Resize Image in cm
Type the width and height in centimetres, set the DPI, and the tool resizes your picture to that size. The DPI is saved inside the JPG or PNG file, so a program such as Word or Photoshop opens it at the size you chose.
Your exact pixel size is kept and the JPEG quality is lowered until the file is just under the limit (1 KB counted as 1,000 bytes, so it passes whichever way a website measures). PNG is saved as JPG when a limit is on, and transparency becomes white.
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Supports: JPG, PNG, WebP • Max 10MB per file • Up to 10 images
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Everything happens in your browser. Pictures are never uploaded to any server.
Pixels, cm, mm or inches
Type the size in the unit your form uses. The DPI is saved inside JPG and PNG files.
Batch Processing
Resize up to 10 pictures at once and download them all as a ZIP.
How to resize an image in centimetres
- Set the width and height above, in pixels, centimetres, millimetres or inches (the size for this page is already filled in).
- Choose how the picture should fit: crop to fill, pad with white, stretch or keep proportions.
- Optionally tick Keep the file under and choose a size such as 20, 50 or 100 KB.
- Drop your JPG, PNG or WebP picture into the box, press Resize and download the result. The file name ends with the new size in pixels.
A size in centimetres only means something together with a DPI (dots per inch), because a picture is stored in pixels. At 300 DPI one centimetre is about 118 pixels, at 150 DPI about 59 and at 72 DPI about 28. Use 300 DPI for print and 72 to 150 DPI for screens, unless a form tells you otherwise.
Centimetres to pixels at 300 DPI
| Size | Pixels |
|---|---|
| 3.5 × 4.5 cm | 413 × 531 |
| 4 × 6 cm | 472 × 709 |
| 5 × 7 cm | 591 × 827 |
| 10 × 15 cm | 1181 × 1772 |
| 21 × 29.7 cm | 2480 × 3508 |
Related size pages
Frequently asked questions
How do I resize an image to a size in cm?
Choose cm as the unit, type the width and height, and keep the DPI at 300 (the usual print resolution) or change it. Add your picture, press Resize and download the result. The tool converts the centimetres to pixels and saves the DPI inside JPG and PNG files.
How many pixels is 1 cm?
It depends on the DPI: 1 cm is about 118 pixels at 300 DPI, 59 pixels at 150 DPI and 28 pixels at 72 DPI. The tool does this conversion for you and shows the pixel size under the width and height boxes.
Will the picture print at exactly that size?
The tool saves the DPI in JPG and PNG files, and programs such as Word, Photoshop and most photo printers use it to place the picture at that physical size. Some print dialogs rescale pictures to fit the paper, so check the scale setting when you print.
Is my picture uploaded to a server?
No. Resizing runs in your browser on your own device, so the picture is never sent to our servers.
How do I resize an image to an exact size?
Add your picture, choose the unit (pixels, cm, mm or inches), type the width and height, pick how the picture should fit (crop to fill, pad with white, stretch or keep proportions) and press Resize. Then download the result.
How do I keep a picture under 50 KB or 100 KB after resizing?
Tick "Keep the file under" and type the size. The tool keeps your exact pixel size and lowers the JPEG quality until the file is just under the limit. If even the lowest quality is too big, it shows the smallest size it reached, and you can use a smaller pixel size or a larger limit.
What is the difference between crop, pad, stretch and keep proportions?
Crop to fill scales the picture until it covers the exact size and cuts off what overflows. Pad with white scales it until it fits inside and fills the rest with white, so nothing is cut off. Stretch forces the exact size and can distort the picture. Keep proportions fits the picture inside your width and height, so one side may end up shorter than you typed.
Does it work with PNG and WebP?
Yes. You can add JPG, PNG and WebP pictures and save the result as JPG, PNG or WebP. With a file size limit, PNG is saved as JPG because PNG files cannot be made smaller by lowering the quality, and transparent areas become white.