Adjust Saturation
Boost or reduce the intensity of colours in an image, all the way from vivid to greyscale.
How it works
- 1
Drop your image onto the upload area and drag the slider to change colour intensity.
- 2
Drag all the way left to produce a greyscale result, or right to make colours more vivid.
- 3
Click Apply Saturation to download the adjusted image.
Questions
How is saturation calculated?
Each pixel is converted to the HSL colour model, its saturation value is scaled by a factor derived from the slider, and the result is converted back to RGB. This keeps hue and lightness stable while only the colour intensity changes.
Will -100 give a true greyscale?
Yes. At -100 the saturation multiplier reaches zero, making every pixel achromatic. The resulting grey matches the HSL lightness of the original colour.
Does the image leave my device?
No. The saturation adjustment runs entirely in your browser using your device's resources. No file bytes are ever sent to a server.
Will transparency be preserved?
Yes. The alpha channel is not part of the HSL conversion and is passed through unchanged.
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