Resize Image
Change dimensions by size, percentage or to fit a box.
Everything runs inside your browser. Your files never leave your device.
Drop your files here
.jpg, .jpeg, .png, .webp, .gif, .bmp, .avif · they stay on this device
Ask about Resize Image
Questions about what this tool does, which option to pick, or what it can and cannot handle.
The question you type here is sent to an AI provider to be answered — your files and whatever you put in the tool above are not, and the assistant cannot see them. Answers are generated and can be wrong. The tool itself is not guessing: it runs deterministic code on your device.
About the Resize Image
Resizing sounds like one operation and is really three, which is why so many resized images come out wrong. Fitting an image inside a box keeps its proportions and leaves space; filling the box keeps proportions and crops the overflow; stretching to exact dimensions keeps everything and distorts it. This tool asks which one you want rather than choosing for you.
Fit is the right answer nearly always. It guarantees the whole picture survives and nothing is squashed. Fill is what you want for a thumbnail grid or a cover image, where every tile must be the same shape and losing the edges matters less than consistency. Stretching to exact dimensions is almost never what anyone means, and the visible result is a face that is subtly too wide.
Downscaling is where quality is won or lost. Reducing an image to less than half its size in one step produces aliasing — the jagged edges and shimmering detail that make a resized photograph look cheap — because the resampler is skipping pixels rather than averaging them. This uses the browser's high-quality resampling path, which handles the common cases properly.
Upscaling deserves a warning rather than a setting. Enlarging an image cannot add detail that was never captured; it can only interpolate between the pixels that exist, which produces softness. A 400-pixel image blown up to 1600 will look like a 400-pixel image blown up. If the result matters, find a larger original.
The dimensions of the result are reported alongside the file size, so you can confirm the aspect ratio survived and see what the resize cost or saved in bytes.
How to use it
- 1Drop in the images. A batch is processed one after another with the same settings.
- 2Choose how to resize: fit inside a box, fill it and crop the excess, or force exact dimensions.
- 3Enter the target size. Fit and fill need a box; percentage scaling needs only a figure.
- 4Download the results, and check the reported dimensions if the aspect ratio matters.
Questions
- Which resize mode should I use?
- Fit, unless you have a specific reason not to. It keeps the whole image and its proportions. Fill is for thumbnail grids where uniform shape matters more than the edges. Exact dimensions distorts the picture and is rarely what anyone actually wants.
- Why does my enlarged image look soft?
- Because enlarging cannot invent detail. It interpolates between existing pixels, which is inherently blurry. No tool can recover information that was never in the file — the answer is a larger original.
- Are my photographs uploaded?
- No. Decoding, resizing and re-encoding all happen on a canvas inside this browser tab. Nothing is transmitted, which is why the page works offline and why family photographs are safe to run through it.
- Does resizing reduce the file size?
- Substantially, since there are fewer pixels to store. Halving both dimensions quarters the pixel count. If size is the actual goal rather than dimensions, the compression tool gets there with less loss of detail.