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PerfectUpload

Resize Image in cm, mm, inches or pixels

Exact dimensions for print or screen. Type the size in the unit your form uses, and the tool works out the pixels.

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How to use it

  1. Drop your image.
  2. Choose Resize to keep everything in view, or Crop to exact size to fill the frame.
  3. Enter width and height in pixels, cm, mm or inches, and set the DPI for print sizes.
  4. Pick a format, optionally a maximum KB, and download.

Pixels, centimetres and DPI explained

Pixels are what a screen or upload portal measures. Centimetres and inches matter only when printing, and DPI (dots per inch) links the two: pixels = inches × DPI. A 2 × 2 inch photo at 300 DPI is 600 × 600 pixels.

Frequently asked questions

How many pixels is 3.5 × 4.5 cm?

At 300 DPI it's 413 × 531 pixels. At 200 DPI it's 276 × 354 pixels. The tool converts automatically when you choose cm and set the DPI.

What DPI should I use?

300 DPI for anything printed, like photos and ID cards. Screen-only images don't really use DPI, so leave it at 300 unless a form asks for something else.

Will resizing reduce quality?

Making an image smaller keeps it sharp. Making it much larger than the original can't add detail, so it may look soft.