Why Print Shops Don't Accept HEIC
Photos that won't open at the shop are a daily scene at print counters: commercial print equipment updates slowly and most of it only speaks JPG. Spend one minute on your phone converting beforehand and skip the awkwardness.
Why print equipment lags behind
Professional printing hardware and self-service kiosks measure firmware cycles in years, and the accepted list is still essentially 'JPG + TIFF'. HEIC is everywhere on phones, but equipment vendors have little incentive to move — receiver inertia is what defines compatibility.
The errors you'll see
Most often an outright rejection: 'unsupported file format' or 'cannot read'. Sneakier are the kiosks that accept HEIC but internally transcode at minimal quality — the prints come out soft. Both point to the same fix: convert it yourself first.
Conversion settings before printing
Quality at 90–95%, original dimensions untouched: printing is resolution-sensitive, so never enable any 'shrink to fit' option. Batch-convert a few dozen photos in one go and bring them by cable or cloud.
Print size reference
For 6-inch prints, aim for a long edge of at least 1800 pixels. iPhone default output is 4032×3024 — converted to JPG, that comfortably covers up to 12-inch prints. Don't upscale for 'extra sharpness': interpolation adds no detail, only bytes.