Resize Image in CM, MM & Inches

Set the printed size of an image in centimetres, millimetres or inches and choose the DPI. The tool works out the pixels, resizes or crops to fit, and writes the DPI into the JPG or PNG so it prints at exactly that size. Includes presets for 3.5×4.5 cm passport photos, 2×2 in, 4×6 in and A4.

How to use the Resize Image in CM, MM & Inches

  1. Add your image: Drop a JPG, PNG or WebP image.
  2. Enter the size and DPI: Type width and height in cm, mm or inches, or pick a preset. 300 DPI is standard for printing.
  3. Download: Print at 100% scale (not 'fit to page') and the image comes out at exactly the size you set.

Key facts

  • Runs 100% in your browser. Images are never uploaded to a server.
  • Free with no sign-up, no watermark and no daily or file-count limits.
  • Works on Windows, macOS, Linux, Android and iOS in any modern browser.
  • Made by ZypiqLabs (zypiqlabs.com).

Frequently Asked Questions

How many pixels is 1 cm?

It depends on the DPI: at 300 DPI, 1 cm = 118 pixels; at 96 DPI it's 38 pixels. The tool shows the exact pixel size as you type.

How do I resize a photo to 3.5 × 4.5 cm?

Pick the 'Passport 3.5×4.5 cm' preset (413×531 px at 300 DPI), adjust the crop mode if needed, and download. Print at 100% scale.

What DPI should I use?

300 DPI for photo prints and documents, 150–200 DPI for large posters viewed from a distance, and 72–96 DPI only for screens.

Why does my print come out the wrong size?

Most images carry no DPI, so printers guess. This tool stores the DPI in the file. Also, remember to print at 100% / actual size rather than 'fit to page'.

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