How to merge PDF files
- Select Choose files or drop two or more PDFs on the box. You can add more later.
- Put them in order with the Up and Down buttons next to each file. The first file becomes the first pages of the result.
- Leave Add a bookmark for each file on if you want a clickable outline in the finished PDF.
- Select Merge, then Download merged.pdf.
What you get
One PDF that contains every page of every file, in the order shown in the list. Pages keep their original size, orientation and rotation, so a landscape slide deck and a portrait contract can sit in the same document. Text stays selectable and links inside each source file keep working, because pages are copied as they are and not turned into pictures. The file is produced by the pdf-lib library, and it opens in Preview, Acrobat, Chrome, Firefox and every phone reader.
Good uses
Joining the pages of a loan or visa application, adding a signed page to a contract, putting an invoice and its receipts in one attachment, building one study pack from lecture notes, or assembling a portfolio. Most online forms accept only one file, which is where merging helps most.
Tips
- Photos and scans first become PDFs with Images to PDF, and then merge with the rest.
- Drop pages you do not need before merging with Delete PDF pages, or after merging if you change your mind.
- Number the whole document afterwards with Add page numbers to PDF, so the numbers run through all the parts.
- A scan that came out sideways can be fixed with Rotate PDF.
- To go the other way, use Split PDF.
About bookmarks
A bookmark is an entry in the outline panel that most readers show at the side of the document. This tool writes one top-level bookmark per merged file, named after the file without its extension, pointing at that file’s first page. Source files that already had their own bookmarks do not carry them across, so the outline stays short and predictable. Turn the option off if you want a plain PDF with no outline.
Everything happens on your device. Your documents are never uploaded, which makes this safe for contracts, IDs and medical papers.