Asc Screenshot Resize
If you've ever had App Store Connect reject your screenshots because they're 2 pixels off or have alpha transparency, this skill is the workflow you need. It wraps the `asc` CLI and macOS `sips` to validate, resize, and strip alpha from screenshots before upload. The key insight is treating `asc screenshots sizes` as the source of truth instead of hardcoding dimensions that go stale when Apple changes requirements. It also handles the annoying Unicode space bug in macOS screenshot filenames and includes a clever JPEG round-trip trick to remove alpha channels. The guardrails are smart: always validate before upload, never overwrite originals, and don't stretch images across incompatible aspect ratios unless you're okay with the distortion.
- skills.sh installs
- 5.3K
- GitHub stars
- 1.1K
- last updated
- Aug 21, 2026
Install
$ npx -y skills add rorkai/app-store-connect-cli-skills --skill asc-screenshot-resize --agent claude-codeInstalls 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:
IPHONE_65for the common 6.5-inch iPhone screenshot set.IPAD_PRO_3GEN_129for the common 12.9/13-inch iPad screenshot set.
Run asc screenshots sizes --all when targeting other display types such as 6.9-inch iPhone, Apple TV, Mac, Vision Pro, iMessage, or Watch.
Workflow
1. Sanitize filenames
macOS screenshots can contain hidden Unicode spaces that make tools fail with "not a valid file". Sanitize before batch work:
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- Repository
- github.com/rorkai/app-store-connect-cli-skills
- Categories
- Mobile Development, CLI & Terminal
- First seen
- Jun 3, 2026
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