Resize
Resize an image to 3840 x 2160
Drop a picture in and get it back at exactly 3840 by 2160 pixels - 4K UHD, a 16:9 shape.
Wallpaper for a 4K monitor or television, a background that stays sharp on a high-density screen, source material you do not want to re-do later. Because your photograph almost certainly has different proportions, the page asks what should happen to the difference rather than deciding for you: crop the overflow, fit the whole picture inside, or force both numbers and accept the distortion.
How to resize an image to 3840 x 2160
- Drop in your image, or several at once.
- Choose crop to fill, fit inside, or stretch.
- Let it resize. The result reports the dimensions it actually produced.
- Download. Your image was not uploaded to produce it.
Supported formats
This tool accepts JPG, PNG, WebP, GIF, BMP and AVIF files. Everything is decoded by your own browser, so the formats available depend on what your browser can open - which for HEIC in particular varies between Safari and other browsers.
Frequently asked questions
What happens if my image is not 16:9?
Whatever you choose. Crop to fill scales until the 3840 x 2160 box is covered and trims what hangs over, so you get the exact size with the edges gone. Fit inside scales the whole picture until it fits, so nothing is lost and one side comes out shorter than the box. Stretch forces both numbers and changes the shape of everything in the picture. The default is crop to fill, because an exact size is usually the reason somebody came.
Will enlarging a smaller photo to 4K make it look better?
No. Enlarging invents pixels by interpolating between the ones you have; it cannot recover detail that was never captured. A 1920 x 1080 photograph scaled to 4K contains exactly as much real detail as it did before, spread over four times the area, and often looks slightly softer. It is worth doing when a system demands those dimensions, and not worth doing in the hope of a sharper picture.
Will a small photo be enlarged to 3840 x 2160?
It will, and it is usually the wrong thing to ask for. 4K is eight megapixels - more than many phone photographs and most screenshots - so enlarging is common here and always invents pixels rather than recovering detail. If a system demands the dimensions, take them; if you were hoping for a sharper picture, this will not produce one.
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