Merge PDF combines two or more files into one document while preserving each source file's internal bookmarks, hyperlinks, and embedded fonts — most free mergers flatten these on the way through.
You can add up to 20 files at once on a free account.
Select several PDFs at once, or drop them in one by one. Each file shows as a thumbnail so you can see what you added.
Drag thumbnails into place. Files named 01, 02, 03 arrive already sorted. Remove anything you added by mistake.
Click Merge, then scroll through the combined file. Bookmarks and links from each source file carry over.
Download the merged PDF, or save it to My Files to open it later on another device.
Encrypted PDFs can't be merged. Run them through Unlock PDF (you'll need the password), then add them to the merge.
Naming files 01-cover.pdf, 02-report.pdf and so on makes them upload in the right order, so there's less dragging.
A4 and Letter pages keep their own size in the merged file. Nothing is stretched or cropped.
Joining many scans can produce a large file. Run the result through File Compressor before emailing it.
Accountants merge monthly invoices into one PDF for client reporting and bookkeeping software upload.
Lawyers merge contract drafts, addenda, and signed pages into a single executed PDF for court filing.
Students merge lecture slides, notes, and reference papers into one searchable PDF for exam prep.
The page tools overlap, so here is the quickest way to pick the right one.
| You want to… | Use this tool |
|---|---|
| Join several PDFs into one file | Merge PDF |
| Break one PDF into several files | Split PDF |
| Copy a few pages into a new PDF | Extract Pages |
| Delete pages you don't need | Remove Pages |
| Change the order of pages in one file | Reorder Pages |
Cross-references and hyperlinks are remapped to the new page numbers after merging.
You can merge up to 20 PDF files in a single operation on free accounts and unlimited files on Pro and Business plans. Each file can be up to 500 MB on Business.
No. Our merge PDF tool performs a lossless join — text, images, fonts, and formatting are preserved exactly as in the original PDFs.
You must first unlock password-protected PDFs using our Unlock PDF tool, then merge them. Encrypted files cannot be merged directly for security reasons.
Yes — drag thumbnails into any order before clicking Merge. You can also remove specific files from the merge queue before processing.
Yes. Guests can merge PDFs up to 30 times per day with no signup. Free accounts get higher limits, file history, and resumable jobs at no cost.
Merged files are auto-deleted within 24 hours on free and guest accounts. Pro and Business users can keep files permanently in My Files.
Never. PDFPilot4U does not add watermarks to merged PDFs on any plan — including the free tier — unlike most competitors.
Yes. The merge PDF tool works in any modern browser on iOS and Android. We also have dedicated mobile apps for offline merging.
