How custom dimensions are converted

The tool converts millimetres to pixels using 300 pixels per inch and 25.4 millimetres per inch. For example, 35×45 mm becomes approximately 413×531 pixels. Rounding to the nearest whole pixel is necessary because a digital image cannot contain a fraction of a pixel.

Use an exact source specification

Do not copy a size from a random image or assume a country's passport, visa, ID card and driving licence all use the same format. Find the current instruction from the authority receiving the application, then enter its stated width and height.

Custom-size workflow

Enter the width and height in millimetres.
Confirm the aspect ratio changes in the crop area.
Upload and position a suitable source photo.
Generate the preview and read the output summary.
Download the single photo or 4×6 sheet and verify its pixel dimensions.
Measure a test print if a physical photo is required.

What custom mode cannot decide

Where the eyes and head must sit inside the frame
Allowed background colors and lighting
Whether home printing or online tools are permitted
Required file type, color space or maximum file size
Whether the final photo will be accepted

Frequently asked questions

Can I enter inches?

The custom controls accept millimetres. Multiply inches by 25.4 before entering the value.

Why is the pixel result rounded?

The exact conversion often contains a decimal, but pixel dimensions must be whole numbers. The tool rounds to the nearest pixel.

Can I make a size larger than the 4×6 sheet?

The controls are limited to 10–100 mm. A selected photo must still physically fit within the 4×6 output canvas.