Black-and-white conversions with control
The Grayscale tool converts JPG, PNG and WebP images to true black and white using proper luminance weighting — greens, reds and blues are translated to the greys human vision actually perceives, rather than the flat, muddy result of naively averaging channels.
Monochrome is a stylistic choice with practical edges: it removes distracting colour casts from old scans, makes text-heavy screenshots easier to read, unifies mismatched photo sets into a coherent look, and often compresses smaller than the colour original. The conversion is applied in one pass in your browser, with the original file untouched on your disk.
Because processing is local, there is no privacy trade-off even for personal photos. Convert, preview, download — and if the mood changes, simply re-run the original through the tool again; nothing about the operation is destructive to your source file.
Like every Piclizer tool, this one runs entirely in your browser — your files stay on your device.