PDF Merger

PDF Merger is the tool you reach for when a report arrives in three separate files, when you need to combine chapters of a document that were saved separately, or when you have scanned an agreement in parts and need a single file to email or print. Instead of installing desktop software or uploading sensitive documents to a third-party website, this tool reads each PDF directly in your browser, copies every page into a new combined document using the same underlying technology that desktop PDF editors use, and delivers the result as a download — all without any of your files leaving your device. The tool supports the standard PDF features you would expect: pages keep their original dimensions, orientation, and content fidelity. Text remains selectable and searchable; images and vector graphics are preserved exactly as they were. The output is a valid, standards-compliant PDF that opens in any PDF reader — Adobe Acrobat, Preview on Mac, browser built-in viewers, or mobile PDF apps. There is no watermark added, no page limit (though very large files may hit browser memory limits), and no quality degradation from re-encoding — pdf-lib, the library used here, preserves the original page content streams whenever possible. The order of the files in the list determines the order of pages in the output. If you need to interleave pages from different documents (page 1 from A, page 1 from B, page 2 from A, page 2 from B), use the PDF Splitter first to extract the individual pages, then merge them in the desired sequence. For password-protected PDFs, you will need to remove the protection first (using a desktop tool) as this tool cannot read encrypted files — this is by design, as decrypting protected content in a browser would be a security concern. Because all processing happens locally, performance depends on your device and the total size of the PDFs. A typical laptop handles 50-100 pages in a few seconds. If you are working with very large files (hundreds of pages, or files with many high-resolution embedded images), consider compressing them individually first with the PDF Compressor tool, then merging the lighter versions.