Combine multiple PDFs into one document
Last updated: 2026-10-08
Merge PDF is a free, browser-based tool that combines multiple PDF files into a single document. Unlike most online mergers, PDF Master Pro processes files entirely inside your browser using the pdf-lib library — your documents are never uploaded to a server, so it works even with sensitive files like contracts or bank statements. There is no limit on the number of files you can merge in one session; users routinely combine 2 to 200+ PDFs at once. The merge order follows the order files are added, and pages are preserved at original quality with zero compression loss. The tool requires no account, no email signup, and no software installation — it runs instantly in Chrome, Firefox, Safari, or Edge on desktop or mobile. Output downloads directly as a single merged PDF. Because processing is local, merge speed depends on your device rather than internet upload speed, typically taking a few seconds even for large multi-file batches.
Unlimited. There is no cap on the number of files you can combine. Merge 2 or 200 PDFs in one go.
No. Merging is completely lossless. Every page is preserved at original quality.
You need to unlock them first using our Unlock PDF tool, then merge them.
No limits at all. Merge large PDFs of any size completely free.
Yes, all 32 tools are 100% free forever. No hidden charges, no premium version, no login required.
No. We have zero file size restrictions. Process any PDF of any size, as many times as you want.