Image Resizer
Change image dimensions to specific pixels or percentages instantly.
Loading Smart Logic...
Quick Tip
Select the image. Its current dimensions appear automatically.
About This Tool
Why use Image Resizer?
Change an image's pixel dimensions. The original width and height are read from the file and filled in for you, the aspect ratio is remembered, and the image is redrawn at the size you enter — so you can set one dimension and let the other follow rather than doing the arithmetic yourself.
Resizing is the single most effective thing you can do about a heavy page. A 4000-pixel-wide camera photo displayed in an 800-pixel column is carrying roughly 25 times more pixels than the screen will ever use, and no amount of compression fixes that — it is the wrong size, not the wrong quality. Set the width to what the layout actually needs, and the file usually drops by an order of magnitude on its own.
Key Benefits
Aspect ratio kept
The original proportions are read from the file, so images do not come out stretched or squashed.
Correct file extension
The download is named for what it actually is. Formats a browser canvas cannot write are saved as PNG rather than being mislabelled.
Processed locally
The image is decoded and redrawn in your browser, so nothing is uploaded to be resized.
How to use Image Resizer
- 1
Select the image. Its current dimensions appear automatically.
- 2
Enter the width or height you need; the aspect ratio is kept so the image does not distort.
- 3
Apply the resize and check the preview.
- 4
Download the result. PNG, JPEG and WebP keep their format; anything else is saved as PNG.
Best use cases
Cut a camera photo down to the width your site actually displays.
Meet an exact pixel requirement for a profile picture or a banner.
Prepare thumbnails from full-size images.
Reduce a screenshot before pasting it into documentation.
Image Resizer FAQs
Does resizing reduce quality?
Making an image smaller is fine — you are discarding pixels the display would not have used anyway. Making one larger cannot add detail that was never captured, so enlarging always looks soft.
How do I keep the proportions?
The original aspect ratio is read from the file when you select it, so setting one dimension gives you the matching value for the other without distortion.
What format will I get back?
PNG, JPEG and WebP keep their own format. Other inputs, such as GIF or SVG, are saved as PNG, because a browser canvas can only write those three.
Should I resize or compress to make a file smaller?
Resize first. An oversized image is carrying pixels nothing will display, and cutting the dimensions usually saves far more than compression does. Then compress what is left if you still need to.
Related File Tools
More free file tools that work well alongside image resizer.