Resize to exact dimensions
Resize an image to 3840 × 2160
Resize images to exactly 3840×2160 pixels in your browser. Batch resizing, aspect ratio control, and nothing is uploaded.
Drop images here
or · drop a folder · paste from clipboard
3840×2160 is 4K UHD, for large displays and high-density wallpaper. Drop your images above and they are resized to fit those dimensions, using a high-quality resampling filter so edges and text stay clean rather than turning blocky.
By default the aspect ratio is preserved, so your image is scaled to fit inside 3840×2160 without stretching. If your source has a different shape, the result will match one dimension exactly and come in under the other. Turn off "keep aspect ratio" if you need the exact box regardless of distortion.
Resizing and compression happen in the same pass here, so you can drop the resolution to 3840×2160 and convert to WebP at the same time — which is usually what you actually want for a web page.
How to resize an image to 3840 × 2160
- Drop your images onto the box above.
- The size is preset to 3840×2160, so there is nothing to configure.
- Download the resized files individually or as a ZIP.
Frequently asked questions
Are my images uploaded to a server?
No. The conversion runs inside your browser using WebAssembly, so the image data never leaves your device. That also means there is no queue, no account, and no file size cap imposed by a server.
Will my image be stretched or cropped?
Neither, by default. The image is scaled proportionally to fit within 3840×2160. Because it preserves the aspect ratio, one dimension may end up smaller than the target if your source has a different shape. Unchecking "keep aspect ratio" forces the exact dimensions instead.
Can I enlarge a small image to this size?
The "never enlarge beyond the original" option is on by default, because scaling an image up adds no detail — it just makes it soft. Turn it off if you specifically need the larger canvas.
Can I convert several images at once?
Yes. Drop in as many files as you like — or a whole folder — and they are processed in parallel across your CPU cores. When they finish you can download them individually or grab everything as a single ZIP.