Photo To URL logo
Photo To URL

Resize Image in CM

Set an image's width and height in centimetres, with a DPI setting that controls the printed result.

Centimetres Only Mean Something With a DPI

An image file has no physical size of its own - it has pixels. A centimetre measurement only becomes real when you pair it with a resolution, which is what the DPI field does. This page starts at 300 DPI because that is the standard for printing: at that setting, 1 cm is about 118 pixels, so a 10 × 15 cm photo is roughly 1181 × 1772 pixels. Drop the DPI to 96 and the same 10 × 15 cm would only be 378 × 567 pixels, which would print badly. Set the DPI your printer or lab expects first, then type the centimetres you need.

How to Resize an Image

1

Upload your image

Choose a JPG, PNG, WebP, or GIF file. The tool shows its original dimensions and file size straight away.

2

Enter the new size

Pick a unit, type a width or height, and leave the lock on to keep the proportions. Presets like 300 × 300 and 1920 × 1080 are one tap away.

3

Download the resized image

Choose an output format and quality, then save the file at exactly the dimensions you set.

Print Jobs Measured in CM

  • Photo prints in standard 10 × 15 or 13 × 18 cm sizes
  • Images placed into a document laid out in centimetres
  • Posters, flyers and leaflets going to a print shop
  • Certificates and awards with a fixed image area
  • European document photos specified in centimetres
  • Artwork that must match a physical frame size

Resizing in Centimetres

How many pixels is 1 cm?

About 118 pixels at 300 DPI, or about 38 at 96 DPI. The pixel output is shown under the preview so you can always see the real number.

What DPI should I use for printing?

300 DPI is the usual standard for photos and documents. Large posters viewed from a distance can go lower, around 150 DPI.

Why does my image look small on screen after resizing?

Screens ignore DPI and show pixels. A 5 cm image at 96 DPI is only 189 pixels wide, which looks tiny on a monitor but prints at the right size.

Can I switch to millimetres?

Yes - the millimetre resizer works the same way and is handier for document photo standards like 35 × 45 mm.