Resize and validate App Store screenshots with current asc screenshot-size data and macOS sips. Use when preparing or fixing screenshots for App Store Connect submission.

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: For local validation before upload: Common current device type anchors: IPHONE 65 for the common 6.5 inch iPhone screenshot set. IPAD PRO 3GEN 129 for 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: 2. Inspect dimensions and metadata App Store Connect rejects screenshots with alpha transparency. Strip alpha by round tripping through JPEG: Batch strip alpha from PNGs: 3. Resize only after choosing a target from asc Pick a width and height from asc screenshots sizes all . sips z takes height first, then width: Batch resize to a chosen target: 4. Validate outputs with asc 5. Upload only after validation Guardrails Treat asc screenshots sizes all as authoritative; Apple size requirements change. Do not stretch screenshots across incompatible aspect ratios unless the user accepts the visual tradeoff. Always output to a separate file or directory to preserve originals. Screenshots must be PNG or JPEG and must not include alpha transparency. Convert Display P3 or other color spaces to sRGB when needed: Prefer asc screenshots validate over visual inspection before upload.

asc-screenshot-resize