Resize Image in cm, mm or Inches for free, privately
Forms and print shops often describe a photo in centimetres, such as 3.5 × 4.5 cm, rather than in pixels. The pixel size depends on the resolution: at 300 DPI, 3.5 × 4.5 cm is 413 × 531 pixels. This tool does that calculation for you, crops the photo from the centre so the shape matches, and writes the DPI into the file so software that reads it prints it at the right size.
If the form also has a file-size limit, type it in Maximum file size and the photo is compressed to fit. Everything runs in your browser, so your photos are never uploaded.
How it works
- Add one or more photos.
- Type the width and height, choose cm, mm or inch, and the DPI.
- Optionally type a maximum file size in KB.
- Press Resize photos and download the result.
Frequently asked questions
How many pixels is 3.5 × 4.5 cm?
At 300 DPI it is 413 × 531 pixels; at 200 DPI, 276 × 354 pixels. The pixel size is the centimetres divided by 2.54 and multiplied by the DPI. The tool shows the result size for every photo.
What DPI should I choose?
Use the DPI the form or print shop states. 300 DPI is the most common for printed photos and many application forms. A lower DPI gives a smaller file with fewer pixels.
Will my photo be stretched?
Not with Crop to fill, the default: the photo is trimmed evenly from the centre to match the shape. Choose Stretch only if you want the whole picture squeezed into the new shape.
Are my photos uploaded?
No. Resizing runs in this page on your own device.