2016-9-9 How to Compress Photos on Mac Using Third-party App? Cisdem BetterUnarchiver is the Mac Unarchiver and archiver that lets you batch compress files, preview the contents inside archives and unzip (entirely or partially) archive files on Mac. With this app, you can Open RAR, Zip, 7-zip, ISO, Udf, Wim, TAR, CHM, Hfs, Nsis, Udf files on Mac. Mar 29, 2019 How to Resize Pictures (for Macs). Resizing an image on your Mac is simple with Preview, a free image utility that comes pre-installed on OS X. Preview helps you crop images easily and adjust their dimensions without having to install. May 07, 2015 How-To: Safely shrink your Mac’s giant photo library, deleting duplicate images to save space. Trimming down your Mac’s photo library. Mar 02, 2013 Shrink or Reduce a Photo File Size on Mac? March 2, 2013 / Dave Taylor / Computer and Internet Basics / 1 Comment I’m trying to upload some photos to a social media site and it’s complaining that they’re too big. 2020-1-11 Is the 'Importing: Copy items to the Photos Library' active? If not, deleting photos will not reduce the library size much, since the original photos are stored outside the library and will not be deleted, when you delete photos. To check for referenced files, create a smart album with the rule 'Photo is Referenced'. Are there photos on this album? Apr 22, 2015 How to use multiple photo libraries with Photos for Mac. Photos for Mac lets you work with multiple libraries. Learn how to choose a default library, open another library, and merge multiple.
Preview User Guide
You can resize or rotate an image opened in Preview to fit into a particular spot. You can also reduce the file size to save disk space or to download an image more quickly.
Change an image’s dimensions
In the Preview app on your Mac, if the Markup toolbar isn’t showing, click the Show Markup Toolbar button , then click the Adjust Size button .
Enter new values for width and height, or click the “Fit into” pop-up menu and choose a size.
Resize the image by a percentage: Choose “percent” from the pop-up menu next to the Width and Height fields, then enter the percentage in those fields.
Force the image to keep its original proportions: Select “Scale proportionally.” If you change either the width or height, the other value changes to maintain the proportions. If you choose a size from the “Fit into” pop-up menu, the image’s width or height may be smaller than the chosen size to maintain the proportions.
Make the image’s dimensions smaller without losing any detail: Deselect “Resample image” before changing the width or height.
Tip: To resize multiple images at the same time, display the images in the same window, select them in that window’s sidebar, then choose Tools > Adjust Size.
Rotate or flip an image
In the Preview app on your Mac, open the file you want to change.
Do any of the following:
Rotate an image: Select the image, then click (or use the Touch Bar) to rotate the image to the left. Continue clicking to keep rotating.
To rotate the image to the right, press and hold the Option key, then click until you’re done rotating the image.
Flip an image: Choose Tools > Flip Horizontal or Flip Vertical.
Backup Photo Library Mac
Tip: To rotate or flip multiple images at the same time, display the images in the same window, choose View > Thumbnails, select them in that window’s sidebar, then choose Tools > [Rotate or Flip].
Mac Photos Library Location
Reduce an image’s file size
In the Preview app on your Mac, open the file you want to change.
Choose Tools > Adjust Size, then select “Resample image.”
Enter a smaller value in the Resolution field.
The new size is shown at the bottom.
Photo Library Mac
Tip: To reduce the file size of multiple images at the same time, display the images in the same window, select them in that window’s sidebar, then choose Tools > Adjust Size.