How to use
- Select or drop a PDF file into the dropzone.
- Pick a render scale (1.5×, 2×, or 3× — 2× is a good default).
- Click Convert to grayscale and let each page render locally.
- Download your new black-and-white grayscale PDF.
Frequently asked questions
How do I convert a PDF to grayscale?
Drop your PDF into the tool, choose a render scale, and click Convert to grayscale. Each page is rendered and every pixel is desaturated using its luminance, then a new black-and-white PDF is built for you to download.
Is my PDF uploaded to a server?
Never. The PDF is rendered, converted and rebuilt entirely on your device. Everything is 100% in your browser and nothing is ever uploaded, so your document stays private.
Will the text still be selectable after converting?
No. To apply the grayscale conversion each page is flattened to an image, so the rebuilt PDF no longer contains selectable or searchable text — it becomes an image-based PDF.
What does render scale change?
Scale controls how sharply each page is rendered before conversion. 1.5× is lighter and smaller, 2× is a balanced default, and 3× gives crisper pages at the cost of a larger file size.
Is there a file size or page limit?
There is no fixed limit. Since everything runs locally in your browser, very large PDFs or high scales use more memory, so choose a lower scale if a huge file feels slow.
Why convert a PDF to black and white?
Grayscale removes all colour so the PDF prints cleanly in black and white, avoids using colour ink, and the resulting monochrome file is often smaller than the colour original.
About this tool
Free grayscale PDF converter: turn a color PDF into black and white in your browser. Renders each page, desaturates every pixel, rebuilds the PDF. No uploads.