Free Online Grayscale Converter

Convert color photos to professional black and white images instantly. No upload required - transform your images to grayscale directly in your browser with complete privacy protection.

Drag and drop or click to upload image

Max 10MB, image/* files only

About Grayscale Conversion

Our grayscale converter uses the standard luminance formula to create natural-looking black and white images:

Gray = 0.299 × Red + 0.587 × Green + 0.114 × Blue

This formula takes into account the human eye's different sensitivity to red, green, and blue light, resulting in grayscale images that preserve the perceived brightness of the original.

Instant processing in your browser
No quality loss - original resolution maintained
Privacy-first - images never leave your device
Support for all common image formats