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How to resize a photo to 3.5 × 4.5 cm at 200 or 300 DPI

By the Fusion Office team · Updated

Quick answer

Open Resize image, choose Print size, enter 3.5 × 4.5 cm and the DPI the form asks for, and press Resize. At 200 DPI that's about 276 × 354 pixels; at 300 DPI, about 413 × 531 pixels. Turn on Limit the file size if the form also gives a KB range.

What cm and DPI mean for a digital photo

A digital image only has pixels. Centimetres describe how big it prints, and DPI (dots per inch) says how many pixels go into each inch. So a size in cm only becomes a pixel size once you pick a DPI: pixels = cm ÷ 2.54 × DPI.

  • 3.5 × 4.5 cm at 200 DPI ≈ 276 × 354 pixels.
  • 3.5 × 4.5 cm at 300 DPI ≈ 413 × 531 pixels.
  • 3.5 × 4.5 cm at 100 DPI ≈ 138 × 177 pixels.

If a form says “3.5 × 4.5 cm” without a DPI, 200 DPI is a common choice; if it gives pixels, use those exactly.

Resize step by step

  1. 1Crop the photo to the 7:9 passport shape first with Crop image, so nothing gets stretched.
  2. 2Open Resize image and choose Print size (or the Passport photo 3.5 × 4.5 cm preset).
  3. 3Set the DPI the form asks for.
  4. 4If the form has a KB limit, turn on Limit the file size and enter it.
  5. 5Press Resize and download the JPG.

If the shape doesn't match

When the original photo isn't the same shape, Resize image can crop to fill the new size, add borders, or stretch. Crop to fill keeps faces natural; stretching distorts them, so avoid it for ID photos.

Frequently asked questions

Does DPI change the file?

It changes how many pixels the image has, and so its file size. The DPI value stored in the file only affects printing.

Can I make a small photo bigger?

You can enlarge it, but it won't gain detail. Start from the original camera photo when you can.