Black and white image
Take the color out of a photo, and choose how hard the contrast lands.
Your file
Drop a file here, or click to choose
It stays on this device. Nothing is sent anywhere.
Settings
Contrast is the whole job
A straight desaturation often disappoints, because colors that felt very different can carry almost the same brightness. The result reads as a gray fog. Raising contrast pushes the darks down and the lights up, which is what gives monochrome photography its structure.
Portraits usually want a gentler hand than architecture or street scenes, where hard contrast flatters the geometry.
The two methods are not the same thing
Drop the color, keep the color space runs hue=s=0, which sets saturation to zero while the picture stays a three-channel RGB image. Every pixel ends up with equal red, green and blue values, so it looks gray and is still technically a color file. True grayscale converts to a single-channel format instead, discarding the two chroma channels outright.
Visually they are identical. The difference shows up elsewhere. A one-channel file is meaningfully smaller, sometimes by a third, and it is unambiguous to any software reading it. Against that, a handful of older programs, some print workflows and a few web frameworks assume three channels and will either refuse a single-channel image or render it oddly. If the picture is going somewhere you do not control, take the first option. If it is going into your own pipeline and size matters, take the second.
Judging the result
The usual mistake is judging a black and white conversion at thumbnail size. Contrast that looks punchy small is often crushed at full size, with the shadows gone solid black and everything in them lost for good. Work at full size, and if in doubt push contrast slightly less far than looks right.
Brightness and contrast interact. Raising contrast pivots the image around its midpoint, so a dark photograph loses its shadows first and a bright one blows its highlights. Lifting brightness a little before adding contrast keeps a dark original from collapsing. Both controls run through FFmpeg's eq filter in the same pass as the desaturation, so doing them together costs no extra generation of loss.
Common questions
Which format should I save to?
PNG if the image is going to be edited further, JPEG if it is going straight onto a page. Black and white JPEGs compress very well.
Is the color recoverable?
No. Keep the original file.
Why does my black and white photo look flat?
Because colors that looked very different often carry similar brightness, and brightness is all that survives. A red flower against green leaves can end up almost the same gray. Contrast is the only lever that separates them again, which is why it is set as the main control here rather than buried.
Does converting to black and white make the file smaller?
With JPEG and WebP, yes, noticeably: there is far less chroma detail to encode, and monochrome images compress well. Choosing true grayscale saves more again by storing one channel instead of three. With PNG the saving is smaller because it was already lossless.