Resize Image in CM, MM or Inches
Type a size in centimetres, millimetres or inches and a DPI, crop to that shape, and download a JPG that prints at exactly that size, under a KB limit if you need one.
Copy these numbers from the official instructions for your application.
Drop your photo
or
JPG, PNG, WebP, HEIC · up to 50 MB · one image at a time · or paste with Ctrl+V
Processed locally — your image never leaves your device.
Photo size in cm, mm and pixels
| Size | At 200 DPI | At 300 DPI |
|---|---|---|
| 3.5 × 4.5 cm (35 × 45 mm) | 276 × 354 px | 413 × 531 px |
| 5 × 5 cm (50 × 50 mm) | 394 × 394 px | 591 × 591 px |
| 6 × 2 cm (signature) | 472 × 157 px | 709 × 236 px |
Resize image in cm and KB together
Many forms give a print size and a file limit, such as 3.5 × 4.5 cm under 50 KB. Enter both: the crop sets the shape, the DPI sets the pixels, and the quality is lowered only as far as the limit needs. Switching units keeps the same real size, so 35 mm becomes 3.5 cm.
Only need a different DPI?
If the pixels are already right and only the DPI value is wrong, use change DPI of image, which keeps the file untouched. For official passport sizes by country, use the passport photo resizer.
Privacy: your image stays on your device
Your image is cropped and resized on your device, never uploaded.
Read the privacy policy or see how the tools work for details.
Frequently asked questions
How do I resize an image to 3.5 × 4.5 cm?
Drop the photo, keep Centimetres, enter 3.5 and 4.5 and a DPI (300 is standard), then adjust the crop and select Create photo. At 300 DPI that's 413 × 531 pixels.
How are centimetres turned into pixels?
Pixels = centimetres ÷ 2.54 × DPI, or millimetres ÷ 25.4 × DPI. At 200 DPI, 6 × 2 cm is 472 × 157 pixels. The DPI is also saved in the JPG so it prints at that size.
Can I resize in cm and keep it under 50 KB?
Yes. Fill in Max file size; the pixel size never changes, only the JPG quality. Some forms also set a minimum, which you can enter too.
Which DPI should I use?
Use the DPI your form or printer asks for. Without one, 300 is the usual choice for prints and photo labs; a lower DPI gives fewer pixels and a smaller file.
Does it stretch my photo?
No. You choose which part to keep with the crop box, which has the exact shape of the size you entered, so the result is never squashed.
Is my image uploaded?
No. Cropping, resizing and saving all happen in your browser.
Related tools
- Change the DPI of an imageCheck the DPI of a JPG or PNG and change it to 300, 200 or any value without touching its pixels or quality.
- Resize a photo for a passport or visa applicationCrop and resize a photo to a passport or application size in pixels, millimetres and KB.
- Resize an image to new dimensionsChange width and height in pixels or by percentage, with aspect ratio locked by default.
- Resize an image to 50KB, 100KB or any sizeHit a file size limit such as 20 KB, 50 KB, 100 KB or 200 KB for forms and uploads.
- Crop an image to any aspect ratioCrop photos freely or to 1:1, 4:3, 16:9, 3:2 or a custom ratio, with zoom and rotation.
- Check passport photo size by countryOfficially sourced passport photo sizes by country, with a tool to make a photo that matches.