Install 7-Zip for Windows. Once downloaded, double-click the installer and follow the on-screen instructions to install 7-Zip. Right-click the file or folder you want to compress. If you want to compress multiple files into one ZIP, you can add them to a folder and right-click that, or just hold down the Control key as you click each file, and then right-click the highlighted area.
Select 7-Zip on the menu. A few options will appear. Click Add to archive…. Select an archive format. The ZIP format is the easiest to open on other platforms, but if you choose the 7z format, you'll typically wind up with a smaller ZIP file. If you plan to send a 7z file to someone else, they'll be able to decompress it without installing additional software on a Mac.
If they are using Windows, they'll need to install 7-Zip, WinZip, or another 7z-compatible archive app.
Select Ultra from the "Compression level" menu. This will produce the smallest-possible file size. Select a dictionary size optional. If your file is very large, you can increase the dictionary size beyond the 64 MB default to reduce the size of the file, but it will take much longer to compress.
The maximum dictionary size is MB. Click OK to compress the file s. When 7-Zip finishes creating your compressed file, it will appear in the same folder as the original files—it's the file with a.
To see the file size of the compressed ZIP, right-click the. Method 2. Install Keka. Keka is a free, open source file compression tool for macOS that provides more compression options than the built-in zip archive utility. When you find it, click the GET button to install the app. Open Keka. Once Keka is installed, you'll find it in your Launchpad and the Applications folder.
Select a compression format. ZIP is the most common and can be opened on any platform without installing additional tools, but based on benchmark tests, 7Z will actually compress the ZIP to a smaller size than other formats, and at a faster speed.
Drag the slider all the way to the right. When the slider is at the "Slow" position, Keka will compress the file to the smallest size possible. Drag the file s you want to add to the compressed ZIP. If you want to compress multiple files into one ZIP, you can add them to a folder and drag the folder to the app.
Alternatively, you could hold down the Command key as you click each file, and then drag the highlighted files to Keka.
This will compress the files into a ZIP or 7z, whichever you selected. Include your email address to get a message when this question is answered. If you need to compress a ZIP file that contains an already-compressed format, begin by reducing the sizes of the files you're compressing. This could mean cutting off excess of an audio file, or reducing the resolution of a JPG.
Helpful 0 Not Helpful 0. Both 7-Zip and Keka allow you to split a ZIP or 7z file into smaller files as well as creating one larger file. Submit a Tip All tip submissions are carefully reviewed before being published. You Might Also Like How to. How to. About This Article.
Co-authored by:. Co-authors: 5. Updated: October 6, In this article, we'll answer your questions, including why to compress JPEG files and how to go about it. While other image formats feature lossless compression, meaning that the picture loses no quality with compression, JPG features lossy compression, which does.
Lossy compression reduces the image quality as the file size gets smaller. The most obvious thing to happen when a JPEG compresses severely is that finer details disappear.
On the other hand, a small amount of compression will have few artifacts, barely noticeable in busier images with many colors. JPG files can compress considerably to generate tiny file sizes. Because with image compression, you ultimately want as little perceptible image quality loss as possible. The best compression ratio to retain image quality is If you're looking to reduce the file size of your photographs while keeping image quality, this is the maximum compression ratio you want to shoot for.
Why compress JPEGs?
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