Free Online Tool
Image Resizer
Choose an image file and enter the target width and height to render a resized copy.
Preview
Processing Result
The result will appear here.
Selected images are not uploaded to a server and are processed only in your browser.
Useful Cases
- Resize profile images or thumbnails
- Fit upload size requirements
- Reduce the long side while keeping the original ratio
Size Settings
Keeping the aspect ratio prevents distortion. Set width and height manually only when you need an exact banner or layout size.
How to Use
- Select a JPG, PNG, or WebP image.
- Check the original dimensions and enter the target width and height.
- Use the keep aspect ratio option if needed.
- Preview the result and download the resized image.
Examples
- Resize a profile image to 800×800
- Reduce a blog image to 1200px wide
How Much Do Pixels Decrease?
File size depends on image content and output format, but total pixels can be calculated exactly from width and height.
| Dimensions | Total pixels |
|---|---|
| 4000 x 3000 | 12,000,000 pixels |
| 2000 x 1500 | 3,000,000 pixels (one quarter) |
| 1200 x 900 | 1,080,000 pixels (9% of the original) |
Halving both width and height reduces total pixels to one quarter. Enlarging a small image does not create missing detail.
To keep the same dimensions and reduce only file size, use the Image Compressor.
Calculation and Conversion Notes
Image resizing draws the source image to a browser canvas and renders it again at the specified width and height. Selected images are not uploaded to a server and are processed only in your browser. Image format support can vary by browser.
Resize vs Compression
Resizing changes pixel dimensions. Compression changes storage quality or format. For large photos, resize first and then compress if needed.
Notes
Enlarging a small image does not restore detail. Use a high-resolution original when you need a larger output.
FAQ
Why keep the aspect ratio?
Keeping the original ratio prevents the image from being stretched or squeezed.
Does enlarging make an image sharper?
No. Enlarging adds pixels but does not restore missing detail.
Should I resize or compress first?
For large photos, resize to the needed dimensions first, then compress if needed.
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