Set a new width or height in pixels, percent, cm, mm or inches. Resize one photo or a whole batch.
- 100% free
- No sign-up
- Files never leave your device
- Batch + ZIP download
This free image resizer changes the width and height of your pictures. You can resize an image in pixels for a website. You can resize in cm or inches for printing and forms. The shape stays the same unless you turn that off.
How to resize an image
- Pick the unitChoose pixels, percent, centimetres, millimetres or inches.
- Type the new sizeEnter a width. Leave height empty to keep the shape. Or enter both.
- Add your imagesThe tool resizes them right away. Change a setting and press Resize again.
- DownloadSave each image or get them all in a ZIP.
Pixels, cm or inches: what is the difference?
Screens think in pixels. Printers think in centimetres or inches. DPI links the two. It means how many pixels fit in one inch on paper.
Here is an example. A photo that must be 3.5 × 4.5 cm at 300 DPI needs 413 × 531 pixels. The tool does this maths for you. Just pick Centimetres, type the size and choose the DPI.
| Size on paper | At 150 DPI | At 300 DPI |
|---|---|---|
| 3.5 × 4.5 cm | 207 × 266 px | 413 × 531 px |
| 2 × 2 inches | 300 × 300 px | 600 × 600 px |
| A4 (21 × 29.7 cm) | 1240 × 1754 px | 2480 × 3508 px |
| 6 × 4 inches | 900 × 600 px | 1800 × 1200 px |
Common pixel sizes
| Use | Size |
|---|---|
| Blog or article photo | 1200–1600 px wide |
| Full-width website banner | 1920 px wide |
| Instagram square post | 1080 × 1080 px |
| Instagram or WhatsApp story | 1080 × 1920 px |
| YouTube thumbnail | 1280 × 720 px |
| Profile picture | 400 × 400 px |
Our test: what resizing does to file size
Smaller pixels, much smaller files
We resized a 12-megapixel test photo (4000 × 3000, 2.77 MB) with this tool. We kept the shape and saved as JPG at 90% quality.
Halving the width cut the file by about 85%. Half the width means four times fewer pixels, and a lighter save setting did the rest. So if a file is too big, resizing is often the fastest fix.
Should you keep the aspect ratio?
Yes, in most cases. The aspect ratio is the shape of the picture. If you turn it off and type both width and height, faces and objects can look stretched. When you need an exact box, crop the picture first with our Crop Image tool. Then resize it here.
Making a picture bigger? Resizing up adds pixels but not detail. A small photo enlarged a lot will look soft. Always start from the largest original you have.
Frequently asked questions
How do I resize an image in cm?
Choose Centimetres in the first box. Type the width and height in cm. Pick 300 DPI for print or forms. Then add your image.
How do I resize a photo without losing quality?
Making a photo smaller keeps it sharp. Making it bigger can make it soft. Save as PNG if you need zero compression.
Can I resize many images at once?
Yes. Add a whole folder of images. They all get the same new size.
Does resizing change the file size?
Yes. Fewer pixels make a smaller file. To hit an exact KB limit, use our Image Compressor after resizing.
Are my images uploaded?
No. Everything happens in your browser.
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Final thoughts
Most image problems come down to size. A website wants 1200 pixels. A form wants 3.5 × 4.5 cm. A printer wants 300 DPI. This image resizer handles all of these in one place. You can work in pixels, percent, centimetres, millimetres or inches. The tool keeps the shape of your picture so nothing looks stretched.
Our test showed that halving the width cut a 2.77 MB photo down to 439 KB. So resizing is also the quickest way to make heavy photos lighter. Resize first, then compress if you still need a smaller file. Keep your originals safe in case you need a bigger copy later.