Resize photo
Set the width and height you need. Use pixels for screens, or centimetres and DPI for a deliberate print size.
How it works
- Choose your imageRead its original pixel dimensions.
- Enter dimensionsChoose units, DPI and whether to preserve the ratio.
- Check the resultReview the new dimensions and download the JPG.
Related image tools
Pixel dimensions and file size are different
Resizing changes the number of pixels across and down your image. Compression changes how much data is needed to store it. A 1200×800 image can have many different byte sizes, depending on its content, format and JPG quality.
Choose pixels when you have a screen or upload requirement such as a 1200-pixel width. Keep aspect ratio checked to calculate the corresponding height from the original proportions. If you need a square from a rectangle, use the cropper rather than stretching the subject.
Resize with centimetres or inches
A physical size needs a print density. The calculation is pixels = centimetres ÷ 2.54 × DPI, or inches × DPI. For example, 3×4 cm at 300 DPI rounds to 354×472 pixels. This resizer writes your selected density into the JPG's JFIF metadata.
A print program can still override that metadata. Check its page scaling and do a suitable test print when exact physical dimensions matter. See the photo dimensions guide for worked examples and the difference between ratio and print size.
Use a file-size cap only when you need one
The optional output-size limit combines your chosen dimensions with JPG compression. The tool will not secretly change those specified dimensions to fit the cap. If the requested combination cannot be reached, it asks you to change the settings.
All resized outputs are JPGs. Transparent input areas use the chosen background colour. Enlarging an image adds pixels, not new captured detail; inspect the result rather than expecting a blurry original to become sharp.
Questions, answered
Does increasing DPI alone improve image detail?
No. DPI relates pixel count to physical print size. It does not recover detail that was absent from the source image.
Why does the other dimension change?
Keep aspect ratio calculates the other side from the original proportions. Turn it off only when you intentionally want a different ratio, which can stretch the content.
Will the output keep transparency?
No. This version exports JPG. Transparent areas are flattened against the selected background colour.