Free · runs in your browser · nothing is uploaded · works offline
Convert a PDF to Grayscale (Black & White) Online — No Upload
Colour out, grayscale in — rendered on your device.
Colour out, grayscale in — rendered on your device.
Private by design: processing happens on your device with open-source libraries served from this site (licences). Nothing is uploaded, and once loaded the tool keeps working offline. Need other tools? All tools are on the homepage.
Free, no ads, no upsell. If it saved you a trip to a paid converter, you can buy the developer a coffee — it funds new tools and keeps this one free. ☕ Buy me a coffee
Runs on your deviceTested on Pixel 7 & MacBook Air M2Open-source engines · licences
About this tool
Each page is rendered at the DPI you choose, converted to grayscale and embedded back on a page of the same size. The result prints cleanly on mono printers and is usually smaller. Because the pages are re-rendered, the output is image-based; choose "keep text layer" if the tool offers it to retain searchable text.
Nothing is uploaded.
How it works
- Step 1. Choose or drop the PDF(s).
- Step 2. Pick 150, 200 or 300 DPI.
- Step 3. Press Convert and download <name>-gray.pdf.
Questions
Will the text still be selectable?
Pages become images; where the "keep text layer" option is available an invisible text layer is added so search still works.
Which DPI should I use?
200 DPI for office printing; 300 if the document has small print or fine lines.
Does it reduce file size?
Often, especially for colour scans; text-only PDFs may grow because they become images — compare the note.
Good to know
- Output is image-based.