asc-screenshot-resize

Original：🇺🇸 English

Translated

Resize and validate App Store screenshots for all device classes using macOS sips. Use when preparing or fixing screenshots for App Store Connect submission.

3installs

Sourcerudrankriyam/app-store-connect-cli-skills

Added on2026-03-28

NPX Install

npx skill4agent add rudrankriyam/app-store-connect-cli-skills asc-screenshot-resize

SKILL.md Content

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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:

bash

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

bash

sips -g pixelWidth -g pixelHeight screenshot.png

3. Validate App Store readiness

Check for alpha channel and color space issues before uploading:

bash

sips -g hasAlpha -g space screenshot.png

App Store Connect rejects screenshots with alpha transparency. Remove it by round-tripping through JPEG:

bash

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:

bash

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

bash

# 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 <height> <width>

.

5. Batch resize all screenshots in a directory

bash

mkdir -p resized
for f in *.png; do
  sips -z 2778 1284 "$f" --out "resized/$f"
done

6. Generate multiple device sizes from one source

bash

mkdir -p appstore-screenshots
# 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

bash

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

.

asc-screenshot-resize

NPX Install

Tags

SKILL.md Content

asc screenshot resize

Required Dimensions

iPhone

iPad

Apple Watch

Mac

Apple TV

Workflow

1. Fix Unicode filenames

2. Check current dimensions

3. Validate App Store readiness

4. Resize a single screenshot

5. Batch resize all screenshots in a directory

6. Generate multiple device sizes from one source

7. Verify output

Guardrails