1600 × 900 to 800 wide
Height becomes 900 × 800 ÷ 1600 = 450.
Image Resizer
Resize images to exact pixel dimensions or by percentage, keeping the proportions if you like.
Drag an image here, or choose one
JPG, PNG, WebP or GIF. It stays on your device — nothing is uploaded.
Runs in your browser — nothing you enter is sent to a server.
How the Image Resizer works
Choose an image and enter a new width or height in pixels — with Keep proportions on, the other side is calculated so nothing looks stretched. Or pick a percentage. The image is redrawn at the new size with high-quality smoothing in your browser and keeps its format (GIFs become PNG).
Enlarging can't add detail that isn't there, so images scaled above 100% look softer. For the web, resize down to the size the image is actually shown at.
Formula
new height = height × new width ÷ width
Examples
Half size
50% of 1600 × 900 is 800 × 450.
Frequently asked questions
What's the largest size I can make?
About 16.7 million pixels (4096 × 4096), the limit of browsers on phones. The tool tells you if a size is too large.
Does resizing reduce the file size?
Usually a lot when you make it smaller. For the smallest files, also use the Image Compressor.
Why does my image look stretched?
Keep proportions was off and the new width and height have a different ratio. Turn it back on to fix one side automatically.
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