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ark-to-every-pdf-page.md",{"type":181,"value":182,"toc":367},"minimark",[183,187,201,206,209,217,220,224,240,243,299,310,313,316,320,323,326,333,336,339,343,346,349,364],[184,185,186],"p",{},"一本旅行画册或活动资料已经排成 PDF，分享前想在每页角落加上同一张图片标记。如果把带白底的图片直接放上去，标记周围的白色矩形也会盖住原来的照片；逐页粘贴，又容易漏掉某一页。",[184,188,189,190,195,196,200],{},"图文工具箱的",[191,192,194],"a",{"href":193},"https:\u002F\u002Fimgtool.net\u002Fpdf-watermark\u002F","PDF加水印工具","提供“图片水印”，可以把同一张图片按统一参数添加到整份 PDF。这里用一份四页、横竖方向交替的旅行测试文件，说明 ",[197,198,199],"strong",{},"PDF 每页加 PNG 图片水印","时最容易弄混的几个设置。配图展示的是当前网页预览。",[202,203,205],"h2",{"id":204},"先确认-png-本身有没有透明背景","先确认 PNG 本身有没有透明背景",[184,207,208],{},"工具的水印图片入口接受 JPG、JPEG 和 PNG。想让 Logo 或图片轮廓以外的区域透出 PDF 原来的内容，应准备一张本身带透明背景的 PNG。",[184,210,211,212,216],{},"文件名以 ",[213,214,215],"code",{},".png"," 结尾，不代表背景一定透明。如果图片已经有一块白底，调低“透明度”只会让整张图片一起变淡，不会自动把白底抠除。这个页面没有抠图或擦除背景的入口，需要先在图片编辑工具里处理好素材。",[184,218,219],{},"还要留意图片四周的透明空白：工具按整张图片的宽高缩放和定位。如果图案很小、外面却留了很宽的透明边缘，放进 PDF 后可能看起来离角落很远。先裁掉不需要的空白，比反复放大更容易得到合适的位置。",[202,221,223],{"id":222},"添加文件后切换到图片水印","添加文件后，切换到“图片水印”",[225,226,227,231,234,237],"ol",{},[228,229,230],"li",{},"点击“添加文件”，选入一个 PDF。页面一次处理一份文件，读取后会显示文件名和总页数。",[228,232,233],{},"在“水印设置”下切换到“图片水印”，点击“选择图片”，选入准备好的 PNG。",[228,235,236],{},"将“水印位置”从“平铺”改为“右上”，让每页只出现一个角落标记。",[228,238,239],{},"调整“缩放比例(%)”和“透明度”，然后查看下方“PDF预览”。",[184,241,242],{},"本例的 PNG 为 800 × 600 像素，采用下列参数。它是一张透明背景的旅行静物图，用来展示图片水印，不是真实品牌 Logo。",[244,245,246,262],"table",{},[247,248,249],"thead",{},[250,251,252,256,259],"tr",{},[253,254,255],"th",{},"设置项",[253,257,258],{},"本例数值",[253,260,261],{},"调整时看什么",[263,264,265,277,288],"tbody",{},[250,266,267,271,274],{},[268,269,270],"td",{},"水印位置",[268,272,273],{},"右上",[268,275,276],{},"有没有遮住页眉、标题或照片主体",[250,278,279,282,285],{},[268,280,281],{},"缩放比例(%)",[268,283,284],{},"15",[268,286,287],{},"图片是否太大，缩小后轮廓是否还能辨认",[250,289,290,293,296],{},[268,291,292],{},"透明度",[268,294,295],{},"0.7",[268,297,298],{},"标记能否看清，是否影响原页面内容",[184,300,304,305],{"className":301},[302,303],"flex","justify-center","\n  ",[306,307],"img",{"src":308,"alt":309},"\u002Fimage\u002F2026\u002Fpdf-watermark-png-corner-settings.webp","PDF加水印工具的图片水印设置，选择透明PNG，位置为右上，缩放比例15%，透明度0.7",[184,311,312],{},"“缩放比例”不是水印占页面宽度的百分比。