Resize Image to 3840×2160
Resize any image to 3840×2160 pixels — 4K UHD, 16:9. The size is already locked below: upload a high-resolution image and download it at 4K, ready for a desktop wallpaper or monitor. It runs in your browser, so nothing is uploaded.
What is 3840×2160 used for?
3840×2160 is 4K UHD — a 16:9 resolution with four times the pixels of Full HD (1920×1080).
It is used for 4K desktop and monitor wallpapers, 4K video, and any high-resolution display. One important caveat: resizing up from a smaller image cannot invent detail, so start from a large source for a sharp result. A 4K image also scales down cleanly to smaller screens, so it is a safe high-quality master size.
How to resize to 3840×2160
- Upload a large, high-resolution image (JPG, PNG, or WebP) — the target is already set to 3840×2160.
- If your image is not already 16:9, untick 'Keep the original shape' to fill the frame, or crop it first.
- Click Resize, then download your 3840×2160 image.
3840×2160 — FAQ
How do I resize an image to 3840×2160?
Upload your image on this page — the size is already set to 3840×2160. For the sharpest result start from a large, high-resolution image. Untick 'Keep the original shape' if your image is not 16:9 and you want it to fill the full frame, then click Resize and download.
What is 3840×2160 used for?
3840×2160 is 4K UHD at a 16:9 aspect ratio — four times the pixels of Full HD (1920×1080). It is used for 4K desktop and monitor wallpapers, 4K video, and high-resolution displays.
Can I upscale a small image to 4K?
You can resize a smaller image up to 3840×2160, but resizing cannot add detail that was not in the original — an upscaled small image will look soft or pixelated. For a crisp 4K result, always start from a large, high-resolution source image.
Is 3840×2160 the same as 4K or UHD?
For most consumer displays, yes. 4K UHD is 3840×2160. (True DCI 4K used in cinema is slightly wider at 4096×2160, but monitors, TVs, and wallpapers use 3840×2160.)
Is my image uploaded to a server?
No. This tool runs entirely inside your browser. Your image never leaves your device, so nothing is uploaded anywhere.
Other common sizes
Need a different size? Use the main resize image tool for any dimensions, or the compress tool to hit an exact file size after resizing.