How to use it
- Choose your photo or drop it into the box.
- Keep 3840 × 2160, or type another width and height.
- Pick how the picture should fit, then download the result.
Why 3840×2160?
3840×2160 is a popular size for 4K wallpapers and video thumbnails. Uploading the exact size avoids blurry automatic scaling and unexpected cropping by the website.
Choosing a fit mode: "Crop to fill" keeps the frame full and trims the edges, which is best for photos. "Fit inside" keeps everything visible, which is best for logos and screenshots. "Stretch" forces the shape and can distort faces, so use it only when you must.
Quality note: shrinking a picture keeps it sharp, but enlarging a small picture cannot add detail, so very small originals will look soft at large sizes.
Size facts for 3840×2160: the ratio is 16:9 (landscape (wider than tall)), the image has about 8.29 megapixels, and printed at 300 dpi it measures roughly 12.8 × 7.2 inches.
A typical 12 megapixel phone photo has about 1 times more pixels than 3840×2160, so resizing down is safe and keeps the picture sharp. Photos smaller than 3840×2160 will look soft if enlarged.
Best workflow: first crop or choose the fit mode, then resize to 3840×2160, and only compress afterwards if a file size limit applies. Doing it in this order keeps the quality highest. Your photo never leaves your browser.
Questions
How do I resize an image to 3840×2160 pixels?
Choose your picture, check that the size boxes show 3840 and 2160, and press the picture button. Then download the resized file.
What happens if my photo is not the same shape?
Pick a fit mode. "Crop to fill" cuts the extra edges, "Fit inside" keeps the whole picture and adds white bars, and "Stretch" changes the shape of the picture.
Is my image uploaded?
No. Resizing happens in your browser and nothing is sent to a server.
Can I use other dimensions?
Yes. Type any width and height in the boxes, up to 8000 pixels.
What is the aspect ratio of 3840×2160?
3840×2160 is 16:9, a landscape (wider than tall) shape. If your photo has a different ratio, "Crop to fill" trims the edges and "Fit inside" adds bars so nothing is cut.
How big will the 3840×2160 file be?
A typical JPG at 3840×2160 is roughly 972 to 4050 KB depending on detail. If a site needs a smaller file, resize here first and then use the <a href="/compress-image/">compress tool</a>.