Short answer: yes, the 2x2 inch photo Americans know from the US passport office works for the Cambodia eVisa, because the online application reads pixels and file size, not a printed inch or millimeter measurement. Here is why the 35x45 mm number keeps coming up, and what actually matters when you upload.

A 2x2 inch photo is fine for the Cambodia eVisa. The online application is a digital upload that reads your photo by its pixels and file size, not by a printed inch or millimeter measurement, so the US 2x2 inch (51x51 mm) format Americans already know works without modification. The 35x45 mm figure you may have seen is the older printed passport-style dimension that describes the framing — head and shoulders, face filling most of the frame — rather than a rule the uploader checks. What the system actually requires is a JPEG under 2 MB, ideally 600x600 pixels or larger and roughly square, on a plain white background, with a neutral expression and no glasses. Crop a standard US passport photo to a square and it uploads cleanly.
If you have a US passport photo on hand — the square 2x2 inch shot the State Department asks for — you can use it for the Cambodia eVisa without re-shooting. That trips people up because half the guides online quote a 35x45 mm size and the other half say 2x2 inches, and the two numbers do not match. The reason both can be true is simple: the Cambodia eVisa is an online upload, and an online upload does not care about inches or millimeters at all. It reads your photo as a digital file, by its pixel dimensions and its file size.
So the inch-versus-millimeter debate is mostly a leftover from the era of printed passport photos pasted onto paper applications. When you submit a Cambodia eVisa, no one measures a physical card. The system checks that your image is a JPEG, under 2 MB, sharp enough to read your face, and framed like a passport photo. A US 2x2 inch photo satisfies every one of those once you crop it square, which it usually already is.
This guide explains exactly where the 35x45 mm number comes from, why your 2x2 inch photo still works, and the handful of things the upload validator genuinely does enforce so your file clears on the first try. When your photo is ready, you can apply in a few minutes. For the wider picture — cost, processing, documents — start at our Cambodia visa for United States citizens hub and work down from there.
The two figures come from two different passport-photo traditions. The United States standardized on a 2x2 inch (51x51 mm) square photo — that is the size you get at the drugstore counter or the post office, and it is what the US passport office requires. Most of the rest of the world, including the printed-photo convention many visa guides were originally written against, uses a 35x45 mm portrait rectangle. Cambodia sits in a region where the 35x45 mm number circulated for years, so older guides repeat it.
Here is the key point Americans miss: 35x45 mm is a printed-card dimension, not a digital rule. It describes a physical photo you would have glued to a paper form. The Cambodia eVisa replaced that paper workflow with an online upload, and the upload does not measure your photo in millimeters. It measures it in pixels and megabytes. So the 35x45 mm figure is really just telling you how to frame the shot — head and shoulders, face filling most of the frame, a little space above the hair — not what file to produce.
And the framing on a US 2x2 and a 35x45 portrait is nearly identical in practice. Both want your head and the top of your shoulders filling the frame, centered, looking at the lens. The 2x2 is square and the 35x45 is slightly taller, but once your face dominates the frame the difference is trivial and the uploader is happy with a square crop. If you want the precise pixel math and the megabyte limit spelled out, our deep dive on Cambodia eVisa photo size and file format covers the exact numbers the validator reads.
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Forget inches and millimeters for a moment. Here is what the Cambodia eVisa upload genuinely verifies, in plain terms. First, the file format: it wants a standard JPEG, not the HEIC that modern iPhones save by default and not a PNG. Second, the file size: under 2 MB, which a cropped phone photo comes in well below. Third, the resolution: at least 600x600 pixels, roughly square, so your face is sharp enough to read. Get those three right and the dimensional question answers itself.
Then it checks the content of the photo, which is where most Americans actually lose a day — not on size, but on a smile, a pair of glasses, or an off-white wall. The validator wants a plain white or off-white background with no patterns or furniture behind you, your full face centered and looking at the lens, a neutral expression with no smile and no teeth, no glasses of any kind, and no hats except daily religious head coverings. That is the same content rule as a US passport photo, which is exactly why your 2x2 shot transfers over so cleanly.
So a US passport photo is doubly convenient: it already matches the framing, and it already matches the content rules. The only step is making sure the digital file is a JPEG under 2 MB at 600 pixels or more per side. If your photo has already been bounced and you are not sure which rule caught it, our guide to fixing a rejected Cambodia eVisa photo maps each flag to the exact correction so you can re-upload the same day.
