免费 · PDF
PDF 转灰度（黑白 PDF）.
把彩色 PDF 转为灰度或纯黑白以节省墨水，可调分辨率、对比度和阈值。
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使用方法: PDF 转灰度（黑白 PDF）
输入数据或选择文件，调整设置并生成结果。复制或下载之前，请检查结果。
限制与支持格式
输入内容在您的设备上处理。
英语技术说明
Pages become images: text is no longer selectable (use the OCR tool to restore it). Up to 300 pages and 200 MB.
Each page is rendered with pdf.js, converted with the ITU-R BT.601 luminance formula (or a threshold for black and white) and placed in a new PDF at the original page size.
A 10-page colour brochure at 150 dpi becomes a grayscale PDF that prints without colour ink.