PDF Merge
Combine multiple PDF files into one, right in your browser.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Drop two or more PDFs here or click to upload (merged in the order selected)
What this tool does
Combines two or more PDF files into a single PDF, with every page from each source file copied in, in the order you added the files.
How to use it
Drop or select two or more PDF files at once — order matters, since pages are copied file by file in the order you select or drop them. Once processing finishes, download the single merged PDF.
Worked example
Uploading report-part1.pdf (3 pages) followed by report-part2.pdf (2 pages) produces one merged.pdf with 5 pages total: the 3 pages from part 1 first, then the 2 pages from part 2, in their original internal order.
How merging works
Each source file is copied into a fresh PDF document using pdf-lib's copyPages, preserving every page exactly as it appeared in the source, including its own page size — pages from different source files can end up at different sizes within the same merged document if the originals differed.
Limitations
Only whole documents can be merged — there's no way to select specific pages from a source file before merging, or to interleave pages from different files; use the PDF Split tool first if you need to extract specific pages. The order can only be set by the order you pick the files, since there's no drag-to-reorder step after selecting them.
What happens with encrypted PDFs
The tool doesn't reject an encrypted file outright with a clear warning — it attempts to load it anyway. But pdf-lib has no ability to actually decrypt password-protected content streams, so merging a genuinely encrypted source file can produce a corrupted result, blank pages for that file, or a generic error partway through, rather than a clean rejection up front. Remove any password protection with a dedicated tool before merging.
Privacy and processing
The entire merge runs locally in your browser using the pdf-lib library. Your files are never uploaded to a server.
Frequently Asked Questions
- Are my PDFs uploaded to a server?
- No, merging happens entirely in your browser using pdf-lib — your files never leave your device.
- In what order are the PDFs merged?
- In the order you select or drop the files, from first to last.
- Does this work with password-protected PDFs?
- Not reliably — the tool doesn't refuse an encrypted file upfront, but pdf-lib can't actually decrypt protected content, so a genuinely password-protected source file can produce blank pages, a corrupted result, or an error partway through. Remove the password first with a dedicated tool.