Image Resizer
Resize images by pixels with aspect ratio lock. Export as JPEG, PNG, or WebP.
Examples
| Input | Result |
|---|---|
| A 4000x3000 photo resized to 1200px wide | 1200x900 image (aspect ratio preserved) |
| A 800x600 banner scaled up by 150% | 1200x900 image |
| A 1920x1080 screenshot resized to 640x480 (custom dimensions) | 640x480 image with new aspect ratio |
| A 3024x4032 phone photo resized to 50% | 1512x2016 image |
About this tool
This tool uses the HTML Canvas API to resize images right in your browser. You can set exact pixel dimensions or scale by a percentage. When you lock the aspect ratio, changing one dimension automatically adjusts the other so the image does not get stretched or squished.
The Canvas API handles the pixel interpolation natively, which means results are fast and consistent across modern browsers. Once resized, you can download the new image as PNG, JPEG, or WebP. No data is sent to any server during the process.
Frequently asked questions
Does resizing reduce image file size?
Yes. Smaller pixel dimensions mean fewer pixels to store, so the resulting file will be smaller. The exact savings depend on the output format and quality setting.
Will resizing make my image blurry?
Scaling down generally looks fine because you are discarding pixels. Scaling up can introduce blur or artifacts since the browser has to interpolate new pixel data that did not exist in the original.
Is the original image uploaded to a server?
No. The resizing happens entirely in your browser using the Canvas API. Your image never leaves your device.