A modern phone photo is around 4000 pixels wide, while a website, email or marketplace listing rarely shows more than 1200 to 2000. Resizing brings the pixel count down to what the image will actually be shown at, and cuts the file size along with it.
Will resizing reduce quality?
Making an image smaller keeps it sharp. You lose pixels you would never have seen on screen, and the image is resampled with a high-quality filter so edges stay clean. The file usually gets much smaller too.
Making an image larger is a different matter. Resizing cannot invent detail, so enlarging a small image gives you a bigger but softer picture. If you need a large print, start from the largest original you have.
How does the aspect ratio work?
Enter a maximum width and, if you like, a maximum height. The image is scaled to fit inside that box without being stretched or squashed. A 4000 by 3000 photo with a maximum of 1200 by 1200 comes out at 1200 by 900. Leave the height at 0 to set only the width; the default is 1600 pixels wide, a good size for websites.
Images that are already smaller than your box are left at their size, unless you tick the option to allow enlarging. That stops a folder of mixed photos from blowing small ones up into soft, oversized files. If you need an exact shape, such as a square profile picture, use Crop Image.
What sizes should I use?
For a full-width website image, 1600 to 2000 pixels wide is plenty. For email and blog images, 800 to 1200 pixels. For a social media post, check the platform's recommended size; square posts are often shown at 1080 by 1080. For a thumbnail, 300 to 400 pixels.
Which formats work?
JPG, PNG, WebP, GIF, BMP, TIFF and ICO. The output keeps the input format. To change format as well, use Convert Image, or chain both steps in the pipeline builder, which resizes a whole folder in one run. You can try a pipeline on up to 3 files for free; larger runs need Pro or credits and are processed on our server.
Does the file leave my computer?
On this page, resizing happens in your browser. The images are never uploaded, so the files never leave your device. Free, no account, no daily cap, up to 50 MB per image.
How to resize an image
- Drop your image onto the drop zone.
- Enter the maximum width, and a height if you need one.
- Click Resize.
- Download the resized image.
FAQ
Can I resize by percentage?
Work out the pixel size instead: half of 4000 pixels is 2000. Enter that as the width.
Will EXIF data be kept?
Resizing re-encodes the image, and metadata may not be carried over. Keep the original if you need the date taken or location.
Can I resize a photo to a specific file size, like under 200 KB?
Resize first, then use Compress Image and lower the quality until the size fits.
Why did my small image not get bigger?
Enlarging is off by default, because it adds size without detail. Tick allow enlarging if you really need it.