Your iPhone already shoots at a higher resolution than the Cambodia eVisa form needs. The only real trap is the file format — iPhones save HEIC, the form wants JPEG. Here is the full 5-minute routine, from white wall to converted JPEG under 2 MB.

Stand about a foot and a half from a plain white wall, face a window so daylight hits you from the side, and have someone shoot you with the rear camera (not the selfie camera) held in portrait at eye level. Keep a neutral expression — eyes open, no smile, no glasses, no hat. Then crop the photo to a square of at least 600×600 pixels and make sure it is a JPEG under 2 MB. The one iPhone-specific step Americans miss: iPhones save photos as HEIC by default, and the form needs a JPEG, so either switch your Camera setting to "Most Compatible" before shooting or convert the photo to JPEG before you upload.
The phone in your pocket is a better passport-photo camera than the booth at the post office. Every iPhone made in the last decade shoots at a far higher resolution than the Cambodia eVisa form requires, the color is accurate, and the front-facing daylight you get at a window beats the harsh ring light a booth uses. There is genuinely no reason for an American applicant to pay for a photo when the iPhone already does the job.
The catch is not the camera. It is one setting buried in iOS that quietly trips up more American applicants than anything else: by default, recent iPhones save photos in HEIC, a compact Apple format the eVisa upload form does not accept. You can shoot a flawless headshot and still get bounced purely because the file ends in .heic instead of .jpg. Fix that one thing and the rest is a five-minute routine.
This guide walks you through the whole thing on an iPhone specifically — the Camera setting to change first, where to stand, how to frame the shot, and exactly how to convert HEIC to JPEG when you forget. If you want the underlying numbers — dimensions, pixels, megabytes — our photo size and file format breakdown lays out every spec, and the full photo requirements guide for US citizens frames it as a complete checklist. When you are ready, you can apply in a few minutes.
Do this before you take a single frame and you save yourself the most common iPhone headache entirely. HEIC (High Efficiency Image Container) is the format recent iPhones use to keep photos small, and it is fine for everyday life — but the Cambodia eVisa form expects a standard JPEG, and an .heic file will not upload cleanly.
There are two ways to handle it, and the easier one is to never create the HEIC in the first place. Open Settings, tap Camera, then tap Formats, and choose "Most Compatible." From that point on, your iPhone shoots JPEG instead of HEIC, and you can leave the setting that way or switch it back to "High Efficiency" once your application is in. Most Americans set it, shoot the photo, and forget about it.
If you already shot the photo in HEIC and do not want to reshoot, you convert it instead — that is covered in Step 4 below. Either path works. The point is simply that a JPEG has to be what lands in the upload box, because a rejected file format is one of the few snags that gets flagged before a human even looks at your application.
Turn Live Photos off for this — tap the concentric-circles icon at the top of the Camera screen so it shows a slash. A Live Photo bundles a short video with the still, which complicates the file when you export it. And do not use Portrait mode: the artificial background blur it adds is exactly the kind of processing the validator reads as a manipulated image. You want a plain, flat, ordinary photo in the standard Photo mode.

The setup is the part that decides whether the photo passes, and it takes about a minute. You need three things: a plain white wall, even daylight, and the right distance from the wall so you do not throw a shadow.
Find a plain white wall — interior paint is ideal, but a closed white door or a white sheet pinned flat works just as well. Stand about a foot and a half in front of it, not pressed against it. That gap matters: stand too close and the wall behind your head picks up a shadow that the validator reads as a non-uniform background, which is one of the most common flags on American photos.
For light, face a window where daylight comes in from the side, not directly behind you. Side daylight lights your face evenly and keeps the wall reading as true white. Mid-morning or mid-afternoon is the sweet spot. Avoid evenings, when warm indoor bulbs turn a white wall a faint yellow or cream — and a cream wall reads as off-white to the upload check. Never use the iPhone flash; it blows out your face and bounces a hard shadow onto the wall.
Last, get yourself camera-ready. Glasses off, even if you wear them every waking hour — any frames at all get rejected. No hat, no headphones, no AirPods. Tuck your hair behind your ears so your full face is visible from the top of your forehead to your chin. Keep your expression relaxed and neutral: eyes open, mouth closed, no smile. Americans are wired to smile for a camera, and a smile is the single most-flagged issue, so consciously let your face go flat.

Use the rear camera, not the selfie camera. The front camera is lower resolution and subtly distorts your features when held at arm's length, and the validator can catch that distortion. Hand the iPhone to someone else, or prop it on a shelf and use the timer or volume-button shutter. Hold or place it in portrait orientation, level with your eyes — not angled up from your chest or down from above.
Stand a few feet back so your head and the top of your shoulders fill the frame with a little headroom above. Look straight into the lens. Take five or six frames rather than one — small differences in expression and head angle add up, and you want options when you pick the keeper. Between frames, glance at the wall behind you on the screen: if you can see a shadow creeping in on one side, step forward or turn slightly toward the window.
Once you have your frames, open Photos and pick the one where your face is square to the camera, eyes open, expression neutral, and the wall behind is clean and even. That is your file. Do not run it through a filter, do not use the editing tools to brighten or smooth your skin, and do not crank the warmth — the validator looks for natural skin texture and true color, and heavily edited photos get bounced.

Now you turn the keeper into an upload-ready file. Three quick moves: crop it square, make sure it is a JPEG, and confirm it is under 2 MB.
Open the photo in Photos, tap Edit, then the crop tool, and choose the square aspect ratio. Position your head centered with a little headroom above and your shoulders at the bottom edge. A square of at least 600×600 pixels is the safe target — an iPhone photo cropped this way clears that comfortably. Tap Done to save.
If you forgot to switch the Camera format and your photo is a HEIC, the simplest fix on the iPhone itself is to save it through the Files app: in Photos, tap Share, choose "Save to Files," and many iOS versions will offer a JPEG copy on save. The most reliable route is to open the photo, tap Share, and use "Copy Photo," then paste it into the Files app, which stores it as a JPEG. If that feels fiddly, emailing the photo to yourself often converts it to JPEG on the way, or you can use any free HEIC-to-JPEG converter. Whichever you use, confirm the saved file ends in .jpg before you upload.
A square iPhone JPEG is almost always well under the 2 MB ceiling, but it is worth a glance. If the file is somehow oversized, a light re-crop or saving a slightly smaller copy brings it down without visibly hurting quality. You do not need to chase a specific kilobyte count — anything under 2 MB is fine, and a clean square JPEG around a few hundred kilobytes is perfect.

That is the whole iPhone routine: change one setting, shoot against a white wall in daylight, crop square, make sure it is a JPEG under 2 MB. If your photo somehow still gets flagged, it is no drama — you re-upload a corrected version with free resubmission, and the clock keeps running. Our guide to fixing a rejected Cambodia eVisa photo walks through each flag, and if your file refuses to come down under the limit, the how-to-compress-an-oversized-photo guide covers that one cleanly.
With the photo sorted, the rest of the eVisa is light. Tourist eVisa is $80 USD all-in, Business eVisa is $90 USD all-in, both approved in 3 business days and delivered as a printable PDF by email, both with free resubmission if Immigration flags a correction, and both backed by US-timezone support. The photo and a scan of your passport bio page do most of the work — there is no return flight, hotel booking, or bank statement to upload.
Next steps and related reading for Americans: apply for your Cambodia eVisa once your iPhone photo is a clean JPEG, check the background rules for US applicants if you are unsure whether your wall reads as white, follow the full US step-by-step application guide to see every other field, and bookmark our Cambodia visa hub for US citizens as the single reference for cost, documents, and timing.
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