About this merge pdf
Combine separate PDFs into one document for an application, a submission or a handoff. Add your files, put them in order with the up and down controls, and every page of the first follows into the second and so on. The whole thing happens in a browser worker and the finished PDF downloads straight to your device — nothing is uploaded, which is the part that matters when the files are contracts, statements or anything with a signature on it. The original files are left untouched.
How the merge pdf works
A new PDF is created and pages are copied from each source document in the displayed file order. The page-count limit is checked before pages are added. Processing can be canceled or times out after 45 seconds.
Merge PDF examples
A 2-page PDF followed by a 3-page PDF
One 5-page PDF
Move file B above file A
Pages from B appear before pages from A
Limitations & privacy
Two to ten files, up to 20 MB each, 30 MB combined, and 200 total pages. Password-protected or damaged PDFs are not supported. Bookmarks, signatures, forms, attachments, and document-level features may not survive. This is not a PDF security sanitizer. Review the downloaded result before sharing.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
Merge PDF: frequently asked questions
How do I merge PDF files?
Add two or more PDFs, drag or use the arrows to set the order, and download the combined file. Nothing is installed and the originals are not modified.
Can I change the order?
Yes. The up and down controls move a file in the list, and pages come out in exactly the order shown.
Does merging shrink the files?
No. Pages are copied across as they are, so the result is roughly the sum of the inputs. Compressing a PDF is a separate job this does not do.
Are signed PDFs still signed afterward?
No. Rewriting the file invalidates a digital signature, as it would in any tool that rebuilds the document. If the signature matters, merge before signing rather than after.
What happens to bookmarks and form fields?
They may not survive. Pages are copied; document-level features such as bookmarks, forms, attachments and annotations can be lost. Check the downloaded file before sending it.
Are my files uploaded?
No. A worker in your browser reads and rebuilds them on your device.
Updated October 19, 2026