Combine multiple PDFs into one

Drop every PDF you want to combine into the workspace — two files or twenty. The file list shows each document with its page count, so you can confirm order before anything is produced. Drag files into the sequence they should appear in the final document: cover first, then body, then appendices.

Press merge and the files are concatenated in browser memory using a client-side PDF library. Pages keep their original content exactly — text stays selectable and vector-crisp, images keep their resolution, and embedded fonts travel with their pages. Preview the result, then download the single combined file. Nothing is uploaded at any point, which makes this suitable for contracts, financial records, and medical documents that cannot leave your device.

Ordering mistakes are the most common merge problem, and they are invisible until someone reads the document. Check three things before merging: the logical sequence of files (not the order they arrived by email), the page counts (the merged total should equal the exact sum of the parts), and the orientation of each page (fix rotated pages with the rotate tool before merging — it is much harder to spot afterwards).

If the same files will be combined repeatedly — monthly invoices, weekly reports, recurring chapter exports — note the working order somewhere reusable. The merge itself takes seconds; reconstructing which of eight similarly named PDFs came first is what actually costs time.

If the combined file will exceed email attachment limits (typically 20–25 MB), merge and then compress, or send the files separately — a bounced message wastes more time than the tidiness of one file is worth. If different recipients should see different parts, keep the documents separate rather than distributing one file with sensitive pages someone should not have.

Documents still in active review are also better left unmerged: separate drafts are easy to swap, while a merged file has to be un-merged to replace a single page. Treat merging as the final step of a document workflow, not an organizing one.