Image Resizer

Image Resizer changes the pixel dimensions of an image and gives you precise control over how the source fits the target box using contain, cover, fill, or stretch behavior. Resizing is essential for fitting platform requirements — social avatars, thumbnails, banner dimensions — and for shrinking oversized photos so pages load faster. The work runs entirely in your browser, so your images are never uploaded.

The four fit modes control aspect-ratio handling. Contain scales the whole image to fit inside the target box while preserving its proportions, which may leave empty padding. Cover scales to completely fill the box, preserving proportions but cropping any overflow. Fill and stretch resize to the exact target dimensions ignoring the original aspect ratio, which can distort the image — useful only when you genuinely need exact dimensions regardless of proportion. Internally the tool draws the decoded image onto a canvas of the requested size using the chosen scaling rule, then encodes the result.

Use it to generate consistent thumbnail sets, meet exact dimension rules for ad networks or app store screenshots, or downscale camera photos before publishing. It pairs naturally with the Image Cropper when you want to choose exactly which region survives, and the Image Compressor to squeeze the resized output further. Downscaling almost always looks great; upscaling cannot invent detail and will appear soft or blocky.

Practical tips: pick cover for fixed-size thumbnails where filling the frame matters more than showing the whole image, and contain when nothing can be cropped away. Avoid fill and stretch unless distortion is acceptable, since they warp faces and shapes. Resize down to the largest size you will actually display rather than serving full-resolution originals, and remember that resizing before compressing produces the smallest final file.