Here, click the Compress Pictures button in the Adjust group.

In the Compression Options group, you can choose if the compression applies only to the selected picture.

If you uncheck this option, PowerPoint will compress all of the images in the presentation, which overrides any changes you may have made to those images.

Once selected, click Compress Pictures in the Picture Format tab.

Select the picture quality youd like to use, then select if youd like to apply the compression to all images in the presentation or only the selected image.

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Choose File Reduce File Size (from the File menu at the top of the screen).

Select the adjustments you want to make: Scale down large images: Images are scaled to the resolution used in the presentation while preserving visual quality.

For example, if you added a photo to your presentation and resized it to be smaller, selecting this option removes the unused image data.

Note: Whether or not you select this checkbox, if an image is in a format that cant be viewed on iPhone or iPad, its automatically converted to a format that can.

Remove trimmed parts of movies and audio: If you trimmed the start or end of movies or audio clips (using the controls in the Format sidebar), the trimmed portions are deleted.

Most compatible (H.264): Movies in your presentation are converted to H.264 format, which plays on most iOS devices, iPadOS devices, and Mac computers.

High efficiency (HEVC): This format option appears only if youre using macOS 10.13 or later and your Mac supports hardware HEVC encoding.

If youre using macOS 10.13 or later and Keynote 8.0 or later and you select this format, you can later add HEVC files to the reduced-size presentation or copy.

For more information about HEVC, see this Apple Support article.

Note: H.264 and HEVC dont support alpha channels, so transparency is converted to a black background.

Preserve original format: This option retains the current movie formats.

In this case, any movies in formats incompatible with iOS or iPadOS arent optimized and therefore dont play on iOS or iPadOS devices.

Movies with a resolution smaller than the maximum arent scaled up.

Click one of the following buttons to apply the adjustments: Reduce This File: Applies the settings to the original presentation.

Reduce a Copy: Applies the settings to a copy of the presentation and preserves the original presentation.

Enter a name for the copy of the presentation and choose where to save the copy, then click Save.

Note: Its possible to choose a combination of options that makes the file size larger.

See also Add video and audio in Keynote on Mac Record audio Set movie and image formats for Keynote presentations on Mac.

Image Compression In Powerpoint For Mac