{"id":107,"date":"2026-04-24T07:52:16","date_gmt":"2026-04-24T07:52:16","guid":{"rendered":"https:\/\/ompdf.com\/?page_id=107"},"modified":"2026-04-25T06:12:28","modified_gmt":"2026-04-25T06:12:28","slug":"invert-pdf","status":"publish","type":"page","link":"https:\/\/ompdf.com\/?page_id=107","title":{"rendered":"Invert PDF"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\t\t\t\n\n\n\n\nInvert PDF Colors<\/title>\n\n<style>\nbody {\n background:#000;\n color:#fff;\n font-family:Arial, sans-serif;\n padding:20px;\n}\n.container {\n max-width:600px;\n margin:auto;\n border:1px solid #333;\n padding:20px;\n border-radius:8px;\n background:#111;\n}\ninput[type=\"file\"] {\n width:100%;\n margin-bottom:15px;\n}\nbutton {\n width:100%;\n padding:12px;\n background:#1e90ff;\n border:none;\n border-radius:5px;\n color:white;\n font-size:16px;\n cursor:pointer;\n}\nbutton:disabled {\n background:#555;\n}\n.progress-container {\n margin-top:15px;\n background:#222;\n height:20px;\n border-radius:10px;\n overflow:hidden;\n}\n.progress-bar {\n height:100%;\n width:0%;\n background:#00ff99;\n transition:width 0.2s;\n}\n.status {\n margin-top:10px;\n text-align:center;\n font-size:14px;\n}\n.downloads a {\n display:block;\n color:#00ffcc;\n margin-top:8px;\n text-decoration:none;\n}\n<\/style>\n\n<script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/pdf.js\/3.11.174\/pdf.min.js\"><\/script>\n<script src=\"https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/jspdf\/2.5.1\/jspdf.umd.min.js\"><\/script>\n<\/head>\n\n<body>\n\n<div class=\"container\">\n<h2>Invert PDF (Black \u2192 White)<\/h2>\n\n<input type=\"file\" id=\"pdfInput\" accept=\"application\/pdf\" multiple>\n\n<button onclick=\"processPDFs()\">Convert PDF<\/button>\n\n<div class=\"progress-container\">\n<div class=\"progress-bar\" id=\"progressBar\"><\/div>\n<\/div>\n\n<div class=\"status\" id=\"statusText\">Waiting for files\u2026<\/div>\n\n<div class=\"downloads\" id=\"downloadLinks\"><\/div>\n<\/div>\n\n<script>\nconst { jsPDF } = window.jspdf;\npdfjsLib.GlobalWorkerOptions.workerSrc =\n'https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/pdf.js\/3.11.174\/pdf.worker.min.js';\n\nasync function processPDFs() {\n const files = document.getElementById('pdfInput').files;\n if (!files.length) return alert(\"Select PDF files\");\n\n document.getElementById(\"downloadLinks\").innerHTML = \"\";\n const totalFiles = files.length;\n let completed = 0;\n\n for (const file of files) {\n await processSinglePDF(file, progress => {\n const base = completed \/ totalFiles * 100;\n const portion = progress \/ totalFiles;\n updateProgress(base + portion);\n });\n completed++;\n }\n updateProgress(100);\n document.getElementById(\"statusText\").innerText = \"All files converted \u2714\";\n}\n\nasync function processSinglePDF(file, progressCallback) {\n const arrayBuffer = await file.arrayBuffer();\n const pdf = await pdfjsLib.getDocument({ data: arrayBuffer }).promise;\n\n const pdfOut = new jsPDF({ unit:\"pt\", compress:true });\n\n for (let i = 1; i <= pdf.numPages; i++) {\n const page = await pdf.getPage(i);\n const viewport = page.getViewport({ scale:2 });\n\n const canvas = document.createElement(\"canvas\");\n const ctx = canvas.getContext(\"2d\");\n canvas.width = viewport.width;\n canvas.height = viewport.height;\n\n await page.render({ canvasContext:ctx, viewport }).promise;\n\n const imgData = ctx.getImageData(0,0,canvas.width,canvas.height);\n const d = imgData.data;\n\n for (let j = 0; j < d.length; j += 4) {\n d[j] = 255 - d[j]; \n d[j+1] = 255 - d[j+1]; \n d[j+2] = 255 - d[j+2]; \n }\n ctx.putImageData(imgData,0,0);\n\n if (i > 1) pdfOut.addPage([viewport.width, viewport.height]);\n\n pdfOut.addImage(\n canvas.toDataURL(\"image\/jpeg\",1.0),\n \"JPEG\",\n 0,0,\n viewport.width,\n viewport.height\n );\n\n progressCallback((i \/ pdf.numPages) * 100);\n }\n\n const blobUrl = pdfOut.output(\"bloburl\");\n const link = document.createElement(\"a\");\n link.href = blobUrl;\n link.download = file.name.replace(\".pdf\",\"-inverted.pdf\");\n link.innerText = \"Download \" + link.download;\n document.getElementById(\"downloadLinks\").appendChild(link);\n}\n\nfunction updateProgress(percent){\n document.getElementById(\"progressBar\").style.width = percent + \"%\";\n document.getElementById(\"statusText\").innerText =\n \"Progress: \" + Math.round(percent) + \"%\";\n}\n<\/script>\n\n<\/body>\n<\/html>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Invert PDF Colors Invert PDF (Black \u2192 White) Convert PDF Waiting for files\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-107","page","type-page","status-publish","hentry"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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