Image Grayscale - Free Online Tool | PivaBox

Convert images to grayscale with adjustable RGB channel mixing weights

How to Use Image Grayscale Tool

1. Upload an image by clicking the upload area or dragging and dropping a file
2. Choose a grayscale mode: Standard, Luminosity, Average, or custom RGB channel mixing
3. Preview the grayscale result in real time and click Download to save

Frequently Asked Questions

Is Image Grayscale free?

Yes, PivaBox Image Grayscale is completely free. All processing is done in your browser using Canvas API.

Are my images uploaded to a server?

No. All grayscale conversion is done locally in your browser. Your images never leave your device.

What is the difference between grayscale modes?

Standard mode uses the standard luminance formula (0.299R + 0.587G + 0.114B). Average mode takes a simple average of RGB channels. Luminosity mode weights green more heavily (matching human perception). Custom mode lets you adjust each RGB channel individually for artistic effects.