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An iPad mockup is a tablet frame around your app screen, not a scaled-up iPhone image. If the app runs on iPad, App Store Connect requires a 13-inch screenshot set. This tool exports 2064×2752, which is one of the two portrait sizes Apple accepts for that display. It is free, in the browser, with no watermark.
iPhone screenshots do not satisfy the iPad requirement. Apple’s 13" class accepts 2064×2752 or 2048×2732 in portrait, and the same pairs reversed for landscape. This generator exports 2064×2752. It does not export 2048×2732.
Smaller iPad classes can be scaled by App Store Connect from the 13" set when you do not upload them separately. Check Apple’s screenshot specifications before you submit, because accepted sizes can change.
Use an iPad frame or go frameless, keep the headline short, and export up to 10 screenshots. The first one or two are what most people see on the listing.
Processing stays on your device. Nothing is uploaded to make the mockup.