Resize image for 4K wallpaper

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Resize to 3840 × 2160 px in one step. That is a landscape (wide) 16:9 shape with 8,294,400 pixels in all, which counts as a large image next to a modern camera photo.

This is a standard screen resolution (4K UHD), so the image fills a display of that size exactly with no scaling.

Output size	3840 × 2160 px
Aspect ratio	16:9 (landscape)
Standard name	4K UHD
Total pixels	8,294,400 (8.29 MP)
Prints at 300 DPI	12.8 × 7.2 in (32.5 × 18.3 cm)

Fitting a photo into 3840 × 2160 px

Resizing to a fixed width and height only gives a clean result when the photo has the same shape as the target. A shape mismatch has two outcomes: the picture is stretched, or part of it is cropped. Crop first, then resize, so you decide what is cut. This is how much of each common photo would be lost to fill 16:9:

Starting photo	Cropped away to fill the shape
Phone photo (4000 × 3000, 4:3)	About 25% of the image
DSLR photo (6000 × 4000, 3:2)	About 16% of the image
Video frame (1920 × 1080, 16:9)	Nothing: same shape
Portrait phone photo (3000 × 4000, 3:4)	About 58% of the image

Size, quality and file weight

8,294,400 pixels saved as a JPG at web quality typically weigh about 810 KB to 2.37 MB, depending on how much detail the picture contains. Flat graphics and screenshots saved as PNG compress very well when colors are simple, and poorly when they contain photographic gradients.

This is a large image. If you only need it for the web, consider a smaller size or WebP/AVIF to keep the file lightweight.

How large can it be printed?

These figures follow from the pixel count: print size = pixels ÷ DPI. Going above the 300 DPI row gives no visible benefit; going below it looks softer.

Quality	DPI	Print size
Screen-resolution draft	72	53.3 × 30 in (135.5 × 76.2 cm)
Acceptable for posters	150	25.6 × 14.4 in (65 × 36.6 cm)
Photo quality	300	12.8 × 7.2 in (32.5 × 18.3 cm)

How to resize an image for 4K wallpaper

Add your image. Select a photo or drag it onto the box above. JPG, PNG, WebP, AVIF, HEIC and BMP files are accepted, and the file stays on your device.
Crop to 16:9 (recommended). The output is 3840 × 2160 px, a 16:9 shape. Cropping to that shape first with the built-in Crop tool decides what stays in frame and avoids distortion.
Confirm the size and format. The preset fills in 3840 × 2160 px. Choose JPG for photos or PNG for graphics with sharp edges or transparency.
Download the resized image. Click resize and save the file. The result uses Lanczos-3 resampling, which keeps edges clean when scaling down.

Related presets

Other presets with the same output size

Nearby sizes in this category

More 16:9 presets

More in this category: Device & Screen Resolution Sizes. For several photos at once, use the bulk image resizer.

Frequently asked questions

How do I resize an image for 4K wallpaper without stretching it?▼

Crop the photo to 16:9 first (the built-in Crop tool does this), then apply the preset. If you skip the crop and your photo has a different shape, the result is either stretched or cut off. For example, a 4:3 phone photo needs about 25% of its area cropped to become 16:9.

What aspect ratio is 3840 × 2160?▼

16:9, landscape. It has 8.29 megapixels and is also known as 4K UHD. The width is 1.78 times the height.

How big will a 3840 × 2160 file be?▼

As a JPG at web quality, usually between 810 KB and 2.37 MB; photographic PNGs are several times larger. To fit a specific limit, use one of the file-size presets after resizing, or set a target size in the editor.

What if my photo is smaller than 3840 × 2160?▼

The tool will enlarge it, but enlarging cannot add detail, so the result looks soft. Starting from a photo at least as large as 3840 × 2160 gives a much sharper result.

Which format should I use for 3840 × 2160?▼

JPG or WebP for photographs; PNG for graphics, screenshots and anything with transparency. AVIF can be smaller still, but it encodes more slowly and some older apps cannot open it.

How large can I print a 3840 × 2160 px image?▼

About 12.8 × 7.2 in (32.5 × 18.3 cm) at 300 DPI (photo quality) and 25.6 × 14.4 in (65 × 36.6 cm) at 150 DPI (acceptable for posters viewed from a distance).

Do I need an account, and does it add a watermark?▼

No account and no watermark. Open the page, add your photo, and download the result. Because processing happens on your own device, there is no queue and nothing to wait for, even with a large original.

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