Merge PDF - Combine Multiple PDFs 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. No upload — the merge happens entirely in your browser with pdf-lib.

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.

There is no fixed cap — the limit is your browser's memory. In practice, merging a handful of large books (500+ pages each) or hundreds of small reports works without issue on a modern laptop. Phones handle smaller jobs comfortably.

No — pdf-lib runs entirely in your browser, so the merge happens locally. This is essential for confidential PDFs like contracts, NDAs, medical records, and financial statements where uploading to a third-party server is a compliance violation.

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, unlimited use, no watermark on the output, no signup. The page count and file count are limited only by your browser.