Convert a color image to grayscale or threshold it into black and white. Use sliders or exact values, optionally invert the effect, and download your result locally.
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Static PNG, JPEG or WebP · 20 MiB and 40 MP input. Working image is fitted to 2,400 px per side and 4 MP; download uses working dimensions.
Adjust a slider or enter an exact value, then click Apply effect. Every application starts from the original working image. Threshold uses weighted RGB brightness, without dithering or adaptive document cleanup.
Apply an effect to see your result.
Ready. Choose an image.
Original transparency is preserved in PNG and WebP. JPEG fills it with the selected background color. Original EXIF and GPS metadata are not copied. For exact black-and-white RGB values, choose PNG; lossy formats can add intermediate shades.
Finishing a photo or graphic? Add Rounded Corners before downloading your final image.
Your image is never uploaded to any server. Conversion and downloads run locally with Canvas and a disposable browser worker. No accounts, remote APIs or persistent input storage are required. Clear releases your source and result.
Grayscale converts RGB color to weighted brightness using 0.299 red + 0.587 green + 0.114 blue, rounded to the nearest byte. Its amount blends this effect with the original colors. Threshold maps that brightness to black or white, using white at or above the chosen threshold. This is a simple global threshold without dithering or adaptive cleanup.
Grayscale amount runs from 0% (original colors) to 100% (fully grayscale). Threshold runs from 0 to 255 and controls the black/white cutoff. Invert reverses the calculated gray or binary value before any grayscale amount blending. Slider and exact number inputs stay synchronized. Click Apply effect after changing a value.
One static PNG, JPEG or WebP up to 20 MiB, 40 MP and 16,384 pixels per side. Larger images are fitted to a working size within 2,400 pixels per side and 4 MP. Downloads use the working dimensions and are capped at 32 MiB.
PNG and WebP preserve the original alpha channel; JPEG fills transparency with your background color. Original EXIF and GPS metadata are not copied. Browser color and orientation handling applies. Lossy JPEG and WebP can introduce intermediate shades; use PNG for exact binary RGB values.
