Image
Image Resizer
Scale images to any dimensions with optional aspect-ratio lock, processed entirely in your browser.
Drop an image here, or click to choose
Supports JPG, PNG, WebP, GIF, AVIF, SVG
What is Image Resizer?
Serving a 4000-pixel image into an 800-pixel display slot is pure waste: the visitor downloads all that data and the browser then throws most of it away. Reducing an image's actual dimensions before publishing is the single most effective way to cut its weight, usually beating any compression trick.
This tool uses Canvas with high-quality interpolation, so downscaled images stay smooth rather than jagged. Aspect-ratio lock is on by default to prevent distortion — change one dimension and the other follows the original proportions.
How to use
- Drop an image onto the box, or click to choose a file.
- Enter your target width or height. With ratio lock on, the other dimension adjusts itself.
- Or click 25%, 50% or 75% to scale relative to the original.
- Check the preview, then click Download. The filename includes the new dimensions.
Frequently asked questions
Does enlarging an image make it sharper?
No. Enlarging only stretches existing pixels; it invents no new detail. The result looks soft or blocky. Genuine upscaling requires AI-based tools that infer detail.
What width should web images be?
In-article images are usually fine at 800 to 1200 pixels. Full-width hero backgrounds want 1920. Avatars and icons need only 200 to 400. Anything wider than the slot it displays in is wasted bandwidth.
What format does the resized image come out in?
The tool preserves the original format: PNG stays PNG so transparency survives, and everything else exports as high-quality JPG. To change format, use the image converter.