Increase image resolution

Increase the resolution of an image: make it 2x or 4x bigger in pixels, with Fast mode or AI mode on supported devices. Free, private, no upload.

Before you start

Resolution usually means the number of pixels in a picture, its width and height. This tool raises it: a 600 × 400 picture at 2× becomes 1200 × 800. More pixels let you print bigger or fill a bigger screen. They do not add detail the camera missed.

Choose Fast for a clean, sharp enlargement, or AI where your device offers it, for cleaner edges on small or blocky pictures. Both run on your device, and the result can be saved as a JPG or a PNG.

Tips

Decide the pixels you need first. A screen wants a width in pixels, and a print wants about 300 pixels for every inch, so a 5 × 7 inch print needs 1500 × 2100.

Enlarge once, to the size you need. Enlarging a picture, saving it and enlarging it again adds the marks of each round.

A blurry photo stays blurry when it is bigger. Enlarging fixes size, not focus or shake.

Screens in pixels: how much bigger you need

To fill a screen, a picture needs the screen's width in pixels. Common widths are 1280 (HD), 1920 (Full HD) and 3840 (4K). A picture that is 960 pixels wide needs 2× to fill a Full HD screen and 4× to fill a 4K screen. A picture that is 1920 pixels wide needs 2× for 4K.

So the sum is: the width you need, divided by the width you have. If the answer is 2 or less, choose 2×. If it is between 2 and 4, choose 4×.

Questions and answers

Is resolution the same as DPI?

No. Pixels are how many dots the picture has. DPI is only a label that says how big those dots print: 1200 × 1800 pixels is a 4 × 6 inch print at 300 DPI, and 12 × 18 inches at 100 DPI. Changing the DPI number adds no detail. This tool changes the pixels and does not write a DPI into the file.

Can I get 300 DPI from a small image?

You can get enough pixels for it. A 4 × 6 inch print at 300 DPI needs 1200 × 1800 pixels, so a 600 × 900 photo needs 2×. The print will be as detailed as the original, not more.

Is there a limit?

Yes: 16,777,216 pixels (4096 × 4096) on every device, and 4× is the most in one go. A photo that is already that big is left as it is.