned, the Grab app has higher functionality than Mac's built-in screenshot function - here is a clear view of its potential:

It can capture just a portion of the screen.

Takes an image grab of a selected window.

Performs a Timed Screenshot. This function allows you to take a screengrab after 10 seconds.

Allows you to select a type of pointer (cursor) and show or hide it in screenshots. To set pointer settings, open Grab Preferences and select the type of pointer, or disable it.

Takes a picture of the entire screen, including multiple-monitor screens.

Saves pictures in various image formats such as JPEG, PNG, and TIFF.

Owns a small 'tooltip' displaying the exact coordinate of your pointer, which transforms into the number of pixels selected when selecting an area.

Use of the Grab Utility

This app has a simple interface. However, some steps might be confusing. Here, we walk step-by-step through all Grab functions.

There are several ways to launch the app. As mentioned above, the app is within the Utilities folder, so we can use Spotlight, Launchpad, or Finder to start to Grab. In Finder, go to Applications, choose Utilities, and select Grab. In the Launchpad, Grab is within Other.

Take a screenshot of the selected area on your screen

1. When the app is launched, click on Capture on Grab's menu at the top of your screen.
2. Then choose Selection or simply press Shift, Command, and A together on your keyboard. You will notice Grab's information message.
3. Now, select your desired area by dragging with your mouse.

When you have finished selecting, the picture will appear in a new window to save the image in a specified destination folder with a filename you provide.

Take a picture of the desired window

1. Select Capture from Grab's menu.
2. Then choose Window or simply press the keyboard shortcut Shift, Command, and W.
3. In the popped-up window, click Choose Window.
4. Left-click to select the window required to capture, and then save it.

Capture your entire screen

1. Select Capture from Grab's menu.
2. Choose Screen, or simply press the Command and Z keyboard combination to start capturing the whole screen.
3. An information message will pop up stating that the image will be taken when you left-click the screen anywhere (outside the message).

Perform a timed screenshot

1. To launch a timed screenshot function, go to Capture in Grab's menu.
2. Choose Timed Screen or use the keyboard shortcut Shift, Command, and Z.
3. The activation window will pop up and leave 10 seconds before capturing from the moment you clicked Start Timer.

This function will take a picture of the entire screen - it is handy when you need to take a screenshot of menus or menu options.

Check the details of the taken screenshot

1. To look up information about the screen capture, click Window.
2. Choose Inspector, or simply press Command and 1 together.

This information is available before the image is saved, so you can check the dimensions and file size with the TIFF format, which is the default Grab format for screen captures. You can change this format when you are not saving the screenshot.

Image quality

It is often useful to change the resolution of an image. The Grab app usually captures images at high resolution. However, this is restricted to your display resolution. To achieve a better quality of screenshots, ensure your display is at the highest available resolution.

1. To change your device display resolution, open Mac's SystemPreferences.
2. Choose Displays.
3. Check that the display is set to the highest number of pixels available.

Change default screenshot format

The default format when saving captures is generally PNG and can be changed easily using a terminal and a few simple commands. Mac supports PNG, JPG, TIFF, GIF, and PDF formats, so you can choose any of these. Launch Terminal, which is under the Utilities folder, or use Spotlight.

To set JPEG, enter the Terminal command: defaults write com.apple.screencapture type jpg

To set TIFF, enter: defaults write com.apple.screencapture type tiff

To set GIF, type: defaults write com.apple.screencapture type gif

To set PDF, type: defaults write com.apple.screencapture type pdf

If you wish to return the format to PNG, type: defaults write com.apple.screencapture type png

The changes will not take effect until you restart the Mac. Alternatively, you can use the additional terminal command: killall SystemUIServer

The Mac will then be forced to reboot, and the system will use the new settings.

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Grab utility stopped working after the macOS update

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Occasionally, the app might fail to work after a system update. This issue can be due to a corrupted Grab preference file. To see if this is the case on your system, follow the steps below:

1. Open Finder, choose Go from the Finder's menu at the top of your screen, and select Go to Folder.
2. Then, enter the following path: ~/Library/Preferences/com.apple.grab.plist
3. Move the selected file to Trash or your Desktop and restart the Mac.
4. Once the computer has completely rebooted, attempt to relaunch Grab.

If this step helps, delete the old preference file. Otherwise, try reinstalling the Grab app using macOS Recovery. If none of these solutions fixes the problem, you could reinstall macOS.

Detailed steps on how to reinstall macOS.

Grab For Mac

An alternative method to take a screenshot on the Mac is to use the built-in screenshot function.

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Agree with Stephan2nd: A very handy app. With these screen capture applications, it is always asked 'Why not use the built-in Command-Shift-3 or 4'. Well, that built-in utility can copy to the clipboard instead of a file by adding a control key (e.g. Control-Command-Shift-3 or 4). But, the built in routine will not let you copy the clipboard to a file. Grabit does by 'Grab image on Clipboard', then saving the floating image to a file.
The ability to grab a screenshot and have the image float above everything else is a wonderful thing; you don't have to go look at a file to see if you capture exactly what you wanted. You copy an image from a browser window by Control-clicking on a image and using the drop down menu to Copy, then use the Grabit command to make a capture from the Clipboard.
Finally you can do multiple screen captures of various images and have them all float in full size or thumbnail style like Stickies text notes. You can also show or hide them with a Grabit menu command.
One thing that I would like to see is to have a library window that holds all the captures, say a hundred or so. SnappyApp is one example of a screen capture utility that does this.
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