How to merge PDFs
- Choose Merge files, then add PDFs and images by choosing them or dropping them on the box.
- Put them in order with the Up and Down buttons.
- To use only some pages of a PDF, type them in its Pages box, for example
1-3, 6. - Press Merge files, then download the result.
Images become one page each, which makes this a quick way to turn photos or scans into a single PDF. ChooseSame as image to make each page the size of its picture, or A4 orUS Letter to centre each picture on a printable page. