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Printing a colour PDF on a black-and-white printer, or paying per colour page at a print shop, is wasteful. This tool turns every page, picture and drawing into shades of grey.
Text stays real text, so it remains sharp, searchable and copyable. Your file is uploaded only for this conversion and deleted immediately afterwards.
No. Text keeps its fonts and stays selectable; only its colour changes to grey or black.
Often a little, because grey pictures need less data than colour ones. If you need a much smaller file, use Compress PDF afterwards.