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Resize Image in cm

Type a width and height in centimetres, choose a DPI, and get an image with exactly the matching number of pixels.

Drag and drop an image here

JPG, PNG, WebP, AVIF, HEIC, GIF or BMP · one file · up to 50 MB

Your image stays on this device and is never uploaded.

How to use the Resize Image in cm

  1. Choose an image, or drag it onto the drop area. It stays on your device.
  2. Pick Centimetres, then enter the width and height you need. With Lock aspect ratio on, the second value follows the first so the picture is not squashed.
  3. Check the DPI. It only decides how many pixels each unit holds, so the same size at a higher DPI gives a bigger, sharper file.
  4. Choose JPG, PNG or WebP and, for JPG or WebP, the quality. The preview shows the new pixel size before you save.
  5. Press Resize image, then download the result. The original file is never changed.

About this tool

A picture file does not have a printed size on its own. It is a grid of pixels, and centimetres only appear once you decide how many pixels fit in an inch. This page does that sum for you: pixels = centimetres ÷ 2.54 × DPI. A 6 cm × 4 cm image at 300 DPI is 709 × 472 pixels, and the same 6 × 4 cm at 72 DPI is only 170 × 113 pixels.

Forms that ask for a size in centimetres usually expect the picture to look right when printed or placed in a template, not a specific DPI tag. That is why the tool lets you pick the DPI yourself. Use 300 for anything that will be printed, and 96 or 150 when the image only has to look correct on a screen or fit under a size limit.

The saved file does not carry a DPI value that every program respects, so a viewer may still describe it by its pixel count. The pixel count is the part that is exact, and it is shown before you download.

Practical uses

  • Making a photo that prints at a stated width and height, such as 9 × 13 cm.
  • Filling a template or document box that is specified in centimetres.
  • Matching a form that says a picture must be, for example, 3.5 cm wide.

Tips for better results

  • Leave Lock aspect ratio on unless you really want to stretch the picture.
  • If you need an exact shape that differs from the photo, crop to that shape instead, so nothing is distorted.
  • Raise the DPI, not the centimetres, if the result looks too small or soft.

Frequently asked questions

How do I convert centimetres to pixels?

Divide the centimetres by 2.54 to get inches, then multiply by the DPI. At 300 DPI, 1 cm is about 118 pixels.

What DPI should I use?

300 DPI is the usual choice for print. For a screen or an upload with a file-size limit, 96 to 150 DPI is usually enough.

Will the image be stretched?

Not while Lock aspect ratio is on. If you turn it off and enter a shape that differs from the original, the tool warns you that the picture will look stretched.

Is my image uploaded?

No. The file is read and rewritten in your browser, and it never leaves your device.

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Privacy

Your image is processed in your browser on your own device. It is not uploaded to Paul Digital or any other server, and nothing is stored once you close the page.