Mac screenshots need a Mac source
Apple lists several 16:10 Mac screenshot sizes, including 2560 × 1600. The preset creates that exact canvas and uses fit with padding so a smaller source is not silently stretched into a desktop interface.
Image requirement guide
Resize Mac App Store screenshots
Mac screenshots require a desktop source that represents the Mac interface. Aftermath can create the canvas, but it will warn when the source is not a genuine match.
Apple screenshot specifications ↗ Source verified 2026-08-14
Treat the output as a file check
A correctly sized PNG is not proof that the screenshot represents the Mac version of an app. Use the warning messages to catch softness and aspect-ratio tradeoffs, then verify the destination’s accepted size and source authenticity before submission.
Questions people ask
What Mac sizes does Apple accept?
Apple’s current reference lists multiple 16:10 choices. This tool starts with 2560 × 1600 and links to the official list.
Why does the tool warn about a mobile source?
Padding or scaling a mobile capture does not make it a genuine Mac screenshot. The warning protects against a misleading submission.
How to use this tool
Use this route for a genuine Mac interface capture that needs the bundled 16:10 desktop starter size. It creates a separate 2560 × 1600 JPEG and uses fit handling to avoid silent stretching. A mobile screenshot can match those pixels after resizing but still is not an authentic Mac source and may be rejected.
What to choose and what you get
What to choose
- an authentic local JPG, PNG, or WebP Mac interface capture
Result
- a separate 2560 × 1600, 16:10 JPEG starter output
Supported use
- prepare the bundled 16:10 Mac desktop canvas
- fit with visible padding rather than stretch a mismatched source
Before you start
- Does not convert a mobile or tablet capture into an authentic Mac interface screenshot.
- Does not certify App Store acceptance or editorial suitability.
Supported formats
- Accepted formats: JPG, PNG, WebP, HEIC, AVIF, GIF, BMP.
- Output formats: JPG, PNG, WebP.
Browser support and permissions
- Modern browser with JavaScript, a supported image decoder, and enough memory for the selected image.
- No camera, microphone, or screen permission is needed.
Choose the right settings
- Use this route only for an authentic Mac source capture.
- Use the broader App Store route when the destination device family is undecided.
- Review padding, composition, dimensions, and source authenticity before submission.
Worked example
An authentic Mac interface capture needs a 2560 × 1600, 16:10 starter canvas without stretching the UI.
Starting facts
- The source is a genuine Mac app capture.
- The selected fit method controls any padding or crop.
Observed operation: Place the capture on the 2560 × 1600 starter using an explicit fit choice and create a separate JPEG.
Review the result: Review interface authenticity, edge content, text clarity, exact pixels and current Apple requirements.
Boundary: The starter cannot guarantee store review, rights, device representation, content policy or specification stability.
What you can do
Prepare an authentic Mac interface capture on the bundled 2560 × 1600, 16:10 desktop starter canvas.
Next step: Choose a related route when the input, output, or required workflow is different.
If it does not work
- A non-16:10 source can require padding or cropping that changes composition.
- A resized mobile source can pass dimensions while remaining unsuitable as a Mac capture.
- Apple may change the accepted Mac size list after the source review date.
Things to know
- The preset uses one Apple-listed 16:10 starter size; it is not the only possible Mac screenshot size.
- The tool cannot verify the source platform or App Store editorial requirements.
Privacy boundary
The selected image stays in the current browser session and is not sent to an Aftermath processing service. How local processing is verified.
What this tool verifies
Checks the displayed limits and reports or creates a separate 2560 × 1600, 16:10 JPEG starter output from an authentic local JPG, PNG, or WebP Mac interface capture.
Check before sharing
Does not convert a mobile or tablet capture into an authentic Mac interface screenshot.