Resize Image in CM — AI-Accurate, Print-Ready, Instant
To resize an image in cm, upload your photo, type the width and height in centimetres,
choose a DPI (300 for print), and download the result. The engine converts centimetres to pixels with one
formula: pixels = cm ÷ 2.54 × DPI. A 3.5 × 4.5 cm passport photo at 300 DPI
comes out at 413 × 531 pixels.
01 · Source
JPG · PNG · WebPDrop images here
or click to browse — files never leave your device
02 · Target size
—03 · AI lab
runs locally04 · Advanced
Transform
Colour & sharpness
Background cutout settings
Higher tolerance removes more of the background but may eat into the subject. Best results come from photos shot against a plain wall.
05 · Output
Preview
load an image to beginWhy an image doesn't really have a size in centimetres
A digital photo is a grid of pixels. Centimetres only appear when that grid is printed or placed on a page, and the DPI (dots per inch) value decides how many pixels fit into each inch.
Take one image that is 1181 pixels wide:
- At 300 DPI it prints about 10 cm wide.
- At 150 DPI it prints about 20 cm wide.
- At 72 DPI it prints about 41 cm wide.
The pixels never changed. Only the DPI instruction did. That's why a tool that resizes in cm has to ask for a DPI too.
01 The formula, with examples
| Length | At 72 DPI | At 150 DPI | At 300 DPI | At 600 DPI |
|---|---|---|---|---|
| 1 cm | 28 px | 59 px | 118 px | 236 px |
| 5 cm | 142 px | 295 px | 591 px | 1181 px |
| 10 cm | 283 px | 591 px | 1181 px | 2362 px |
Worked example: you need a photo 4.5 cm tall at 300 DPI. 4.5 ÷ 2.54 = 1.772 inches, and 1.772 × 300 = 531 pixels.
02 How to resize image in cm, step by step
Upload your image
JPG, PNG or WebP. Everything is processed inside your browser.
Enter width & height in cm
For example 3.5 × 4.5 for a passport-style photo.
Choose your DPI
300 for anything printed, 150 for posters, 72–96 for screen-only use.
Pick how to handle proportions
Maintain proportions locks the ratio so nothing is squashed. Stretch to fit forces your exact numbers and can distort faces.
Click Resize and download
Check the preview first.
Common sizes in cm and their pixel dimensions
Requirements for passports and visas differ by country and can change. Always check the issuing authority's current rules before submitting.
| Use | Size (cm) | Pixels at 300 DPI |
|---|---|---|
| Passport / visa photo (UK, EU, Australia) | 3.5 × 4.5 | 413 × 531 |
| Small ID photo | 2.5 × 3.5 | 295 × 413 |
| US passport photo (2 × 2 in) | 5.08 × 5.08 | 600 × 600 |
| Canadian passport photo | 5 × 7 | 591 × 827 |
| Photo print 4 × 6 in | 10.16 × 15.24 | 1200 × 1800 |
| Photo print 10 × 15 cm | 10 × 15 | 1181 × 1772 |
| A6 | 10.5 × 14.8 | 1240 × 1748 |
| A5 | 14.8 × 21 | 1748 × 2480 |
| A4 flyer or document | 21 × 29.7 | 2480 × 3508 |
| Business card | 9 × 5.5 | 1063 × 650 |
03 Which DPI should you choose?
- 300 DPI: photo prints, brochures, ID photos, anything held in the hand.
- 150 DPI: posters and banners viewed from a distance.
- 72 to 96 DPI: screen-only images. DPI barely matters on screens, because pixel dimensions control how large an image appears.
- 600 DPI: fine line art or small, detailed prints. It makes files much larger, and for photos it rarely shows a visible benefit.
04 Stretch, maintain proportions or crop?
If your photo is 4:3 and you ask for a 3.5 × 4.5 cm result, the shapes don't match. You have three options:
- Maintain proportions: one side hits your target and the other is smaller. Nothing is lost, but the size isn't exact.
- Stretch to fit: hits both numbers but distorts the image. Avoid it for faces.
- Crop to fit: fills the exact size by trimming the edges. This is usually the best choice for ID photos.
05 Will quality suffer?
Making an image smaller keeps it sharp. Making it larger does not add detail. If you ask for 20 cm at 300 DPI you need about 2362 pixels of width. If your original has far fewer, the print will look soft, because the software can only guess at the missing pixels. For best results, start from the largest original you have.
06 Which file format should I use?
- JPG: best for photographs, and accepted by almost every government and job portal.
- PNG: best for logos, screenshots and transparency, but files are larger.
- WebP: smaller files for websites, though some print shops and forms don't accept it yet.
07 My image still prints at the wrong size in Word or Canva. Why?
Most programs place an image using its stored DPI value. If that value is missing or differs from what you chose, the program falls back to its own default and the image appears larger or smaller than expected. Resize the placed image to the exact cm in your layout program, or check the DPI setting in your export options.
08 Is it private?
Our resizer runs entirely in your browser, so your photo is never uploaded to our servers. The AI features — smart crop, face-aware framing, background cutout and auto-enhance — all run on your own device.
09 Who needs to resize images in cm?
Students & job seekers
Match the photo size on application forms and portals without trial and error.
Travellers
Prepare passport or visa photos at the exact centimetre size your authority requires.
Online sellers
Match marketplace image guidelines. Most marketplaces specify pixels, so convert first.
Designers & print shops
Prepare flyers and cards at the correct physical size, with embedded DPI metadata.
Frequently asked questions
Quick answers about centimetres, pixels, DPI and print quality.
How do I resize image in cm?
How many pixels is 1 cm?
What size in cm is a passport photo?
What is the best DPI for printing?
Does resizing reduce image quality?
Can I resize image in cm without losing proportions?
Is the tool free?
What is the difference between resizing and changing DPI?
Key takeaways
- Centimetres only mean something once DPI is set.
- Use pixels = cm ÷ 2.54 × DPI to check any size yourself.
- Use 300 DPI for print, crop instead of stretching, and avoid enlarging small images.
Try it free — resize your image in CM now
Stop guessing at pixel dimensions. Enter the centimetres your document, form or print shop asks for, pick a DPI, and get a file that lands exactly on target.