Convert a colour PDF to grayscale (black & white) online for free. Great for cheaper printing and smaller file sizes — powered by Ghostscript on our server.
Grayscale PDF lets you convert a PDF to black & white online — fast, secure and simple. Upload your PDF and KOIAE gives you a black & white PDF in seconds, right in your browser. There is no installation and no watermark. Cut printing costs and shrink file size with a clean grayscale copy.
Drag and drop your PDF onto the Grayscale PDF tool above, or click to browse and select from your device.
KOIAE removes all colour while keeping the text and images sharp.
Click the button and download a black & white PDF instantly. Your files are deleted automatically afterwards.
Yes — Grayscale PDF is free. There is no account to create, no watermark on your files and generous daily limits for everyday use.
Drop files here or click to browse