If you already have a US passport photo — whether a print from the drugstore or the digital copy many services email you — you are most of the way there. The fastest path is the digital file. Many US photo services send you a 2x2 inch image at 600x600 pixels or higher, which is already in range for the Cambodia eVisa. Confirm it is a JPEG, confirm it is under 2 MB, and upload it. If it is a HEIC or a huge camera original, open it in your phone or computer Photos app, crop it square around your head and shoulders, and export a JPEG copy.
If all you have is a printed 2x2 card, you can photograph or scan it, but a fresh shot is usually cleaner. A photo of a print under room lighting often picks up glare, a slight color cast, or a soft edge that the validator reads as a problem. If you go the scan route, lay the print flat, use daylight rather than flash, and crop tightly to the photo edge so none of the surrounding card or background sneaks into the frame. Then check the result is sharp, square, and at least 600 pixels on each side.
Honestly, for most Americans the path of least resistance is to take a fresh shot at home rather than wrestle with an old print. A phone camera against a white wall in daylight produces a compliant photo in two minutes, and it is born digital so there is no scanning or glare to fight. Our step-by-step Cambodia eVisa iPhone photo guide for Americans shows each tap from camera setting to upload, and the take-it-with-your-phone walkthrough covers the same routine on any device.
In practice, almost nobody gets flagged for "wrong size in inches." The size-related rejections my desk sees trace back to a short list of digital-file mistakes, and once you know them they are easy to sidestep before you upload.
Notice that none of those are about whether your photo is 2x2 inches or 35x45 mm — they are about the digital file behind the dimension. Get the JPEG, the 2 MB ceiling, and the 600-pixel floor right, and the inch-versus-millimeter question never matters. For the complete content checklist alongside the file specs — background, expression, glasses, and the rest — our full Cambodia eVisa photo requirements guide for US citizens lays out every rule in one place.
Most American applicants can reuse or shoot a 2x2-style photo without a second thought. A few situations come up often enough on my desk to be worth flagging before you upload.
Children and babies each need their own Cambodia eVisa with their own photo, on the same neutral-expression, plain-white-background rule as adults — and the same digital file standard. If your local drugstore took a 2x2 of your toddler for a US passport, that same digital file works here once it is a JPEG under 2 MB. The hardest part is the no-smile, eyes-open shot of a young child, not the dimension; lay an infant on a plain white sheet and shoot straight down with no hand, toy, or second person in the frame.
Drugstore and pharmacy photos taken for a US passport are dimensionally fine, but ask for the digital copy rather than only the printed strip. Many chains email you the file or store it to an app, and that digital version uploads far more reliably than a phone snapshot of the print. If a service only hands you paper, it is usually faster to take a fresh phone photo at home than to scan and clean up the print.
Old prints are the one to be careful with. A 2x2 photo from a passport you renewed three years ago may be dimensionally correct but fail the recency rule — the photo must be from the last 6 months and still look like you. If yours is older than that, shoot a fresh one rather than reuse it. Before you submit, it is worth running the full Cambodia eVisa photo checklist so size, recency, format, and content all clear together, and if you would rather not shoot at home, our where to get a Cambodia visa photo guide covers the US drugstore and pharmacy options.
So: is 2x2 inches OK for a Cambodia visa photo? Yes. The eVisa is a digital upload, your US 2x2 inch photo crops square and uploads cleanly, and the 35x45 mm figure is a framing reference from the printed-photo era rather than a rule the system checks. What the validator genuinely cares about is a JPEG under 2 MB, at least 600 pixels per side, on a plain white background, with a neutral face and no glasses. Hit those and the dimension never comes up.
And if the photo is flagged after you submit, it is a same-day fix, not a fresh application. You get an email listing exactly what to re-upload — usually a JPEG instead of a HEIC, or a fresh shot against a white wall. There is no extra charge: free resubmission is part of the all-in price, and the moment you reply with a corrected photo the 3-business-day clock keeps running. The Tourist eVisa is $80 USD all-in and the Business eVisa is $90 USD all-in, both delivered as a printable PDF by email, both with US-timezone support if anything snags. When your photo is ready, our step-by-step Cambodia eVisa application guide for Americans walks through every field.
Next steps and related reading for US citizens: apply for your Cambodia eVisa when your photo is ready, bookmark the Cambodia visa hub for United States citizens as your single reference, get the exact photo size and file format if you are unsure about pixels and megabytes, and check the full photo requirements before you upload.