asc screenshot resize Use this skill to resize screenshots to the exact pixel dimensions required by App Store Connect and validate they pass upload requirements. Uses the built-in macOS sips tool — no third-party dependencies needed. Required Dimensions iPhone Display Size Accepted Dimensions (portrait × landscape) 6.9" 1260 × 2736, 2736 × 1260, 1320 × 2868, 2868 × 1320, 1290 × 2796, 2796 × 1290 6.5" 1242 × 2688, 2688 × 1242, 1284 × 2778, 2778 × 1284 6.3" 1206 × 2622, 2622 × 1206, 1179 × 2556, 2556 × 1179 6.1" 1125 × 2436, 2436 × 1125, 1080 × 2340, 2340 × 1080, 1170 × 2532, 2532 × 1170 5.5" 1242 × 2208, 2208 × 1242 4.7" 750 × 1334, 1334 × 750 4" 640 × 1096, 640 × 1136, 1136 × 600, 1136 × 640 3.5" 640 × 920, 640 × 960, 960 × 600, 960 × 640 Note: 6.9" accepts screenshots from 6.5", 6.7", and 6.9" devices. 6.3" accepts from 6.1" and 6.3". 6.1" accepts from 5.4", 5.8", and 6.1". iPad Display Size Accepted Dimensions 13" 2064 × 2752, 2752 × 2064, 2048 × 2732, 2732 × 2048 11" 1668 × 2420, 2420 × 1668, 1668 × 2388, 2388 × 1668, 1640 × 2360, 2360 × 1640, 1488 × 2266, 2266 × 1488 iPad Pro 2nd gen 12.9" 2048 × 2732, 2732 × 2048 10.5" 1668 × 2224, 2224 × 1668 9.7" 1536 × 2008, 1536 × 2048, 2048 × 1496, 2048 × 1536, 768 × 1004, 768 × 1024, 1024 × 748, 1024 × 768 Apple Watch Device Dimensions Ultra 3 (49mm) 422 × 514, 410 × 502 Series 11 (46mm) 416 × 496 Series 9 (45mm) 396 × 484 Series 6 (44mm) 368 × 448 Series 3 (42mm) 312 × 390 Mac Dimensions 1280 × 800 1440 × 900 2560 × 1600 2880 × 1800 Apple TV Dimensions 1920 × 1080 3840 × 2160 Workflow 1. Fix Unicode filenames macOS screenshots often contain hidden Unicode characters (e.g., U+202F narrow no-break space) that cause sips and other tools to fail with "not a valid file". Always sanitize first: python3 -c " import os for f in os.listdir('.'): clean = f.replace(' \u202f ', ' ') if f != clean: os.rename(f, clean) print(f'Renamed: {clean}') " 2. Check current dimensions sips -g pixelWidth -g pixelHeight screenshot.png 3. Validate App Store readiness Check for alpha channel and color space issues before uploading: sips -g hasAlpha -g space screenshot.png App Store Connect rejects screenshots with alpha transparency. Remove it by round-tripping through JPEG: sips -s format jpeg input.png --out /tmp/temp.jpg sips -s format png /tmp/temp.jpg --out output.png rm /tmp/temp.jpg Batch-strip alpha from all PNGs in a directory: for f in *.png ; do if sips -g hasAlpha " $f " | grep -q "yes" ; then sips -s format jpeg " $f " --out /tmp/temp.jpg sips -s format png /tmp/temp.jpg --out " $f " rm /tmp/temp.jpg echo "Stripped alpha: $f " fi done 4. Resize a single screenshot
Portrait iPhone 6.5" (1284 × 2778)
sips
-z
2778
1284
input.png
--out
output.png
Note:
sips -z
takes height first, then width:
sips -z
iPhone
sips -z 2868 1320 input.png --out appstore-screenshots/iphone-6.9.png sips -z 2778 1284 input.png --out appstore-screenshots/iphone-6.5.png sips -z 2622 1206 input.png --out appstore-screenshots/iphone-6.3.png sips -z 2532 1170 input.png --out appstore-screenshots/iphone-6.1.png sips -z 2208 1242 input.png --out appstore-screenshots/iphone-5.5.png 7. Verify output sips -g pixelWidth -g pixelHeight -g hasAlpha resized/*.png Confirm all files show the target dimensions and hasAlpha: no . Guardrails sips stretches images to fit exact dimensions. For best results, use source screenshots captured at or near the target aspect ratio. Always output to a separate file or directory ( --out ) to preserve originals. App Store Connect requires PNG or JPEG format. sips preserves the input format by default. Screenshots must not include alpha transparency. Always validate with sips -g hasAlpha before upload. Color space must be sRGB. If screenshots use Display P3, convert with: sips -m "/System/Library/ColorSync/Profiles/sRGB IEC61966-2.1.icc" input.png --out output.png .