Cambodia eVisa Photo Size and File Format for Americans: Pixels, MB, and JPEG vs HEIC

Millimeters, inches, and the print size most Americans never use

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.

JPEG vs HEIC: the iPhone format trap

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.

When the file is too big: compressing under 2 MB without wrecking it

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.

• Crop to a square first. Cropping away the extra width and height of a portrait photo removes pixels you do not need and often drops the file under 2 MB on its own — no quality loss in what remains, because you are deleting background, not compressing your face.
• Resize to around 600 to 1000 pixels on the short side. A square photo at roughly 600-1000 pixels is comfortably above the resolution floor and almost always well under 2 MB. Your phone's Photos editor or any basic resize tool handles this in seconds.
• Re-save as a JPEG at slightly lower quality. JPEG is a lossy format, so saving at 80-90% quality cuts the file size meaningfully while staying visually clean. Avoid dropping below about 70%, where compression artifacts start to show on the face and the validator can flag a degraded image.

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.

Your 30-second file check before you hit upload

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.

• Is it a JPEG? Confirm the file name ends in .jpg, not .heic or .png. This is the number-one US flag, and it is invisible until the form rejects it.
• Is it square? A 1:1 crop with your head centered, a little headroom above, and your shoulders showing at the bottom.
• Is it at least 600 pixels on the short side? If you cropped or resized, double-check you did not drop below the floor.
• Is it under 2 MB? Most cropped square JPEGs land well under; if yours is over, crop tighter or resize before compressing.
• Is it the original, not a re-shared copy? A photo pulled from a text thread or group chat may be compressed below the resolution floor. Use the file straight from the camera roll.
• No filter, no beauty mode? Heavily smoothed skin reads as a manipulated image. Natural skin texture passes; processed photos get flagged.

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.

Get the file right, then apply

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.