Large images have their place, but a website does not need to send every original file to its visitors. This guide helps you organize image preparation. You still need to inspect the results and measure them on your actual website.
Start with where the image will appear
Consider whether the image belongs in a small card, a banner, or a full-image view. The right dimensions depend on screen width and pixel density. Keep the original separately and create web versions from it. Avoid repeatedly resizing a file that has already been compressed many times.
Choose dimensions before compression quality
Reduce the width and height to suit the space where the image will be used, while keeping its aspect ratio. Enlarging a small image does not restore original detail. That is why this site’s Image Resizer reduces dimensions without making an image larger than its original size.
Check transparency and text inside the image
Photos, logos, and screenshots contain different kinds of detail. After converting a file, inspect text edges, thin lines, transparent backgrounds, and colors. The format that makes the smallest file may not suit every image. Always judge the file size alongside the actual result.
Test the image on the page that uses it
Open the page on both mobile and desktop. Check that the image is not too blurry and that content does not jump as it loads. Images below the first part of a page can be loaded as they approach the visible area, while the main image should be available for the browser to load immediately.
Image Resizer runs in your browser; your image is not sent to a server for processing. Download the result and compare it with the original before putting it on your website.