Nouplo

Resize an image in centimetres

A size on paper, not in pixels — and the file says so.

Drop files here

or click to choose from your deviceAccepted: JPG, JPEG, PNG, WEBP, AVIF, GIF, BMP, HEIC, HEIF

Up to 3 files per runUp to 20 MB per file10 runs per dayRemove limits with Pro✓ Works offline

Your files stay on your device

This tool runs entirely in your browser. Nothing is uploaded, nothing is stored, and you can even turn off your internet connection before you start.

How it works

  1. Add the picture.
  2. Choose centimetres, millimetres or inches, and the resolution you are printing at — 300 dpi for print, 150 for a rough copy.
  3. Type the width, the height, or just one of them to keep the proportions.
  4. Download. The file carries the resolution, so Word, InDesign and a print shop place it at the size you asked for.

Frequently asked questions

Why does the resolution matter?
Because “10 cm wide” is not a property of pixels. A picture is 10 cm wide when its pixels and its stated resolution say so: 1181 pixels at 300 dpi. Without a stated resolution, Word assumes 96 dpi and places the same picture three times too big.
Which formats carry the resolution?
PNG (in a pHYs chunk) and JPEG (in the JFIF header). WebP has no simple way to carry it, so save as PNG or JPEG when the physical size matters.
What resolution should I choose?
300 dpi for anything printed properly, 150 for a rough office print, 600 for line art and fine detail. For the screen, use pixels rather than centimetres — screens do not have a real size.
Will it make a small picture bigger?
It will scale it up, and a picture enlarged past its own detail looks soft. 10 cm at 300 dpi needs about 1200 pixels to start with.

Made for a specific use

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