[{"data":1,"prerenderedAt":218},["ShallowReactive",2],{"tool-content-pdfToGrayscale-zh":3,"editor-messages-pdfToGrayscale-zh":83},{"metaTitle":4,"metaDescription":5,"h1":6,"intro":7,"howToSteps":8,"howToTitle":18,"faq":19,"faqTitle":41,"benefits":42,"useCases":67,"useCasesTitle":77,"relatedToolsTitle":78,"relatedReasons":79},"PDF转黑白：免费在线转换，支持灰度 | Visual PDF","把PDF免费转成黑白或灰度：每一页都有实时预览，可以只转换部分页面，文字依然可以选中。文件全部在您的浏览器中处理，不会离开您的设备，无需注册账号。","PDF转黑白","把PDF转成灰度以节省打印墨水，或者转成纯黑白让扫描件更清晰。自由挑选需要转换的页面，并实时查看每一页的效果。您的文件完全在浏览器中处理，绝不离开设备。",[9,12,15],{"title":10,"content":11},"打开您的PDF","把PDF文件拖入上方区域，或从您的设备中选择。每一页都会立即载入并显示实时预览。",{"title":13,"content":14},"选择颜色模式和页面","选择“灰度”以保留平滑细节，或选择“纯黑白”获得高对比度的清晰效果。默认会选中所有页面，您可以点击某一页让它保留彩色，也可以通过“页面范围”指定要转换的页码。",{"title":16,"content":17},"确认并下载","点击“确认”开始转换，然后点击“下载”保存处理好的PDF文件。文字依然可以正常选中，矢量图形清晰无损，且不添加任何水印。","如何把PDF转成黑白",[20,23,26,29,32,35,38],{"q":21,"a":22},"灰度与纯黑白有什么区别？","灰度模式包含256级灰色，可以在去除颜色的同时完整保留照片、图表和渐变效果的层次细节。纯黑白模式只保留纯黑和纯白两种颜色，没有任何灰色过渡，就像高对比度的复印件。灰度非常适合用来打印带有图片的演示文稿或文档，而纯黑白则最适合处理文字扫描件和单据。",{"q":24,"a":25},"如何把PDF转成没有任何灰色的纯黑白？","在工具中选择“纯黑白”模式。与灰度不同，该模式会将每个像素严格处理为纯黑或纯白（1位），并消除泛灰的纸张底色与扫描阴影。这样可以得到对比鲜明、字迹分明的页面，特别适合发票、表单和文档扫描件。",{"q":27,"a":28},"转成黑白后再打印，能节省彩色墨水吗？","可以。在打印前先用本工具把PDF转换成黑白并下载，之后在任何PDF阅读软件中正常打印即可。因为文件本身已经是黑白内容，无论使用哪台打印机，都无需额外调整打印机参数，能有效避免误用昂贵的彩色墨水或墨粉。",{"q":30,"a":31},"我的文件会被上传到服务器吗？","不会。所有的转换处理均在您的电脑或手机浏览器本地完成。您的文件绝不会离开您的设备，不会上传到任何服务器，也不会被保存或查看。您可以随时在浏览器的网络面板中进行验证。",{"q":33,"a":34},"转成灰度后PDF的文件体积会变小吗？","通常会变小。彩色图片包含红、绿、蓝三个颜色通道，而灰度图片只有一个通道，因此包含较多图片的文档在转换后往往会明显缩小。如果是纯文字文档，体积变化不会太大。如果您需要精确减小文件大小，建议在转换后使用我们的“PDF压缩”工具。",{"q":36,"a":37},"可以只转换部分页面，让其他页面保持彩色吗？","可以。默认情况下所有页面都会参与转换，但您可以直接点击任意页面缩略图让其保持原有的彩色（例如封面或重点图表）。您也可以使用“页面范围”快速指定一段连续的页面进行转换。",{"q":39,"a":40},"转换后PDF里的文字还能正常选中和搜索吗？","可以。本工具直接在PDF内部重新着色文字和矢量图形，而不是把整页压平成图片。因此文字依然可以自由选中、复制和搜索，线条和字体在放大时也依然清晰锐利。","PDF转黑白常见问题",[43,47,51,55,59,63],{"title":44,"content":45,"icon":46},"每页都有真实的实时预览","缩略图展示的是转换后的实际效果，而非简单的滤镜模拟，方便您在下载前逐页确认。","i-hugeicons-document-validation",{"title":48,"content":49,"icon":50},"双模式：灰度与纯黑白","照片和图表推荐选择“灰度”，需要提高扫描文本对比度时推荐选择“纯黑白”。","i-hugeicons-printer-check",{"title":52,"content":53,"icon":54},"只转换您挑选的页面","支持整份转换，也可以单选页面或使用“页面范围”，方便为封面保留彩色。","i-hugeicons-file-edit",{"title":56,"content":57,"icon":58},"文字可选中，矢量依然清晰","直接对文档内容重新着色而不栅格化成图片：文字支持选中与搜索，图形保持清晰。","i-hugeicons-text-font",{"title":60,"content":61,"icon":62},"文件绝不离开您的设备","转换完全在浏览器本地运行，您的文件不会上传至任何服务器，保障私密安全。","i-hugeicons-security-lock",{"title":64,"content":65,"icon":66},"免费且不加水印","无需注册账号，无需付费，转换次数不设限制。下载的PDF文件不会被添加任何水印。","i-hugeicons-checkmark-square-01",[68,71,74],{"title":69,"content":70},"节省打印时的彩色墨水","在打印前把报告、课件或合同转成灰度，使用黑色墨水即可清晰打印出图表和排版内容。",{"title":72,"content":73},"清理并统一扫描件效果","使用纯黑白模式去除纸张底灰与扫描暗影，让发票和文档呈现清晰整洁的复印效果。",{"title":75,"content":76},"满足黑白出版或提交规范","快速制作符合学术期刊、官方办事流程或印刷厂要求的纯单色与标准灰度PDF文件。","什么时候需要把PDF转成黑白","相关的PDF工具",{"compressPdf":80,"pdfToImages":81,"mergePdfFiles":82},"需要更小的文件方便发送？