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Image Resizer in MM, CM, and Inches

Convert a physical print size and selected PPI into exact pixel dimensions, then resample locally.

Use the tool

Prepare your file

JPG, PNG, WebP · up to 25 MB · 40 megapixels

Drop an image here

JPG, PNG, or WebP · up to 25 MB

Processed in this browser tab. No file upload is used.
Choose an image to start.

How it works

Three clear steps

  1. 01

    Choose an image.

  2. 02

    Enter the width, height, unit, and PPI required for printing.

  3. 03

    Process and verify the calculated output pixels before downloading.

What this tool does

Keep physical size, pixels, PPI, and file size clearly separated.

Accepted inputJPG, PNG, WebP · up to 25 MB · 40 megapixels
Processing locationThis browser tab
Account requiredNo
Output validationSignature, byte count, and tool constraints

How this result is produced

Physical measurements are converted to pixels using the selected PPI: pixels equal the requested inches multiplied by PPI. The image is then resampled to those calculated dimensions.

Practical example

For 35 × 45 mm at 300 PPI, calculate width as 35 ÷ 25.4 × 300 ≈ 413.386 pixels and height as 45 ÷ 25.4 × 300 ≈ 531.496 pixels. The tool rounds to 413 × 531 pixels using its rounding rule. This changes the pixel grid; a PPI metadata change alone would not. Check the final bytes separately.

Read the guide to pixels, PPI, format, and file-size terms

Limits and troubleshooting

  • PPI describes pixel density for physical output; it does not guarantee printer behavior.
  • Upscaling does not add real photographic detail.

Check the selected unit before processing: 35 inches is very different from 35 millimetres. If the calculated pixel dimensions are unusually large, lower the physical size or PPI to a value the intended print workflow actually requires.

Questions people ask

Is DPI the same as pixels?

No. Pixels are the image dimensions. PPI/DPI relates those pixels to a physical print size. File size in KB is a separate property.

Calculate the pixels before printing

Entered sizeAt 300 PPIRounding
35 × 45 mm413 × 531 pixelsEach edge is rounded to the nearest whole pixel.
2 × 2 inches600 × 600 pixels2 multiplied by 300 on each edge.
10 × 15 cm1181 × 1772 pixelsConvert centimetres to inches before multiplying.

Pixel rounding makes the effective physical measurement approximate. JPG and PNG can store the selected density; this workflow does not write a standardized WebP print-density tag. In the print dialog use actual size, and measure a test print when physical size is important.