OCplan PDF Generator

About

Client-side PDF generation for web apps using Chrome DevTools Protocol (Page.printToPDF). Produces identical output to "Save as PDF" from the print dialog — silently, with no user interaction. Zero cost, no size limits, perfect WYSIWYG fidelity, with no pdf print server running.

Built by OCplan ApS.

How to integrate in your web app:

1. Install this extension
2. Detect the extension from your web app:

     if (window.__OCPLAN_PDF_EXTENSION__) {
       // Extension is available
     }

3. Request a PDF of the current page:

    const requestId = crypto.randomUUID();
     window.addEventListener("message", (event) => {
       if (event.data?.type === "OCPLAN_PDF_RESULT" && event.data.requestId === requestId) {
         if (event.data.success) {
           const bytes = Uint8Array.from(atob(event.data.pdfBase64), c => c.charCodeAt(0));
           const blob = new Blob([bytes], { type: "application/pdf" });
           // Use the PDF blob (download, upload, etc.)
         }
       }
     });

     window.postMessage({
       type: "OCPLAN_GENERATE_PDF",
       requestId,
       options: {
         paperWidth: 8.27,
         paperHeight: 11.69,
         printBackground: true,
         scale: 1,
         marginTop: 0,
         marginBottom: 0,
         marginLeft: 0,
         marginRight: 0,
       }
     }, "*");

  
Options: paperWidth, paperHeight (inches), printBackground (boolean), scale (number), marginTop/Bottom/Left/Right (inches).