The documents needed for a Cambodia eVisa are simple — a passport scan and a photo. What flags American files is not the documents, it is the scan quality. Here is how to upload both so they clear on the first try.

Lay your US passport flat on a dark surface, light it with daylight from a side window (never the flash), and shoot the bio page from directly above so both edges are in frame and every character of the machine-readable zone is legible. For the photo, use a plain white wall, neutral expression, no glasses, and save it as a JPEG around 600×600 pixels or larger. The documents needed are just the passport scan and the photo — what flags American files is glare, blur, cropped corners, or a filtered image, and every one of those is a free re-upload that keeps the 3-business-day clock running.
The documents needed for a Cambodia eVisa are about as light as travel paperwork gets for US citizens: a scan of your passport bio page and a passport-style photo. That is the part travelers worry about, and it is rarely the part that goes wrong. What actually bounces an American file back to the inbox is scan quality — a blown-out laminate, a soft-focus photo, a corner cropped off the page, a file the size of a small movie. The document is fine. The capture is not.
On the Rejection & Resubmission desk, the same handful of upload problems repeat week after week. They are all avoidable, and none of them need a scanner, a photo studio, or any gear beyond the phone already in your pocket. The trick is knowing exactly what the upload validator looks for before you hit submit, so the file clears on the first pass instead of costing you a day.
Cambodian Immigration needs to read every detail on your US passport bio page — full name, passport number, date of birth, issue and expiry dates, and the two lines of the machine-readable zone at the bottom. That is the whole job of the scan: legibility. A phone camera does this better than most home scanners, because you control the angle and the light. You do not need a flatbed.
Put the passport flat on a clean, plain, ideally dark surface. A wooden desk or a dark notebook works well, because contrast makes the page edges sharper for the upload validator to detect. Open it fully so the bio page lies flat with no curl at the spine. Press the page down gently if it lifts. Use daylight coming in from a side window, never the camera flash — the flash bounces straight back off the laminate and washes out the middle of the page where your number and name sit.
Hold the phone directly above the open passport, parallel to the page, at about a foot. Tap the screen to focus on the printed text before you shoot, and wait for it to lock — a half-second of patience here saves a resubmission. Frame both edges of the page with a thumb-width of margin on all four sides. The single most common scan rejection for US applicants is a corner of the bio page cropped out of frame, so give yourself room rather than filling the shot edge to edge.

Most scan flags come down to three things: glare, blur, and framing. Each has a specific fix, and once you know the move, you will not hit it again. These are the patterns we see most often on US passport uploads, in order of how frequently they bounce a file.
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Se você precisa de um Cartão e-Arrival do Camboja (e um eVisa do Camboja) durante uma escala no Aeroporto Internacional Techo (KTI) ou Siem Reap (SAI) depende de uma pergunta: você vai cruzar a linha de imigração? Aqui está o regulamento exato de 2026 para transferências airside, passagens separadas e voos domésticos.
As regras de fronteira do Camboja mudaram significativamente para 2026: Phnom Penh abriu o Aeroporto Internacional Techo (KTI), selos de papel foram substituídos pelo V-Pass digital, e todas as passagens terrestres entre Tailândia e Camboja permanecem fechadas. Aqui está a lista de verificação completa de entrada de 2026 para viajantes canadenses.
Cidadãos britânicos que viajam para o Camboja em 2026 precisam tanto de um visto cambojano válido quanto de um Cartão e-Arrival digital do Camboja (CeA). Aqui está como os portadores de passaporte do Reino Unido escolhem entre o eVisa de Turista (Classe T), eVisa Ordinário (Classe E) e Visto na Chegada no Aeroporto Techo (KTI) ou Siem Reap (SAI).
A blurry scan rejected at upload is the single most fixable problem in the whole application. None of these require a retake of more than a minute, and none cost a cent. If your first capture is borderline, take three or four and pick the sharpest — phones are free to shoot, and the validator only ever sees the one you choose to upload.

The photo is the other half of the documents needed, and it carries its own upload rules. The Cambodia eVisa wants a recent passport-style headshot against a plain white or off-white background, sized as a 4×6 cm equivalent, face fully visible, head centered, neutral expression — no smile, no glasses, no hats. Most American applicants shoot this on a phone against a white wall, and it clears every time when the file itself is right.
File format and size trip up more US applicants than the pose. Save the photo as a JPEG, ideally 600×600 pixels or larger. Modern iPhones shoot in HEIC by default, which the upload may not accept, so convert to JPEG first — in the Photos app you can export or share it as a JPEG copy. Avoid uploading the raw 12-megapixel original; an oversized file can be refused outright, and you only need a clean square crop of your head and shoulders, not the whole room behind you.

A flagged upload is not a rejection of your trip, and it is not a lost fee. It is a request to re-upload a cleaner file, and it is one of the most routine things that happens on an application. You get an email with a clear, specific list of what to redo — usually a fresh photo against a white wall, or a passport scan without glare. There is no extra charge to fix it.
Speed is the only thing that matters once you are flagged. Reply with the corrected file quickly and the 3-business-day clock keeps running rather than resetting from scratch. Free resubmission is part of the all-in price for both the Tourist eVisa at $80 USD and the Business eVisa at $90 USD, so you are not penalized for needing a second go at the upload. Open the email, read the exact reason, fix that one thing using the moves above, and re-upload — most corrected files clear on the next pass.
