Image Resizer
Resize images to an exact size, a width or height, or a percentage.
- Runs in your browser
- Nothing is uploaded
- Free, no sign-up
Images are resized by your own browser and are never uploaded. Photos are turned the right way up using their camera orientation before resizing.
About this tool
Set a size in pixels, a width or height, or a percentage, and resize a whole batch at once. When you give both width and height you choose how the picture fills the shape: cropped to fill it, padded to sit inside it, or stretched. Everything runs in your browser.
How to use it
- Drop one or more images onto the page.
- Choose how to size them: exact size, width, height or percent, and pick a preset if you want a standard social-media size.
- Click Resize, then save images one at a time or all together as a zip.
Four ways to set the size
- Percent scales both sides by the same factor. Half size is 50%.
- Width sets the width and works out the height so the proportions are kept. This is the usual choice for web images.
- Height does the same from the other side.
- Exact size sets both. Because most photos do not have the shape you ask for, this is where you decide how the picture is fitted to the box.
Fitting a picture to a box
| Fit | What happens | Use it for |
|---|---|---|
| Fill and crop | Scales to cover the box and trims what overflows, from the centre | Share cards, thumbnails, banners: no empty space |
| Fit inside, pad the rest | Scales to fit entirely, then adds a border to reach the exact size | When nothing may be cut off, such as a logo |
| Fit inside, keep proportions | Scales to fit, with no padding, so one side may be smaller than asked | Limiting a maximum size |
| Stretch to size | Forces the exact size and distorts | Rarely: only when the distortion is intended |
A 3000 × 2000 landscape photo resized to a 1200 × 630 share card is best with Fill and crop, which takes a wide slice out of the middle. If an important part is at the edge, crop it yourself first with the image cropper.
Making smaller, and making larger
Shrinking an image loses no visible quality at the size it is shown. Enlarging cannot add detail that was never captured, so a small image stretched to a large one only looks soft. For that reason Allow enlarging is off by default, and a size bigger than the original is held at the original.
A browser can build an image of up to about 16,000 pixels on a side. Anything beyond that is reported instead of failing quietly.
Size in pixels, size in bytes
Resizing changes the number of pixels, and the file size follows from that and from the format. Halving both sides leaves a quarter of the pixels, so a much smaller file. To shrink the file further without changing dimensions, use the image compressor, or save as WebP, which is usually smaller than JPEG at the same quality.
Images are redrawn when they are resized, so the saved file does not carry the original's metadata, such as the camera model or GPS location. That is a useful side effect before sharing photos.
Frequently asked questions
Does resizing reduce image quality?
Making an image smaller keeps it sharp at its new size. The quality setting only matters for JPEG and WebP, which are lossy; PNG is not affected.
Which format should I save as?
Same as original keeps things simple. Choose JPEG for photographs, PNG where you need transparency or crisp graphics, and WebP for the smallest files if your audience's browsers support it, which all current ones do.
Why do my phone photos not come out sideways?
Photos carry a camera-orientation tag, and the tool applies it before resizing, so they come out the way they appeared in your gallery.
Are my images uploaded?
No. They are decoded, resized and saved by your browser, and none of it is sent to a server.
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