#Collaboration10 debatiendo

pdf-lib is what most people use for this. Upload it as a static resource, load it in an LWC with loadScript, pull the files' base64 VersionData from Apex, merge in the browser, then save the result back as a new ContentVersion.

Main reason to do it client-side rather than Apex: you skip the 6MB/12MB heap limit, so large files still work.

const merged = await PDFLib.PDFDocument.create();for (const b64 of base64Files) {  const doc = await PDFLib.PDFDocument.load(b64);  const pages = await merged.copyPages(doc, doc.getPageIndices());  pages.forEach(p => merged.addPage(p));}const out = await merged.saveAsBase64();

If the library misbehaves under Lightning Web Security, the usual workaround is running pdf-lib in a Visualforce page inside an iframe and passing data with postMessage.

If you'd rather not host the library, Api2Pdf and Adobe PDF Services both do merge via callout — but the files leave your org, which rules them out for most healthcare/finance work. 

Hi, 

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