Resize Image
Change an image's width and height in pixels. The aspect ratio is locked by default so nothing gets stretched.
- Select a JPG, PNG, or WebP image. Its current dimensions appear immediately.
- Type a new width — the height updates automatically to keep the proportions. Uncheck Keep aspect ratio if you need exact dimensions in both directions.
- Click Resize Image and the resized file downloads automatically.
Resizing versus compressing
These solve different problems and are often confused. Resizing changes how many pixels the image contains. Compressing keeps the pixel count and stores those pixels less precisely. When a file is too large, resizing is almost always the better first move: a photo shrunk from 4000 to 1200 pixels wide contains roughly a tenth as many pixels, so the file collapses in size while still looking perfectly sharp at any normal viewing size.
The best results come from doing both, in order: resize to the dimensions you actually need, then compress to fine-tune the final file size. Compressing a needlessly huge image is what produces those blocky, smeared results people associate with compression.
Dimensions worth knowing
| Use | Typical width | Note |
|---|---|---|
| Website hero or full-width image | 1920 px | Plenty for almost every screen |
| Blog or article image | 1200 px | The safe general-purpose default |
| Email attachment | 1000–1200 px | Keeps the message small enough to send |
| Thumbnail or avatar | 200–400 px | Usually square, so uncheck aspect ratio |
| Printing at 4×6 inches | 1200–1800 px | Print needs far more pixels than screens |
The aspect ratio checkbox
Leave it ticked and typing either dimension recalculates the other, so proportions are preserved and nothing looks stretched. Untick it when you need an exact size in both directions — a 400×400 square avatar from a rectangular photo, say — but be aware the image will be distorted rather than cropped, since this tool scales rather than crops. For a square that isn't squashed, crop to square in your phone's photo editor first, then resize here.
Format and quality
PNG files stay PNG so transparency survives; JPG and WebP files come out as JPG at 92% quality, which is visually indistinguishable while keeping the file compact. Resizing is done with your browser's high-quality smoothing, and the output filename records the new dimensions — photo-1200x800.jpg — so you don't lose track of which version is which. Your original is never modified.