Merging PDFs is essential when you want to combine documents such as invoices, reports, certificates, or scanned pages into a single file. With online tools, merging PDFs is quick and secure. Why Merge PDFs? Create a single, organized document Send fewer attachments Combine scanned pages Prepare files for printing How to Merge PDFs Online (Easy Steps) Open the Merge PDF tool on PDF MASTER TOOLS. Upload two or more PDF files. Rearrange the order. Click Merge and download the combined file. Tips for a Better Combined PDF Keep files in correct order Ensure pages are not rotated Compress after merging for a smaller size Conclusion Merging PDFs helps keep documents organized. Use our free online tool for the fastest experience.