A square JPEG, at least 600×600 pixels, under 2 MB. That is the entire Cambodia eVisa photo size and file spec for Americans in 2026 — and the iPhone HEIC default is the one thing that quietly bounces the most US files at upload.

A square image at least 600×600 pixels, saved as a JPEG (.jpg), with the file size under 2 MB. The printed passport equivalent is 4×6 cm (about 1.6×2.4 inches), but you never print it — the Cambodia eVisa is fully digital, so the pixels and the file size are what the upload form checks. The single most common format problem for Americans is the iPhone HEIC default: recent iPhones save photos as HEIC, not JPEG, and the form rejects HEIC. Switch the camera to "Most Compatible" before you shoot or convert the finished photo to JPEG, crop it to a square, and confirm the file is under 2 MB.



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