Merge PDF
Combine multiple PDF files in the selected order, entirely in your browser.
How to use
Choose two or more PDF files. Select them all in the same dialogue (choosing again replaces the list). They appear in the order your browser lists them; use the ↑ and ↓ buttons to change the order and × to drop a file. Merge PDFs copies every page of the first file, then every page of the second, and so on, into one new document called merged.pdf. The result shows how many files and pages went in and the size of the new file.
Each page keeps its own size and orientation, so an A4 report and a US Letter form can sit in the same PDF without being resized. Text stays text: it remains selectable and searchable, and images are copied without being compressed again.
Because the pages are copied into a new document, a few things that belong to the document rather than to a page are lost: bookmarks, links that jump to another page of the same file, and the title, author and other document information. Links to websites keep working. Fillable forms keep the values you can see, but the fields may stop working, and a digital signature is no longer valid in the merged copy. Keep the originals if any of these matter.
Each PDF can be up to 80 MB, and all of them together up to 150 MB. Password-protected files are rejected, including files that open without a password but restrict printing or copying, because those are encrypted too. Everything happens in your browser; the files are not uploaded.
Example
part-1.pdf (3 pages) + part-2.pdf (5 pages) → merged.pdfAn 8-page PDF: pages 1–3 come from part-1.pdf and pages 4–8 from part-2.pdf.A4 report + US Letter formBoth page sizes are kept as they are in the merged file.cover.pdf moved to the top with ↑The cover's pages come first, whatever order the files were selected in.
Frequently asked questions
Are my documents uploaded?
No. Reading, editing and creating the output happen locally on this device.
Can I use a password-protected PDF?
No. Unlock the document with an authorised application before using this tool.
Why are the bookmarks missing from the merged file?
Bookmarks belong to a document, not to its pages, and only the pages are copied. If you need them, merge with software that rebuilds the bookmarks, or keep the originals for navigation.
Can I merge only some pages of a file?
Not in one step. Use Extract PDF pages first to make a copy with just the pages you need, then merge that copy.