PDF to Grayscale
Convert color PDFs to grayscale or black & white (monochrome) using Ghostscript. Reduce file sizes by removing color information, prepare documents for black & white printing, or create professional monochrome documents.
or Drag & drop files here
Supported formats: .pdf, application/pdf
Convert PDF to Grayscale or Black & White
Transform color PDFs into grayscale or monochrome (black & white) documents using advanced Ghostscript technology. Perfect for reducing file sizes (30-50% smaller), preparing documents for black & white printing, creating professional monochrome documents, or archival purposes. Process files entirely in your browser with optional compression to further reduce file size.
Key Features:
- Convert to grayscale (256 shades of gray) or monochrome (pure black & white)
- Reduce file size by 30-50% by removing color information
- Batch convert up to 20 files simultaneously (100MB each)
- Choose quality level: High, Medium, or Low to balance quality vs file size
- Optional compression to further reduce file size after conversion
- 100% browser-based processing with WebAssembly
- Complete privacy - files never uploaded to servers
How to convert PDF to grayscale:
- 1
Upload color PDF files (up to 20 files, 100MB each)
- 2
Choose conversion mode (grayscale or monochrome) and quality level
- 3
Click "Convert to Grayscale" to remove color
- 4
Download converted files individually or as ZIP
Your Privacy is Protected
All conversions happen locally in your browser. Your files never leave your device and are automatically deleted when you close this page.
Frequently Asked Questions
Grayscale uses 256 shades of gray, preserving smooth gradients and details. Monochrome uses only pure black and white pixels (no gray), creating a high-contrast effect similar to photocopies. Choose grayscale for photos and detailed graphics, monochrome for text documents and simple diagrams.
Typical reduction: 30-50% for grayscale, 40-60% for monochrome. Actual reduction depends on original color content. Enable compression for additional 10-20% reduction. Photos and colorful graphics see the most reduction.
High: Best quality, minimal compression (for printing). Medium: Balanced quality and file size (recommended for most uses). Low: Smallest file size, more compression (for web/email).
Yes, completely safe. All processing happens in your browser using WebAssembly. No files are uploaded to servers. Original files are never modified. The conversion is permanent in output files.
No, color information is permanently removed during conversion. Grayscale PDFs cannot be converted back to color. Always keep a backup of your original color PDF if you might need it later.
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Your Privacy is Our Priority
Unlike other PDF tools, we process your files directly in your browser using WebAssembly technology. This means your sensitive documents never leave your device.
Browser Processing
Processing happens in your browser
No File Uploads
No files uploaded to our servers
No Storage
We don't permanently store your files
Complete Privacy
Your files never leave your device during processing
100% Privacy Guarantee
We use cutting-edge WebAssembly technology to process your PDFs entirely within your browser. No uploads to our servers, no data collection, no privacy concerns. Just pure, local processing power.
How Our Privacy-First Technology Works
WebAssembly Processing
We use WebAssembly (WASM) to run PDF processing libraries directly in your browser, eliminating the need to upload files to external servers.
Local Storage Only
Files are temporarily stored in your browser's memory during processing and automatically cleared when you close the tab or complete the task.
No Data Collection
We don't track, store, or analyze your file contents. Our analytics only measure tool usage patterns, not personal data.
GDPR Compliant
Our privacy-first approach means we're automatically compliant with GDPR, CCPA, and other privacy regulations worldwide.