Digital passport photo requirements

Why pixels and kilobytes fight each other

A portal sets a minimum pixel dimension so the photo carries enough detail, and a maximum file size so its storage and processing stay predictable. The trouble is that more pixels means a bigger file. The United States is the sharpest example: at least 600 by 600 pixels, but no more than 240 KB. A high-quality 600x600 JPEG straight from a phone typically lands between 300 and 500 KB, so it fails. Compress it too hard and it becomes blocky enough to be refused for quality instead.

The correct answer is not a fixed compression setting, it is a search: find the highest JPEG quality that still fits under the ceiling. That is what happens automatically when you download from this page, and you can also do it manually with the resize in KB tool.

Minimum file sizes are real too

Some portals set a floor as well as a ceiling. Chinese visa uploads must be between 40 KB and 120 KB. Indian e-Visa uploads must be at least 10 KB. A small image of a face on a plain white background compresses extremely efficiently and can genuinely land below the floor at perfectly good quality, at which point it is rejected for being too small. We pad the file to clear the minimum rather than degrading the image to inflate it.

The DPI problem nobody warns you about

This one affects printing rather than uploading, and it is silent. When a browser exports a canvas to JPEG it writes a pixel density of 1 by 1 with no units, meaning the file declares no physical size at all. Printers and photo labs then apply their own default scaling, so a pixel-perfect 50 by 70 mm crop comes out at the wrong physical size on paper.

We patch the JFIF density fields on every export so the file carries a true DPI. That is why a print from here measures what it should when you put a ruler on it, and it is worth checking with any other tool you use.

Which resolution should you actually choose?

Treat a published minimum as a floor, not a target. If a portal asks for at least 420 by 540 pixels and allows 4 MB, upload something several times larger than the minimum. A file at exactly the minimum resolution looks soft once the authority prints it onto a physical document, and "poor quality" is a rejection reason in its own right.

For printing, 300 DPI is the practical standard and what we use by default. Some authorities request 600 DPI for digital submissions, which is why the IRCC preset renders at 600.