Convert PDF to Black and White Online – Pure B&W, No Gray
PDFmuto converts every page of a PDF to pure black and white in your browser, pushing each pixel to black or white with no gray. Nothing is uploaded to a server.
- No file limits
- No registration
- Free forever
- PDFs never leave your browser
Drop your PDF here
Supported format: PDF
Every pixel is pushed to pure black or white using a threshold — no gray at all. Ideal for fax, archival, or prepping pages for OCR.
How to Convert a PDF to Pure Black and White
Upload PDF
Drop the PDF you want to convert.
Apply Threshold to Remove Gray Tones
Click the button — every pixel is pushed to black or white.
Download Black and White PDF
Download the high-contrast version of your document.
Perfect for Fax, Archive, and OCR Preprocessing
Fax machines and many archival systems require 1-bit black-and-white pages. This tool delivers exactly that — nothing more, nothing less.
High-contrast B&W also gives OCR engines an easier job, improving recognition accuracy on scanned documents.
Conversion Details
| Output | Pure black and white PDF |
|---|---|
| Tones | No gray — threshold applied |
| Best for | Fax, archival, OCR prep |
| Registration | Not required |
| Upload | None, processed on your device |
Your PDFs never leave your browser
All processing happens locally on your device. Nothing is uploaded to a server, stored, or tracked.
Frequently asked questions
What does pure black and white mean?
Every pixel becomes either black or white based on a threshold — there are no gray tones at all, unlike a grayscale conversion.
Why would I want pure B&W?
Fax machines need it, archives prefer it, and OCR often reads better on high-contrast pages. It also compresses very small.
Is this different from grayscale?
Yes. Grayscale keeps shades of gray; this tool removes them entirely for maximum contrast.
Learn more about PDFs
Read practical guides for working with PDFs without uploading your files. Browse all guides →