Whether you’re combining a cover letter with a CV, assembling a multi-section report, or consolidating invoices for a client, merging PDFs is a task that comes up constantly. Here’s the fastest, cleanest way to do it.
When You Need to Merge PDFs
Merging is useful whenever you need to: send multiple documents as a single attachment, create a combined report from separate sections, consolidate monthly invoices into a single file, or assemble a multi-chapter document from individual files.
How to Merge PDFs with PDFRun
PDFRun’s Merge PDF tool handles this in under a minute:
Step 1: Upload your files
Go to pdfrun.io/tool/merge and upload all the PDFs you want to combine. You can drag and drop multiple files at once, or click to browse and select them.
Step 2: Set the order
Files will be merged in the order they appear in the list. You can choose to merge “as uploaded” or in alphabetical order.
Step 3: Process and download
Click Run Tool. In a few seconds, your merged PDF is ready to download. All pages from all files are combined into a single document.
Tips for Clean Merges
Name your files with numbers first. If you want a specific order, name files like “01-intro.pdf”, “02-main.pdf”, “03-appendix.pdf” before uploading. This makes it easy to sort alphabetically and get the right order.
Check page orientation before merging. If some documents are landscape and others portrait, the merged PDF will contain both orientations — which can look inconsistent. Use PDFRun’s Rotate PDF tool to standardize orientation first.
Add bookmarks. PDFRun can automatically add bookmarks for each merged file, making navigation easier in the final document. Enable this option before processing.
What About File Size?
Merged PDFs are simply the combination of all input files. If your source PDFs are large, the merged result will be correspondingly large. After merging, you can run the result through PDFRun’s Compress PDF tool to reduce the file size before sending.
Ready to merge? Start here — free, no account needed.