How to resize an image to 3840x2160
- Choose or drop your images above.
- Keep “Crop to fill” for an exact 3840x2160 result, or pick “Fit inside” to avoid cropping.
- Download the resized files individually or as a ZIP.
About 3840x2160 pixels
A 3840x2160 image is landscape, with an aspect ratio of 16:9, and holds 8.29 megapixels. At 300 DPI it would print at about 12.8 x 7.2 inches (32.5 x 18.3 cm). As a JPEG it usually lands between 911KB and 1.8MB, depending on the picture and the quality you choose.
Where 3840x2160 is used
Ultra HD, often called 4K. It is the standard size for 4K monitors, TVs and video, with four times the pixels of Full HD.
- Landscape photos need the least cropping for wide formats.
- Large screen sizes make big files, so compress the result for websites and slides.
- Match the shape of the screen. A different shape either crops the picture or leaves bars.
Crop to fill or fit inside?
Crop to fill always gives exactly 3840x2160 by trimming the edges that do not match the shape. Fit inside keeps the whole picture and scales it so neither side exceeds 3840x2160, which can leave one side shorter. For a typical 4:3 phone photo, crop to fill removes about 25% of the picture. A 3:2 camera photo loses about 16%, a 16:9 screenshot about 0%, and a square image about 44%.
Quality and format
Check the result before you upload
Open the finished file and check three things: the picture measures 3840x2160, the subject is not cut off, and the file is small enough for where you upload it. If a platform sets a size limit, run the result through the online compression tool or choose a limit such as 200KB.
A tip for this size
Files this large are heavy. Compress them if they are for the web. Need another size? Try 2560x1440, 1920x1080, 1600x900, the general image resizer, or browse every size preset.
Frequently asked questions
Why is my image not exactly 3840x2160?
You are probably using Fit inside, which never crops. Switch to Crop to fill for exact dimensions.
How big will a 3840x2160 file be?
As a JPEG, usually between 911KB and 1.8MB. Photos with lots of fine detail come out larger, and simple graphics smaller. Lower the quality for a smaller file.
Is 3840x2160 the right size for 4K screens and video?
It is a widely used size for 4K screens and video, but platforms and agencies change their rules. Check the current guidelines before you upload.
Will a small photo look blurry at 3840x2160?
If the original is smaller than this size, the tool has to enlarge it, and the result can look soft. Start from the largest version you have.