Black and White Image Converter

This tool removes colour from images in three ways. Grayscale converts each pixel to its brightness using the standard luminance weights for red, green and blue, so skies, skin and foliage keep their natural tone instead of turning a flat grey. Sepia gives a warm brown, old-photograph tone. Both have a strength slider (partial black and white looks muted rather than grey) and a contrast slider for a punchier result.

Document mode makes every pixel either pure black or pure white. It is meant for phone photos of paper, receipts, notes and signatures: the grey paper and shadows turn white and the ink turns black, which makes text easier to read, print and upload to forms that need a clean scan. With "Even out shadows" on, each area is compared with its surroundings, so a shadow across the page doesn't turn into a black blob; turn it off for evenly lit scans. A darkness slider adds or removes ink.

You can convert up to 30 images in one run with the same settings and download them as a ZIP. The original format is kept by default; for document mode, PNG gives the sharpest and often the smallest file. Limits: document mode isn't a full scanner app (it doesn't straighten or crop the page), and saving removes EXIF data.

Black and white hides distracting colours, gives portraits a timeless look and makes a mixed set of photos look consistent. For documents, a clean black-on-white image is easier to read and is what many application portals and printers handle best.