Change Image Opacity Online
Opacity controls how visible an image is, from fully transparent at 0% to fully visible at 100%. PNG output preserves the selected transparency.
Example
Setting a logo to 40% opacity can turn it into a subtle background watermark while keeping the original image dimensions.
Factors That Affect the Result
Lower opacity reveals more of whatever background is placed behind the exported PNG. JPG should not be used when transparency must be preserved because it has no alpha channel.
Frequently Asked Questions
What does 50% opacity mean?
The image is rendered half transparent.
Does opacity resize the image?
No. Dimensions remain unchanged.
Is processing local?
Yes. The adjustment runs in your browser.
Related Tools
Adjusting Image Opacity
Opacity controls how transparent an image appears. Lower values allow the background beneath it to show through, which is useful for overlays, watermarks and layered designs. Check the final result against the actual background color, because the same opacity can look different on light and dark surfaces.
Adjusting Image Opacity
Opacity controls how transparent an image appears. A lower value lets more of the background show through, while full opacity keeps the image completely visible. When creating overlays, logos, or watermarks, test the result against the actual background because the same opacity can look very different on light and dark surfaces.
Technical Method and Practical Limits
Opacity controls how strongly image pixels contribute when composited over a background. Reducing opacity does not erase the underlying pixels; exported transparency also depends on choosing a format such as PNG that supports an alpha channel.