Image Resizer

The Image Resizer changes the width and height of a picture in pixels, for example from 4000 x 3000 pixels down to 1200 x 900 pixels. It is useful for shrinking large photos for a website, preparing images for social media, and making files smaller and faster to share.

What Is the Image Resizer?

The Image Resizer takes an image file and produces a new version at the dimensions you choose. You can set an exact width and height, set a width and keep the original proportions, or scale by a percentage. Resizing happens in your browser, and you download the resized image when you are done.

How to Use the Image Resizer

1. Click Choose Image or drop an image file into the upload area.
2. Enter the new width and height in pixels, or set one dimension and keep the aspect-ratio lock on.
3. Choose the output format if offered, for example keep JPEG or PNG.
4. Click Resize or Process to create the resized image.
5. Preview the result and check that it is not stretched or blurry.
6. Click Download to save the resized image.

Worked Example

Example: a photo is 4000 pixels wide and 3000 pixels tall. You set the width to 1200 pixels and keep the aspect ratio locked. The height becomes 3000 x (1200 / 4000) = 900 pixels, so the result is 1200 x 900 pixels. The image keeps its original 4:3 proportions instead of being stretched.

Limitations

• Enlarging an image beyond its original size usually makes it blurry, because no new detail is created.
• Reducing dimensions loses detail; you cannot fully restore the original quality from the smaller file.
• Results depend on the input format and quality; heavily compressed inputs may show artefacts after resizing.
• Very large images may be slow or fail on low-memory devices.

Frequently Asked Questions

Will resizing keep the aspect ratio?

Yes, if the aspect-ratio lock is on. If you set width and height independently, the image can be stretched, so keep the lock on unless you need a specific exact size.

What size should I use for a website?

Use the display size of the image on the page, often 800 to 1600 pixels wide for content images. Larger sizes increase file size without visible benefit.

Does resizing reduce file size?

Usually yes. Fewer pixels generally mean a smaller file, especially when combined with JPEG compression.

Can I resize to an exact size such as 1080 x 1080?

Yes, but if the original is not square, an exact square will crop or stretch the image unless you crop it first.