PDF Merger

Merging PDFs is one of the most common document tasks in professional and personal workflows. Businesses regularly need to combine invoices, contracts, and reports into single documents for archiving or sharing. Students merge lecture notes, assignments, and research papers into comprehensive study materials. Legal professionals combine case documents, evidence files, and correspondence into organized case files. Real estate agents merge property documents, inspection reports, and disclosures into complete listing packages. The AllTools PDF Merger handles all these use cases directly in your browser using the pdf-lib JavaScript library. Unlike cloud services like iLovePDF or SmallPDF that require uploading your documents to their servers, this tool processes everything locally on your device. Your confidential contracts, financial statements, and personal documents never leave your computer — making it ideal for sensitive materials that shouldn't be transmitted over the internet.

The AllTools PDF Merger uses pdf-lib, a pure JavaScript library that manipulates PDF files entirely within your browser. When you add PDF files, they are read into your browser's memory using the FileReader API — no network upload occurs. The merging process copies pages from each source PDF into a new document, preserving all content including text, images, fonts, annotations, and form fields. The reorder feature lets you arrange files in your preferred sequence before combining them, and the page count display helps you verify you have the right documents. Once merged, the result is generated as a downloadable Blob — a binary data object that exists only in your browser's memory. Clicking download creates a temporary URL to save the file locally. The entire process typically takes just seconds, even for documents with dozens of pages, because there is no upload or download latency. After you navigate away from the page, all temporary data is automatically cleared from memory.