What is an Image Resizer?
An image resizer changes the pixel dimensions of a picture — for example scaling a 4000×3000 photo down to 1200×900 for a website hero or a marketplace listing.
Resizing happens on a canvas inside your browser with high-quality scaling. Nothing is uploaded, and the aspect-ratio lock prevents accidentally stretched images.
Common targets worth knowing: 1200x630 for social link previews, 1920px wide for full-width website heroes, 800px for blog inline images, 400px for thumbnails. Serving an image at the size it is actually displayed is one of the biggest and easiest page-speed wins — browsers download every pixel you ship, not every pixel they show.
How to use the Image Resizer
- Drop an image onto the tool.
- Enter the target width or height — the other side follows automatically while the ratio is locked.
- Press Resize, then download the result.
Supported formats
- JPG / JPEG
- PNG
- WebP
Frequently asked questions
What size should product photos be?
Most marketplaces want 1000-2000px on the long side. Amazon asks for at least 1000px for zoom; keep the original safe and resize copies down.
Does resizing reduce file size too?
Dramatically — halving both dimensions cuts pixel count to a quarter. For the smallest result, resize to display size here, then run the output through the Image Compressor.
Will resizing distort my image?
Not with the aspect-ratio lock on (the default). Unlock it only when you deliberately want an exact width and height.
Can I enlarge an image?
Yes, but upscaling cannot invent detail — a small image enlarged a lot will look soft.
Is the image uploaded anywhere?
No — resizing runs entirely in your browser.
What format is the output?
The same format as the input, so a PNG stays PNG and a JPG stays JPG.