Keynote Standard Background Resizer
Keynote can use a 4:3 custom slide size for older screens and projector setups. Use this classic slide shape for a legacy deck or venue that presents in 4:3. This preset creates a 1024×768 JPG while preserving the 4:3 slide shape; review the crop before adding it to your deck.
Sizes, to scale
Keynote Standard Background size
Keynote Standard Background size: 1024×768 pixels (4:3)
1024×768 is a practical 4:3 working canvas; Apple does not require this pixel count, so confirm the slide dimensions in the Document sidebar.
1024
width (px)
768
height (px)
4:3
aspect ratio
Need other dimensions? Browse all Keynote sizes or use the free image resizer for any platform.
Sources
We check platform-specific dimensions against source documentation when available.
- Apple Support — Change the slide size in Keynote - Documents preset and custom slide dimensions for different screen ratios.
- Apple Support — Change a Keynote slide background - Documents image fill, Scale to Fill, and Scale to Fit behavior.
How to resize an image for a Keynote standard background?
- 1
Step 1: Upload the source image
Choose a clear JPG, PNG, WebP, or HEIC image. Start with a source at least as large as the target canvas when possible.
- 2
Step 2: Apply the 4:3 preset
Select 1024×768, then use the crop preview to keep text, faces, and logos away from the edges.
- 3
Step 3: Add it to Keynote
Open the Document sidebar, choose Custom Slide Size, and set a 4:3 canvas. Use Image Fill and compare Scale to Fit with Scale to Fill before presenting.
What size should a Keynote standard background image be?
Keynote can use a 4:3 custom slide size for older screens and projector setups. The 1024×768 preset is a practical working canvas with a 4:3 aspect ratio. 1024×768 is a practical 4:3 working canvas; Apple does not require this pixel count, so confirm the slide dimensions in the Document sidebar.
Will a 1024×768 image fill the slide without stretching?
It matches the 4:3 slide shape. The image can still crop if the deck uses another ratio or a fill mode, so confirm the slide setup first and review the edges after placement.
Should presentation images be JPG or PNG?
JPG is usually smaller for photographs. PNG is better for diagrams, screenshots, and graphics that need crisp edges or transparency. This resizer downloads JPG files.
All Keynote Image Sizes
Choose another available Keynote canvas and review its source notes
Presentation image sizes
Match a full-slide image to the deck's aspect ratio before adding it as a background. Compare the documented and working canvases for other presentation apps.
File tools
Convert the resized image
Need a different file format or transparent background? Choose a focused converter, then check the preview and encoded size before downloading.
Put Your Keynote Standard Background Image Into a PDF
Put one image on each page, arrange the order, and create the PDF in your browser.
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