What this does
Combines two or more PDF files into a single document, in the order you
choose, and downloads it as merged.pdf. Nothing is uploaded:
the files are read, stitched together, and written back out by your
browser. That makes it a safe choice for contracts, bank statements,
medical paperwork, and anything else you would rather not hand to a
server.
Typical jobs: bundling a month of invoices into one file for accounting, reassembling a scan that came out as one PDF per page, putting a cover letter in front of a CV, or building a single application packet out of a form, an ID scan, and a supporting letter.
How do I merge PDF files?
- Click the file picker and select every PDF you want to combine. You can add more in a second round; new files are appended to the list.
- Drag rows to reorder. The two-digit number on each row is that file's position in the output. Use the × button to drop a file you added by mistake.
- Press Merge & download. Pages are copied in list order, every page of the first file, then every page of the second, and so on.
Mixed page sizes and orientations are fine. An A4 portrait letter followed by a landscape US-letter spreadsheet stays exactly that; nothing is scaled or rotated to match.
Does merging change the quality of my PDFs?
No. Pages are copied as complete objects, so text stays text, vector graphics stay vectors, and embedded images keep their original resolution and compression. This is not a print-to-PDF or rasterise step. The output is written with object streams enabled, which usually makes the merged file a little smaller than the sum of its parts because shared structure is written once. If the result is still too large to email, run it through the PDF compressor afterwards.
What happens to bookmarks, links, and form fields?
Page content and the annotations that live on a page (highlights, links drawn on the page, comments) come across. Document-level structure does not: the outline panel of bookmarks, document metadata such as title and author, and interactive form definitions are not carried into the merged file, so a fillable form will render as a flat page. If you need to keep form fields live, merge in the application that created the form instead.
Can I merge password-protected PDFs?
Only if the password restricts editing rather than opening. A PDF you can open without typing a password is usually fine even when it reports itself as "secured"; the merger opens it in a mode that ignores those permission flags. A PDF that asks for a password before it will display anything is encrypted, and its pages cannot be read without the key. Unlock it first in a PDF viewer (open it, enter the password, and print or save a copy), then merge the copy.
Is there a limit on the number or size of files?
There is no fixed cap on the count. The practical limit is your device's memory, because every file is held in RAM while the merged document is assembled. Combining a few hundred pages of ordinary office documents is quick on any laptop or phone. Very large scanned PDFs, where each page is a multi-megabyte image, add up fastest; if a merge fails on a phone, try it on a desktop browser or split the job into two merges.