Convert your PDF documents to strict black and white (monochrome) for optimal printing and reduced file sizes. All processing happens in your browser.
Click to upload or drag and drop your PDF file here
为保护您的隐私，所有处理均直接在您的浏览器中进行。这意味着：
Click "Select PDF File" or drag and drop your PDF into the selection area. Your file is processed locally for privacy.
Use the threshold slider to control the black & white conversion. Lower values create more black pixels, higher values create more white pixels.
Click "Convert to B&W" to process your document. Each page is converted to strict monochrome (1-bit) format.
Preview the first page and download your black & white PDF, perfect for printing or archival purposes.
Strict B&W uses significantly less ink than grayscale or color, perfect for draft prints or text-heavy documents.
All conversion is performed in your browser. Your PDF files are never sent to a server, ensuring data privacy.
For some documents, especially line art or text, B&W can offer sharper and clearer output than grayscale.
Converting color or grayscale images within a PDF to 1-bit B&W can significantly reduce the overall file size.
No upload/download delays for processing. Get your monochrome PDF quickly without waiting times.
Fine-tune the black and white conversion point to get the best results for your specific PDF content.