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.
The Cambodia eVisa photo has a tiny technical spec, and almost every American gets the composition right — true white wall, neutral face, glasses off — only to get tripped at the last step by a number or a file type. A square JPEG, at least 600×600 pixels, under 2 MB. That is the whole specification. The trouble is that the phone in your pocket does not save files that way by default, and the gap between what your camera produces and what the form wants is where US applications quietly lose a day.
Two things cause nearly all of it. First, recent iPhones save photos as HEIC rather than JPEG, and the upload form does not accept HEIC. Second, a full-resolution phone photo is often three to eight megabytes — well over the 2 MB ceiling — so a perfectly compliant headshot gets bounced for size alone. Neither is hard to fix once you know it is coming, and this guide walks through every number so the upload clears on the first pass.
Below: the exact pixel and size targets, the millimeter-to-inch conversions Americans keep searching for, the JPEG-versus-HEIC question in plain terms, and how to compress an oversized file without wrecking it. If you want the composition rules first — background, expression, the no-glasses rule — start with our full photo requirements guide for US citizens, then come back here for the file mechanics. When everything is squared away, you can apply in a few minutes.
Start with the dimensions, because they are the easy half once you ignore the noise. The form accepts a square image, so a 600×600-pixel JPEG is the safe target — it clears the resolution floor and the squared aspect ratio in one shot. Anything larger and still square is also fine; the only hard rule on the low end is staying at or above 600 pixels on the short side.
Six hundred pixels on the short side is the resolution floor the upload validator enforces. Below that, the photo is auto-flagged as too low-resolution before a human ever sees it. The most common way an American photo falls under the floor is not the camera — modern phones shoot far higher than 600 pixels — it is forwarding the photo through a messaging app first. Texting a photo to yourself, or pulling it out of a group chat, can compress it down past the limit. Always use the original file straight from the camera roll, not a re-shared copy.
A square (1:1) crop is the shape the form is happiest with. If your shot is a standard portrait rectangle, crop it square in your phone's Photos app so your head sits centered with a little headroom above and a little space at the shoulders. A square crop also tends to drop the file size at the same time, which conveniently helps with the 2 MB ceiling covered below. Do not stretch or squish the image to force a square — crop it, do not distort it.
One question Americans ask a lot is whether to use the US-style 2×2 inch passport photo or the international 35×45 mm size. For a digital eVisa upload the print dimension barely matters — pixels and file size are what the form reads — but a square crop maps cleanly to the familiar US 2×2 shape, which is why it is the easiest target. Our breakdown of the 2×2 versus 35×45 mm question covers the conversions if you also need a printed photo for something else.
The Cambodia eVisa photo spec is often quoted in the international format — 4×6 cm, or 40×60 mm — because that is the passport-print standard used across most of Asia. Americans, raised on inches and the 2×2 inch passport photo, hit this number and reach for a calculator. Here is the conversion, and the reason it mostly does not matter for an eVisa.
Forty millimeters is about 1.57 inches, and 60 millimeters is about 2.36 inches, so the quoted 4×6 cm print is roughly 1.6×2.4 inches. The familiar US passport photo is 2×2 inches, which is 51×51 mm — square, and slightly wider than the 40 mm international width. Neither print dimension is something you measure for the eVisa, because you never print the photo. The visa is delivered as a PDF and the photo lives inside it digitally.
What this means in practice: ignore the centimeters and the inches, and think in pixels and megabytes instead. The 4×6 cm figure exists so the photo prints cleanly at passport resolution if it ever needs to, but the upload form does not measure your photo in millimeters. It checks that the image is square enough, at least 600 pixels on the short side, a JPEG, and under 2 MB. Hit those four and the print equivalent takes care of itself.
The file format is where the most American photos quietly fail, and it is entirely an iPhone story. Since iOS 11, recent iPhones default to saving photos as HEIC — a high-efficiency format that produces smaller, sharper files than JPEG. It is a genuinely better format. It is also one the Cambodia eVisa upload form does not accept. The form wants a plain JPEG (.jpg), and a HEIC file gets bounced on sight, regardless of how perfect the photo itself is.
There are two ways to handle it, and the first is easier. Before you shoot, open Settings, go to Camera, then Formats, and choose "Most Compatible." That switches the camera to save JPEG instead of HEIC from that point forward, so every photo you take is already in the right format. Switch it back to "High Efficiency" afterward if you prefer smaller files for everyday photos.
If you already shot the photo in HEIC, you convert it. The simplest path on an iPhone is to open the photo, tap the share sheet, and use a "Save as JPEG" or "Copy and convert" option — or, just as reliably, email the photo to yourself or drop it into a document, which forces a JPEG copy. On a Mac, opening the HEIC in Preview and exporting as JPEG does the job. The goal is a file that ends in .jpg, not .heic, before it touches the upload form.
Android users rarely hit this — most Android phones save JPEG straight out of the camera, so the format is a non-issue. The other format that catches Americans is the screenshot: a photo screenshotted off a screen saves as PNG, which the form also rejects, and screenshots are usually low-resolution besides. Use the real photo file, exported as JPEG. Our iPhone photo guide for Americans walks through the HEIC-to-JPEG steps with screenshots if you want to see exactly where each setting lives.
The other half of the file problem is the opposite of low resolution — a file that is simply too large. A full-resolution photo off a modern phone routinely lands between three and eight megabytes, and the upload form caps the photo at 2 MB. A perfectly compliant headshot, true white background and neutral face and all, gets bounced for size alone. The fix is to shrink the file without dropping below the 600-pixel floor, and there are three clean ways to do it.
Do the steps in that order — crop, then resize, then compress only if you still need to — and you almost never reach the point of visible quality loss. The single mistake to avoid is over-compressing: squeezing a photo down to a few hundred kilobytes can introduce the blocky artifacts and smeared skin texture the validator reads as a manipulated or degraded image. Aim to land somewhere between roughly 200 KB and 2 MB, which is a wide, forgiving window.
If your file keeps coming back too large no matter what you try, the most common culprit is uploading the original full-resolution image without cropping it first. Our guide to compressing a Cambodia visa photo that is too large walks through the exact tools on iPhone, Android, Mac, and Windows, with target settings for each. For most Americans, a square crop straight from the phone is all the compression you ever need.
The composition is the part most Americans get right by instinct. The file is the part worth a deliberate 30-second check, because every flag in this guide is a number or a file type, not your face. Run through the same short list every time and the photo clears on the first pass.
If the photo does come back flagged, it is not a denial — you re-upload a corrected version at no extra charge and the 3-business-day clock keeps running. Our guide to fixing a rejected Cambodia eVisa photo maps each flag to its exact fix, and the printable photo checklist for US citizens condenses this whole list onto one card you can keep open while you shoot.
The size-and-file half of the Cambodia eVisa photo comes down to four numbers and one file type: square, at least 600×600 pixels, a JPEG, under 2 MB. Confirm those before you upload and the photo — the field most likely to send an American file back — clears cleanly. The iPhone HEIC default and an oversized original are the two traps; both take under a minute to fix once you know they are there.
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. There is no return flight, hotel booking, or bank statement to upload — your photo and passport scan carry most of the application.
Next steps and related reading for Americans: apply for your Cambodia eVisa once your photo is a square JPEG under 2 MB, review the full photo requirements guide for US citizens for the background and expression rules, see where the photo sits inside the required documents list for Americans, and bookmark our Cambodia visa hub for US citizens as the single reference for cost, documents, and timing.
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