Image Resizer — Resize Images by Pixel Dimensions

About Image Resizer — Resize Images by Pixel Dimensions

Image Resizer resizes JPEG, PNG, WebP, and GIF images to any custom width and height, with options to maintain aspect ratio. Works entirely in your browser — no upload required, instant download.

FAQ

Will resizing reduce image quality?

Enlarging an image beyond its original size can reduce quality. Reducing size generally maintains quality. Use the JPEG quality setting to balance file size and clarity.

Does resizing change the file format?

By default the output format matches the input. You can change the output format using the format selection option.

What is the maximum file size supported?

Images under 20MB work best in most browsers. Very large files may be slow due to browser memory limits.

What is the difference between resampling and resizing?

Resizing changes the display dimensions or metadata without changing the actual pixel data (used in HTML width/height attributes or CSS). Resampling changes the actual pixel data by adding or removing pixels. When you resize an image smaller, resampling algorithms (bilinear, bicubic, Lanczos) decide how to combine removed pixels. Lanczos resampling produces the sharpest results for downscaling. This tool performs actual resampling when you change the pixel dimensions.

Will resizing an image affect its SEO?

Yes. Large images are a major cause of slow page load times, which directly impacts Core Web Vitals (LCP — Largest Contentful Paint) and search rankings. Google recommends serving images at the size they are displayed — a 1200px wide image displayed in a 400px container wastes bandwidth. Resize images to their display dimensions, serve WebP format, and use responsive images (srcset) to serve different sizes for different screen widths. Google PageSpeed Insights flags oversized images as a specific opportunity.