Resize image in cm

Set the size in centimetres, millimetres or inches and choose the DPI.

Forms often ask for "3.5 cm × 4.5 cm" without saying how many pixels that is. At 300 DPI, 3.5 × 4.5 cm is 413 × 531 px; at 200 DPI it is 276 × 354 px. This tool does the conversion and writes the DPI into the JPG so it prints at the right size.

Size200 DPI300 DPI
3.5 × 4.5 cm276 × 354 px413 × 531 px
2 × 2 in (5.1 cm)400 × 400 px600 × 600 px
2.5 × 3.5 cm197 × 276 px295 × 413 px
A4 (21 × 29.7 cm)1654 × 2339 px2480 × 3508 px

How to use it

  1. Choose your image or drop it on the box (you can also paste from the clipboard).
  2. Adjust the settings if you need to. The tool resizes it straight away.
  3. Check the new size, then press Download.

Questions

What DPI should I use?

300 DPI for printing photos, 200 DPI for most online forms that specify cm.

Does it change the DPI in the file?

Yes, for JPG output the DPI is written into the file header.

Are my files uploaded to a server?

No. The tool runs entirely in your browser using JavaScript, so your files never leave your device. You can even disconnect from the internet after the page loads and it keeps working.

Guides

All guides
Image tools · 23 Oct 2026Crop Image to Passport Size: in cm, Pixels or KB (Phone, Mac, PC)Crop any photo to passport size (3.5 x 4.5 cm or 2 x 2 inch), then set exact cm, pixels and KB. Free in your browser, plus Mac and laptop methods.Image tools · 23 Oct 2026How to Make a Passport Size Photo at Home (India & US)Take and crop a passport size photo at home: India 35 x 45 mm, US 2 x 2 inch, plus background, face size, glasses and printing tips.Image tools · 23 Oct 2026How to Print Passport Size Photos at Home (A4, 4x6, Word)Print passport size photos at home: fit 8 on 4x6 or 25–30 on A4 in Word, the right print settings and paper, and how to keep the size exact.2027CATExpected · check official noticeCAT 2027 Registration Date, Photo & Signature SizeNotification: Late July 2027 (expected)

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