Change image dimensions — aspect ratio preserved automatically
Yes — if you only set the width, height is calculated automatically. If you set both, the image will be resized to exactly those dimensions (may distort).
JPG, PNG, WebP, and BMP. The output format matches the input.
Yes, images up to 20 MB are supported.
Yes. Files are sent over HTTPS and deleted within 1 hour.
Resizing an image means changing its dimensions — the width and height measured in pixels. This is different from compressing: resizing changes how big the image is, while compression changes how much space it takes up. You resize an image to fit a specific space: a profile picture that needs to be a certain size, a banner with exact dimensions, or a photo that's simply too large for where you want to use it.
Most images straight from a camera or phone are far larger than they need to be — often several thousand pixels wide. Resizing them down to the size you actually need makes them load faster and fit properly. ConvertDox lets you set exact dimensions or scale by percentage, with the option to keep the original proportions so the image doesn't look stretched. Files are processed securely and deleted within minutes, with no watermark.
Resize a photo to the exact dimensions a platform requires for avatars or profile images.
Fit images to the precise sizes each platform uses for posts, stories, and banners.
Scale images down to their display size so pages load faster and look crisp.
Resize a logo or photo to fit neatly within an email signature.
Adjust image dimensions to match the size you intend to print.
Create small, consistent thumbnail versions of larger images for galleries or listings.
Yes, completely free with no signup and no watermark added to your images.
Resizing changes the image dimensions (width and height in pixels). Compressing reduces the file size without necessarily changing dimensions. You can do both for the smallest, best-fitting image.
Resizing down preserves quality well. Enlarging a small image beyond its original size can make it look blurry, since there's no extra detail to add.
Yes. Keep the "maintain aspect ratio" option enabled and the image scales proportionally without stretching.
Yes. Your image is uploaded securely, resized, and automatically deleted from our servers within minutes. We never store or share your files.
Common image formats including JPG, PNG, and WebP are supported.