1. Determine the target pixel dimensions
For print, calculate the required pixel width by multiplying the print width in inches by the target DPI. Use the same calculation for the height. To convert centimeters to inches, divide by 2.54. For example, a 20 × 15 cm print at 300 DPI requires approximately 2362 × 1772 pixels. This is a calculation example; your print provider may require a different resolution.
For screen use, target the pixel dimensions at which the image will be displayed. For example, output at the same dimensions can be a practical starting point for a slide displayed at 1920 × 1080 pixels. If you plan to zoom in or crop the image, you may need a larger one. An unnecessarily large output can increase file size, so consider where and at what size the image will be viewed when determining what the presentation needs to accomplish.
2. Distinguish export resolution from source-image quality
When you save a PowerPoint slide as a picture, its layout is converted into an image file. A higher export resolution can produce an output with more pixels, but it cannot create detail that is not present in a blurry or small photo used on the slide. If a photo is blurry, first check the source image added to the presentation and how much it has been enlarged on the slide.
For example, if a slide contains a photo that is 600 pixels wide and the photo will be printed at 20 cm wide, the source photo’s effective resolution will be about 76 DPI. Saving the entire slide as a larger PNG will not increase the photo’s actual detail. If possible, insert the photo from its original file at a sufficient size.
3. Check the slide aspect ratio
The output’s aspect ratio depends on the slide’s ratio. For example, 16:9 and 4:3 slides have different aspect ratios. If the target print’s ratio does not match the slide’s, stretching the content can distort the image, while cropping can cut off part of it. Before printing, decide which areas to preserve and keep important text and logos away from the edges.
Hypothetical example — 20 × 15 cm promotional image: If the target print has a 4:3 aspect ratio and is printed at 300 DPI, it will require approximately 2362 × 1772 pixels. If your slide is 16:9, decide in advance which content will fit in the print area. If necessary, adjust the slide layout to the target ratio; do not stretch the image out of proportion. The dimensions and DPI in this example are not required for every print job; check your provider’s technical requirements.
4. Save a slide as an image in Windows
Microsoft’s guide for Windows versions of PowerPoint explains how to save a slide as an image using File > Save As. You can choose PNG, JPEG, GIF, TIFF, BMP, WMF, or EMF as the file type. If the presentation has multiple slides, select Just This One when saving. Menu names may vary depending on your PowerPoint version and interface language.
According to Microsoft’s guide, the default export resolution for a slide saved as an image is 96 DPI. In the guide’s example, this corresponds to 1280 × 720 pixels for a widescreen slide. This does not guarantee the same pixel dimensions for every presentation size and export method, so check the file that is created.
The Windows guide also provides steps for editing the ExportBitmapResolution value in the registry to change the export resolution. This requires making a registry change. Because an incorrect change can cause problems, back up the registry before proceeding, and follow the path that corresponds to your PowerPoint version in the guide. The guide explains that you should select decimal when entering the value, then save the slide as an image. Since there are limits depending on the version and slide size, check the limitations in Microsoft’s guide to confirm whether the target value is valid.
5. Export as an image on Mac
The steps in Microsoft’s PowerPoint for Mac guide are File > Export. Choose an image format such as JPEG or PNG, then select Save All Slides or Save Current Slide Only. According to the guide, you can also enter the size of the slide images in the width and height boxes. If you do not see this option, check your PowerPoint version’s export screen and help information. The Windows registry steps do not apply to Mac.
6. Verify the output
Check the exported file’s pixel width and height; do not rely on the DPI label alone. The Windows guide notes that you can verify the resolution in the saved image’s properties. For print, you can calculate the effective DPI by dividing the image’s pixel dimensions by the number of inches in its print size.
For example, if an image that is 2362 pixels wide is printed at 20 cm, or approximately 7.87 inches, wide, its effective resolution will be about 300 DPI. If the same file is printed at 40 cm wide, its effective resolution will be approximately half that. Finally, inspect the image at its intended size; if print quality is important, make a test print whenever possible.
7. Frequently asked questions
What resolution should I choose for print?
Calculate the required pixel dimensions using the print size and the resolution required by your print provider. 300 DPI is the target used in this article’s example; it should not be treated as a universal requirement for every print job.
Will increasing DPI fix a blurry photo?
No. A higher export resolution can convert the slide into more pixels, but it cannot restore detail that is not in the source photo. Check the source image and the exported file’s pixel dimensions separately.
What should I do if the file is smaller than I expected?
First, check the resulting file’s pixel dimensions and the export steps you used. If you are using Windows, review the registry steps and limitations in Microsoft’s resolution guide for your version. If you are using Mac, check the width and height options on the export screen.
Final checklist
- I determined the target print or screen dimensions and the required pixel dimensions.
- I compared the slide ratio with the target ratio and avoided stretching or unwanted cropping.
- I checked the source photo’s size and sharpness.
- I used the PowerPoint export path appropriate for my platform.
- I verified the resulting file’s pixel dimensions and calculated the effective DPI at the target print size.
Sources
- Microsoft, Change the export resolution of a PowerPoint slide
- Microsoft, Export your PowerPoint for Mac presentation as a different file format
For PNG-specific steps, see the guide to exporting a PowerPoint slide as a PNG; for Google Slides, see the guide to getting a high-resolution image from Google Slides.
← Back to blog
