# Print Photo Size Tool

Convert millimetres and DPI to exact output pixels.

[Open this tool](https://whatson.pk/image-print-photo-tool/)

Category: Image Preparation

Print dimensions need a DPI basis before they can be expressed as image pixels.

Enter millimetres and resolution, then review the output against the original detail.

## Inputs and controls

* One image or a batch: JPEG; PNG; WebP. Static images. Up to 4 MiB per file, 12 MiB total and 4 million pixels per image. At most six source images.
* Width in millimetres. Allowed range: 1 to 300
* Height in millimetres. Allowed range: 1 to 300
* Print DPI. Allowed range: 72 to 600
* Fit behaviour: Fill with crop; Whole image with canvas
* Canvas background

## How to use

* Choose a static JPEG, PNG or WebP source. Check the displayed upload limits before processing.

* Set Width in millimetres, Height in millimetres, Print DPI, Fit behaviour and Canvas background. Review the selected units and options before preparing the output.

* Select Prepare image. Inspect the resulting preview, dimensions and file size, then download the output you need.


## Why use this tool

The conversion connects physical size with a specific pixel target.


## Before relying on the result

Compare the finished picture with its source. Source resolution limits real detail, and printer scaling must also be checked.

## Questions

### Will higher DPI create new photographic detail?

No. Source resolution limits real detail, and printer scaling must also be checked.

### What should I check before using Print Photo Size Tool?

Prepare a supported source image and check Width in millimetres, Height in millimetres, Print DPI and Fit behaviour. Use the exact units shown beside the controls and replace any example values with your own inputs.

Source page last modified (UTC): 2026-10-04T18:22:35+00:00

This profile describes the tool. It does not execute it or supply a professional certification.