Create a true grayscale copy of an image
FiloTool converts every pixel to a neutral gray based on its red, green and blue values. This is different from merely lowering saturation in a page stylesheet: the downloaded file contains the grayscale pixels and keeps the original width and height.
When grayscale helps
Use it to preview artwork intended for monochrome printing, remove distracting color from a reference image, or create a consistent black-and-white asset. Grayscale cannot recover contrast that was missing in the source, and different colors with similar brightness may become nearly identical shades.
Output and privacy
Processing stays in the browser. JPG, PNG and WebP inputs keep their recognized format; browser-decodable alternatives fall back to JPG. JPG and WebP are re-encoded, so output size can change even though the dimensions do not.
Before downloading
Inspect faces, fine colored lines and text against colored backgrounds, because those areas can lose separation. For controlled saturation, brightness and contrast rather than a fixed conversion, use Image Filters. Use Image Compressor separately if file size is the actual concern.