压缩您的黑白PDF。","把黑白PDF页面导出为高画质的图片文件。","先合并多份文档，然后一次性全部转成黑白。",{"current":84,"fallback":150},{"common":85,"tool":137},{"processingTitle":86,"processingFailedTitle":87,"readyTitle":88,"errorTitle":89,"errorDescription":90,"fileUnreadableTitle":91,"fileUnreadableDescription":92,"fileMissingTitle":93,"fileMissingDescription":94,"selectFileAgain":95,"retry":96,"downloadZip":97,"downloadFileTooltip":98,"validate":99,"download":100,"moreActions":101,"continueEditing":102,"backToEdition":103,"editAnotherFile":104,"restart":105,"feedback":106,"editNewFileWith":107,"renameFile":108,"printFile":109,"archiveFailedTitle":110,"archiveFailedDescription":111,"downloadFailedTitle":112,"downloadFailedDescription":113,"printFailedTitle":114,"printFailedDescription":113,"colorPickerCustom":115,"officeConvertButton":116,"rateThisTool":117,"inputFile":118,"inputFiles":118,"moveLeft":119,"moveRight":120,"selectPagesTitle":121,"addPagesRange":122,"addPageSingle":123,"rangeFrom":124,"rangeTo":125,"ratingQuestion":126,"ratingThanksTitle":127,"ratingDoneTitle":128,"ratingBad":129,"ratingMeh":130,"ratingGood":131,"ratingSend":132,"ratingSentDescription":133,"ratingAlreadyRated":134,"ratingErrorExpired":135,"ratingErrorGeneric":136},"正在处理您的文件","处理过程中出错了","文件已经处理好了！","我们这边出了点问题","我们已经收到这条错误报告，给您带来不便，非常抱歉。","我们读不到您的文件了","它可能在打开之后被移动、改名或者编辑过了，请重新选择一次。","您的文件已经不在了","请重新选择一次，好在这里完成操作。","重新选择文件","重试","全部下载（.zip）","下载文件","确认","下载","更多操作","继续编辑","返回编辑","编辑其他文件","重新开始","给我们提点建议","用其他工具继续处理","重命名文件","打印文件","压缩包生成失败","无法生成压缩包，请逐个下载文件。","下载失败","链接可能已经失效，请重新转换一次文件。","打印失败","自定义","转换","给这个工具评分","源文件","向左移动这一页","向右移动这一页","选择页面","添加第{from}至{to}页","添加第{n}页","从","到","您觉得“{tool}”这个工具好用吗？","谢谢！还想多说几句吗？","谢谢您！","不好用","一般","好用！","发送","我们已经收到您的留言，非常感谢您的帮助。","您已经给这个工具评过分了，再次感谢您的帮助！","评分已保存，但现在补充留言已经太晚了。","留言没能保存，请再试一次。",{"modeTitle":138,"modeGrayscale":139,"modeGrayscaleHint":140,"modeMonochrome":141,"modeMonochromeHint":142,"selectPage":143,"deselectPage":144,"rangeTitle":145,"rangeLabel":146,"previewLoading":147,"reset":148,"fileSuffixGrayscale":139,"fileSuffixMonochrome":149},"颜色模式","灰度","照片和图形的细节全部保留，只是没有了颜色。打印效果最好。","纯黑白","只有黑和白，没有灰：文字锐利，扫描件干净，就像复印出来的一样。","转换这一页","这一页保留彩色","页面范围","只转换第{from}至{to}页","正在生成预览…","重置","黑白",{"common":151,"tool":204},{"processingTitle":152,"processingFailedTitle":153,"readyTitle":154,"errorTitle":155,"errorDescription":156,"fileUnreadableTitle":157,"fileUnreadableDescription":158,"fileMissingTitle":159,"fileMissingDescription":160,"selectFileAgain":161,"retry":162,"downloadZip":163,"downloadFileTooltip":164,"validate":165,"download":166,"moreActions":167,"continueEditing":168,"backToEdition":169,"editAnotherFile":170,"restart":171,"feedback":172,"editNewFileWith":173,"renameFile":174,"printFile":175,"archiveFailedTitle":176,"archiveFailedDescription":177,"downloadFailedTitle":178,"downloadFailedDescription":179,"printFailedTitle":180,"printFailedDescription":179,"colorPickerCustom":181,"officeConvertButton":182,"rateThisTool":183,"inputFile":184,"inputFiles":185,"moveLeft":186,"moveRight":187,"selectPagesTitle":188,"addPagesRange":189,"addPageSingle":190,"rangeFrom":191,"rangeTo":192,"ratingQuestion":193,"ratingThanksTitle":194,"ratingDoneTitle":195,"ratingBad":196,"ratingMeh":197,"ratingGood":198,"ratingSend":199,"ratingSentDescription":200,"ratingAlreadyRated":201,"ratingErrorExpired":202,"ratingErrorGeneric":203},"Your files are being processed","An error occurred during processing","Your files are ready!","Something went wrong on our side","We have been informed of this error. We apologize for any inconvenience caused.","We can no longer read your file","It may have been moved, renamed or edited since you opened it. Please select it again.","Your file is no longer loaded","Please select it again to finish here.","Select the file again","Retry","Download all (.zip)","Download file","Validate","Download","More actions","Continue editing","Back to edition","Edit another file","Restart","Give us your feedback","Continue editing with another tool","Rename file","Print file","Archive failed","We could not build the archive. Please download the files one by one.","Download failed","This link may have expired. Please convert the file again.","Print failed","Custom","Convert","Rate this tool","Input file","Input files","Move page to the left","Move page to the right","Select pages","Add pages {from}...{to}","Add page {n}","From","To","Did you enjoy our \"{tool}\" tool?","Thanks! Want to tell us more?","Thank you!","No","So-so","Yes!","Send","We have received your message. Thank you for your valuable help.","You have already rated this tool. Thanks again for your help!","Your rating was saved, but it is too late to add a message.","We could not save your message. Please try again.",{"modeTitle":205,"modeGrayscale":206,"modeGrayscaleHint":207,"modeMonochrome":208,"modeMonochromeHint":209,"selectPage":210,"deselectPage":211,"rangeTitle":212,"rangeLabel":213,"previewLoading":214,"reset":215,"fileSuffixGrayscale":216,"fileSuffixMonochrome":217},"Color mode","Grayscale","Shades of gray: photos and graphics keep their detail, just without color. Best for printing.","Black & white","Pure black and white, no grays: crisp text and clean scans, the photocopy look.","Convert this page","Keep this page in color","Range selection","Only pages {from}..{to}","Generating preview…","Reset","grayscale","black-and-white",1787593936565]