Resize JPG

Resizing a JPG down (reducing pixel dimensions) generally improves perceived quality because pixels become more densely packed. However, because JPG is lossy, the resizing and re-encoding process introduces a small amount of additional compression. To minimize quality loss, resize from the highest-quality original available and use quality 90+ when saving the resized JPG. Resizing up always degrades quality because the software must interpolate new pixels that did not exist in the original.

For web use, match the image display dimensions exactly: if an image displays at 800 pixels wide on your site, resize to 800 pixels wide. For print, use 300 DPI: a 4x6 inch print needs 1200x1800 pixels. For email and sharing, 1200-2000 pixels on the long side is usually sufficient. This tool lets you enter exact pixel dimensions and maintains aspect ratio by default to prevent distortion.

It depends on whether the pixel dimensions are larger than needed. If the image is 4000 pixels wide but will only display at 800 pixels, resizing down to 800 pixels will produce a much smaller file than compression alone. If the dimensions are already correct but the file is still too large, use compression. For best results, resize first to the correct dimensions, then apply compression if the file is still too large.

Yes, this tool maintains aspect ratio by default, meaning you only need to enter either width or height and the other dimension is calculated automatically to prevent stretching. If you need exact custom dimensions that change the aspect ratio (such as converting a landscape photo to square), use the Crop Image tool first to achieve the desired ratio, then resize to the final dimensions.