How to merge PDFs online
Last updated: April 2026 · Reading time: 2 minutes
Combining multiple PDFs into one document is one of the most common PDF tasks — for contracts, reports, application packages, and submission bundles. Here's how to merge up to 20 PDFs in under 60 seconds, free, with no account and no watermark.
Step-by-step
- 1
Open the PDFree merge tool at pdfree.app/en/tools/merge.
- 2
Drop up to 20 PDF files into the upload area, or click to select multiple files at once.
- 3
Reorder the files by dragging them — the final order is the order shown in the list.
- 4
Click 'Merge' and wait 5–20 seconds depending on total size.
- 5
Download the combined PDF. Source files are deleted from the server immediately after processing.
When merging is the right move (and when it isn't)
Merge when you need a single deliverable: contract bundles, school applications, expense report packages, signed-and-witnessed PDFs. Don't merge when source documents need to remain independently signed or when each component has different access controls — in that case, send a ZIP archive with the originals instead.
Frequently asked questions
How many PDFs can I merge at once?
PDFree allows merging up to 20 PDFs in a single operation on the free plan. If you need to combine more, merge in batches and then merge the resulting files together.
Do my files keep their bookmarks and form fields after merging?
Bookmarks are preserved per source file. Form fields are preserved but field names may collide if two source PDFs use the same field names. For documents with active form workflows, test the merged file before sending.
Can I rearrange the page order before merging?
Yes. PDFree lets you drag-and-drop files to reorder them before merging. The final PDF will follow the order shown in the file list. To rearrange pages within a single PDF after merging, use the reorder tool.
Is the merge process secure?
Files are uploaded over HTTPS, processed in server memory, and deleted immediately after download is delivered. No copies are retained, no logs of file contents are kept. For maximum privacy, ensure your network connection is trusted.