Merge PDF files into one — free

Drop two or more PDFs onto the tool, drag the rows to set the merge order, and click Merge & Download. Pages from each source PDF are copied into a single output document in your chosen order. Your files are uploaded over HTTPS and merged with pdf-lib on our secure server, then automatically deleted afterward.

You can reorder entire files (drag the row up or down), and you can remove a file from the merge with the trash icon. To reorder individual pages within a PDF, run it through our Organize PDF tool first, then merge.

Page content (text, images, fonts, hyperlinks within a page) is preserved exactly because pdf-lib copies pages atomically rather than re-rendering them. Document-level bookmarks and the table-of-contents are reset since the new file is a fresh document — re-add bookmarks with a desktop PDF editor if needed.

Each file can be up to 50MB and you can merge up to 20 PDFs at once. In practice, merging a handful of large books (500+ pages each) or hundreds of small reports works comfortably within that limit.

Yes — your PDFs are uploaded over an encrypted (HTTPS) connection, merged with pdf-lib on our secure server, and automatically deleted afterward; we never store or share them. If your policy strictly forbids any upload at all (e.g. some compliance workflows for contracts, NDAs or medical records), use a desktop PDF tool that runs fully offline instead.

If you know the password, decrypt first with our PDF Password tool, then merge. The merge tool calls ignoreEncryption when possible, but PDFs with strict encryption (printing/copying disabled) need to be unlocked first.

Slightly smaller because duplicate fonts and embedded resources are deduplicated during the merge. The difference is typically a few percent — significant only when you are merging many files that share the same font set (e.g. an entire branded report series).

Free with a generous daily allowance, no watermark on the output, no signup needed to try it. Each file can be up to 50MB and you can merge up to 20 PDFs at once.

Yes — each page keeps its own dimensions in the combined file because pdf-lib copies pages as-is rather than reflowing them. An A4 contract, a Letter-size invoice and a landscape spreadsheet can all sit in one PDF, each at its original size. Drag the rows to control which document comes first.

Yes, but with a different tool: Split PDF extracts a page range (e.g. 5-12) into its own file, and Organize PDF lets you delete or reorder pages in the merged result. Merge only joins files together, so reach for those sibling tools when you need to take a combined PDF apart again.

Yes — click "Add more" at any time before merging; new files are appended to the end of the list with their own thumbnail rendered automatically. Drag them, or use the up/down arrow buttons, into position relative to the files already there — you don't need to restart the order from scratch.

Yes — every file row has small up/down arrow buttons next to the drag handle that move it one position at a time, which is far more reliable than a drag gesture on a touchscreen. Tap them repeatedly to walk a file to the top or bottom of the merge order.