同样填 15，源图片的像素尺寸不同，放进 PDF 后的大小也会不同，不能照搬数值后就跳过预览。当前界面的可调范围是 1%～500%。",[184,314,315],{},"“透明度”的数值方向也容易理解反：这里数值越小越淡，越接近 1 越明显；1 表示不额外降低图片整体的不透明度，PNG 原有的透明区域仍然保留。需要更淡时，可以从 0.7 往下调，再观察标记是否还清楚。",[202,317,319],{"id":318},"横竖页混排要分别查看水印的位置","横竖页混排，要分别查看水印的位置",[184,321,322],{},"同一个“右上”会按各页自己的尺寸定位。横向页和纵向页的宽度不同，同一张水印不会自动按页面宽度重新缩放，所以它在两种页面上占据的相对面积也不同。",[184,324,325],{},"用“上一页”“下一页”或“页码”控件切换预览，至少检查一张竖页、一张横页，再看封面和末页。下图是本例第 2 页的横向页面，右上角的透明 PNG 已叠加到画面上；图案周围没有额外的白色矩形，底下的页面仍可见。",[184,327,304,329],{"className":328},[302,303],[306,330],{"src":331,"alt":332},"\u002Fimage\u002F2026\u002Fpdf-watermark-png-landscape-preview.webp","四页横竖混排测试PDF的第2页横向预览，右上角叠加半透明PNG旅行静物图片水印",[184,334,335],{},"如果标记压住标题，可以试试“左上”“左下”或“右下”。图片水印没有独立的边距输入框，也不能在预览中拖动到任意坐标；尺寸变化时，角落位置的边距也会跟着变化。需要准确对齐某条基准线，或每页留白位置不同，更适合使用能够逐页摆放图片的 PDF 编辑器。",[184,337,338],{},"这里的“页码”只负责切换预览，不是指定处理范围。导出逻辑会把同一张水印按当前参数添加到所有页面，不能只处理正在看的第 2 页，也没有“跳过封面”或“仅奇数页”的选项。",[202,340,342],{"id":341},"下载后重新打开文件检查每一页","下载后，重新打开文件检查每一页",[184,344,345],{},"确认参数后点击“开始处理”，工具会生成加水印的 PDF，并通过浏览器下载。输出沿用原文件的基础文件名，下载后可另加“已加图片水印”等后缀，避免与原件混淆。",[184,347,348],{},"网页预览适合调整参数，最终交付前仍要打开实际下载的 PDF 检查：",[350,351,352,355,358,361],"ul",{},[228,353,354],{},"总页数和横竖方向是否与原文件一致，第一页和最后一页有没有遗漏水印。",[228,356,357],{},"深色照片、浅色留白上的标记是否都能辨认，透明区域有没有出现不需要的底色。",[228,359,360],{},"标记是否压住正文、页眉或页码，放大查看图片边缘是否清楚。",[228,362,363],{},"下载文件能否在自己常用的 PDF 阅读器中正常打开。",[184,365,366],{},"当前工具不提供多份 PDF 的批量队列，也不能为不同页面分别选择图片、位置或缩放值。水印是在页面上增加可见标记，不会给文件设置阅读密码，也不能保证图片不会被裁切或去除。保留原 PDF 和原始 PNG，后续需要换图或调整位置时，从原件重新处理，避免把水印一层层叠上去。",{"title":368,"searchDepth":369,"depth":369,"links":370},"",2,[371,372,373,374],{"id":204,"depth":369,"text":205},{"id":222,"depth":369,"text":223},{"id":318,"depth":369,"text":319},{"id":341,"depth":369,"text":342},"pdf-watermark","想给多页PDF统一放上Logo或图片标记，又不希望带着一块白底？本文说明PNG图片水印的选择方法、缩放比例与透明度的区别，以及横竖页混排时怎样预览位置、下载后检查每页效果。","md",{},true,"2026-10-14",{"title":6,"description":376},"blog\u002Fadd-png-watermark-to-every-pdf-page","OejUjP_W4sXLpMOhZEd_n2vUdrc7Hx0xcrR4AOnvE6E",{"previous":385,"next":386},{"path":8,"title":9,"published":380},null,1791957249420]