StyleSeat's documented limit is generous: JPEG, PNG and HEIC photos up to 14MB are supported, and that cap applies to the photos clients share with a pro before an appointment as well as gallery uploads. Fourteen megabytes is not much of a wall for a phone photo, which means the real problem is not rejection, it is speed. StyleSeat's own profile guidance is that you should have a profile photo and at least five gallery photos, and tag at least two photos to each service, because a service needs a tagged photo before its bookable page can be shared at all. That is a lot of images rendered in one grid, and a gallery of full-weight 8MB files makes a mobile visitor wait. The useful move is to keep composition intact — StyleSeat's photo editor handles crop and rotate, and pulling in an Instagram feed resyncs the last fifty posts, so you do not need to re-frame anything by hand — while cutting the megapixels a phone screen cannot show. HEIC is accepted on upload, but converting to JPG makes the same file usable everywhere else you post it, including platforms that reject HEIC outright. Skwish handles HEIC-adjacent conversion paths through JPG and WebP output, resizes to a sane long edge, and batches the set with a ZIP download. Everything runs in the browser.