What size is a Vietnamese ID photo?

The two common sizes are 3×4 cm and 4×6 cm. At 300 DPI that is 354×472 and 472×709 pixels respectively, which is what a print shop expects.

Why does my passport photo keep getting rejected online?

Usually one of three constraints rather than the picture itself: wrong pixel dimensions, no resolution written into the file so it prints at the wrong physical size, or a file larger than the portal's cap. All three have to be satisfied at once.

What does DPI mean for a passport photo?

It is how many pixels make up one printed inch. A 35×45mm photo at 300 DPI needs 413×531 pixels. Without a resolution stored in the file, printing software guesses and the photo comes out the wrong physical size.

Is my photo uploaded to a server?

No. Cropping, resizing and encoding all happen in your browser, which matters for a photograph of your own face.

Passport & ID Photo

Exact millimetres, the right resolution written into the file, and a size cap if the portal sets one — the three things that get photos rejected, handled together. Nothing is uploaded.

Drop a photo here

or click to browse

JPEG, PNG, WebP • Max 30MB

Three constraints, not one

A rejected ID photo is almost never about the photograph. It is about arithmetic, and there are three sums that all have to come out right:

Physical size — 3×4 cm, 35×45 mm, 2×2 inches, depending on the country.
Resolution — how many pixels make up each printed inch, normally 300 DPI. This decides the pixel dimensions: 35mm at 300 DPI is 413 pixels.
File size — many portals cap the upload, and the US State Department for instance sets 240KB.

Most online tools handle one of the three. Getting a photo through usually means bouncing between a cropper, a resizer and a compressor, with each step undoing the last. Here they are one operation.

Common sizes

Vietnam 3×4 cm	354 × 472 px at 300 DPI
Vietnam 4×6 cm	472 × 709 px at 300 DPI
Schengen / UK / India 35×45 mm	413 × 531 px at 300 DPI
US 2×2 in	600 × 600 px at 300 DPI, max 240 KB
China visa 33×48 mm	390 × 567 px at 300 DPI
Canada 50×70 mm	591 × 827 px at 300 DPI

Why the resolution has to be inside the file

Pixels alone do not describe a physical size. A 413×531 image is 35×45 mm at 300 DPI and 145×187 mm at 72 DPI — the same pixels, printed very differently. The number that decides which is a field stored in the JPEG.

Plenty of tools produce the right pixel count and leave that field at 72, and the print shop then outputs a photo four times too large. This page writes the resolution into the file. You can also set it on an existing photo with Set image DPI.

What this does not do

It frames, resizes and encodes. It does not check that your head is the regulation percentage of the frame, remove the background behind you, or judge your expression. The guides on the preview are a rule of thumb, not a compliance check — read the requirements for the country you are applying to.

Frequently asked questions

Can I print several on one 4×6 sheet?

Not here. Make the single photo at the right size, then arrange copies in any document editor for printing.

The background behind me is not white

The background option fills the area around your photo, it does not cut you out. For a true white background you need a plain wall or proper background removal.

My portal wants a smaller file than I can reach

Lower the DPI to 300 if you set it higher — resolution multiplies the pixel count, and pixel count drives file size far more than quality does.

Related tools

Compress to a target size — when only the file size is the problem
Set image DPI — fix the resolution on a photo you already have
Resize image — plain pixel dimensions