Convert any photo to black and white — with an intensity slider so you can go fully monochrome or keep a hint of color. Classic luminance math, live preview.
Everything runs in your browser — your image never leaves your device.
Naive grayscale averages red, green and blue — and produces muddy, flat images. Real converters use the luminance formula from the ITU-R BT.601 standard, which weights channels by how human eyes perceive brightness:
Gray = 0.299 × R + 0.587 × G + 0.114 × B
Green dominates because our eyes are most sensitive to it. The result matches what a good photographer gets from a channel-based conversion in an editor — skies keep depth, skin keeps dimension.
Conversion happens pixel-by-pixel in your browser. Your photo is never uploaded to any server and never stored.
Select your image, drag the intensity slider to 100% for full monochrome (or less for a partial effect), then download as PNG or JPG. The preview updates instantly.
Technically, 'black and white' often means 1-bit (only pure black and pure white, like old faxes). What most people want is grayscale — the full range of gray tones. This tool produces true grayscale.
No — sepia is an alternative monotone look. Use grayscale mode for classic B&W, sepia mode for the warm vintage tone; the toggle switches between them.
Quality: no — pixel dimensions stay the same (export as PNG for zero loss). Size: grayscale images often get slightly smaller as JPG/PNG because there is less color information to encode.
That selective-color effect requires region masking, which is beyond a global converter. A trick: grayscale the photo here, then in any simple editor paste the original object back on top.
Convert HEIC to JPG first with our HEIC to JPG tool, then grayscale here — two clicks total, everything local.