轉換為灰階
將您 PDF 的每一頁轉換為灰階（黑白）。
將您的 PDF 拖曳至此，或點選以選擇檔案
PDF 上限 100 MB
所有顏色（RGB、CMYK）都會轉換為灰階。文件內容與版面配置維持不變。
將您 PDF 的每一頁轉換為灰階（黑白）。
將您的 PDF 拖曳至此，或點選以選擇檔案
PDF 上限 100 MB
所有顏色（RGB、CMYK）都會轉換為灰階。文件內容與版面配置維持不變。
Converting a PDF to black and white, or more precisely to grayscale, turns every color into a shade of gray while keeping the layout, text and images intact. The most immediate benefit is printing: a grayscale PDF prints in monochrome, which costs noticeably less than color and avoids nasty surprises when a printer switches to color cartridges just to render a single logo.
Turning a PDF grayscale also brings consistency. For archives, scanned files or documents meant to be kept for a long time, a uniform look is easier to read and more neutral than a mix of pages in clashing colors. Removing color also neutralizes distracting elements — loud highlights, tinted backgrounds, oversaturated charts — and refocuses the reader's attention on the content itself.
As a bonus, dropping color information frequently reduces the file size, since each pixel no longer needs to store its color components. The effect depends on the document, but a grayscale PDF is generally more compact than its color original.
To go further, chain it with compress to shrink the file even more, then web-optimize if you plan to publish it online for faster loading. And if you want to trim useless margins or keep only a specific region before converting, crop lets you reframe each page. On privacy, our principles stay the same: no sign-up is required and your files are deleted automatically after processing.
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Upload your PDF file into the drop area (or drag and drop it).
Configure
將您 PDF 的每一頁轉換為灰階（黑白）。
Download
Download the resulting document in one click — your files are deleted automatically after processing.
Upload your PDF, then click "Convert to grayscale". All colors are converted to shades of gray and you download the new document in seconds.
It often reduces file size and allows cheaper black-and-white printing, while ensuring a consistent look for documents you need to archive.
Often yes, because color information is removed from every page. The gain depends on the document, though, with image-heavy PDFs benefiting the most.
Yes, only color is converted and the text keeps its full sharpness. This is ideal for economical printing and archiving readable documents without color ink.
Yes, this tool is 100% free with no usage limits. No sign-up, no credit card and no watermark added to your documents.
Yes. Your files are processed securely and automatically deleted from our servers after processing. Nobody has access to them.