About the PDF Black & White Converter
When you need a reliable pdf to black and white, the last thing you want is a clunky download or a paywall after your first file. PDF Black & White Converter solves the problem right in your browser tab, free and unlimited.
Convert colorful PDFs into printer-friendly black and white documents. It works equally well on desktop and mobile, requires no plugins, and there are no daily limits or premium tiers: every feature on this page is free.
Key Features
100% private processing
Files are processed with JavaScript inside your browser. Nothing is uploaded, so nothing can be intercepted, stored or leaked.
Original quality preserved
PDF operations copy your pages losslessly wherever possible — text stays selectable and images keep full resolution.
Completely free, no limits
No trial periods, no watermarks, no daily quotas and no account requirement — every feature is free for personal and commercial use.
Works on any device
Runs in Chrome, Firefox, Edge and Safari on Windows, macOS, Linux, Android and iOS. If it has a modern browser, it works.
Instant results
Because there is no upload or download queue, processing starts the moment you add a file and usually finishes in seconds.
Handles large documents
Multi-hundred-page PDFs are processed page by page with live progress, so even big files stay responsive.
How to Use the PDF Black & White Converter — Step by Step
Add your file
Click the upload area or drag and drop your file directly onto it. On phones you can pick from your gallery or camera.
Choose your settings
Adjust the options that appear — quality, size, format or layout depending on the tool. Sensible defaults are pre-selected, so you can also skip straight ahead.
Run the tool
Press the action button and watch the progress bar. Everything happens locally, so speed depends only on your device — not on a server queue.
Download the result
Preview the output where available, then click download. Multiple output files are automatically bundled into a convenient ZIP archive.
Why Use an Online PDF Black & White Tool?
Understanding the formats involved helps you get the best result. PDF preserves exact layout, fonts and pagination on every device, which is why it is the universal standard for contracts, reports, forms, invoices and ebooks.
Working with PDFs in the browser is possible thanks to mature open-source libraries that read and write the PDF specification directly in JavaScript. That architecture is what allows Onnax Tools to skip the server entirely: your document is parsed, modified and rebuilt inside the browser tab, and the moment you close the page, nothing remains anywhere.
The biggest advantage of an in-browser pdf black & white converter is the combination of speed and privacy. Upload-based services spend most of their time transferring your file both ways; here that time is zero, and so is the privacy risk. Add zero cost, zero installation and cross-device support, and there is rarely a reason to reach for desktop software for this task.
Onnax Tools vs. Traditional Software
| Aspect | Onnax Tools (this tool) | Desktop software / upload services |
|---|---|---|
| Price | Free, unlimited | Often $10–25/month subscription |
| Installation | None — works in any browser | Download and install required |
| File privacy | Files never leave your device | Files uploaded to company servers* |
| Registration | Not required | Account usually required |
| Watermarks | Never | Common on free tiers |
| Works on phones | Yes, fully responsive | Often desktop-only |
*Applies to upload-based online services; desktop software keeps files local but must be purchased and installed.
Common Use Cases
- Small businesses preparing invoices, quotes and contracts for clients without buying Acrobat
- Job seekers tailoring and assembling CVs, cover letters and certificates into one application PDF
- Legal and administrative work: redacting, splitting and archiving official correspondence
- Remote teams standardizing reports and documentation shared across departments
- Anyone emailing documents that exceed attachment size limits
- Students combining lecture notes, assignments and scanned pages into organized study documents
📖 Want the full walkthrough? Read our detailed guide: How to Convert PDF Black & White Online for Free (Step-by-Step Guide)