Question 1

How do I make an image black and white?

Accepted Answer

Upload your image, pick 'Grayscale' for a smooth gray photo or 'Black & White' for a pure two-tone effect, adjust the brightness/contrast (or threshold for B&W), then download the result.

Question 2

What is the difference between grayscale and black and white?

Accepted Answer

Grayscale keeps every shade of gray (256 levels), producing a realistic monochrome photo. Black and white (also called 1-bit) forces every pixel to pure black or pure white based on a threshold you set, creating a high-contrast stamp or stencil effect.

Question 3

Which grayscale formula is best?

Accepted Answer

The Luminosity method (0.299R + 0.587G + 0.114B) matches how human eyes perceive brightness and looks most natural. The Average method takes the simple mean of R, G and B. Lightness uses (max+min)/2.

Question 4

Is my image uploaded to a server?

Accepted Answer

No. Every pixel operation runs locally in your browser via the Canvas API. Your image never leaves your device.