Asc Screenshot Resize

If you've ever had App Store Connect reject your screenshots for being the wrong size or having alpha channels, this is the workflow you wish you'd known earlier. It wraps the asc CLI and macOS sips to resize, validate, and strip transparency from screenshots before upload. The smart part is it queries asc for current accepted dimensions instead of relying on a hardcoded table, since Apple changes requirements. Includes a Python snippet to fix those invisible Unicode spaces in filenames that make batch commands fail silently. The validation step catches issues locally before you waste time uploading, and the guardrails around aspect ratio and color space are honest about the tradeoffs.

skills.sh installs: 853
GitHub stars: 905
last updated: Jul 14, 2026

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Install

$ npx -y skills add rudrankriyam/asc-skills --skill asc-screenshot-resize --agent claude-code

Installs into .claude/skills of the current project.

Files

asc screenshot resize

Use this skill to prepare screenshots for App Store Connect. Do not rely on a hard-coded dimension table in this skill; the CLI owns the current size matrix.

Source of truth

Always discover current accepted sizes from asc first:

asc screenshots sizes --output table
asc screenshots sizes --all --output table

For local validation before upload:

asc screenshots validate --path "./screenshots/iphone" --device-type "IPHONE_65" --output table
asc screenshots validate --path "./screenshots/ipad" --device-type "IPAD_PRO_3GEN_129" --output table

Common current device-type anchors: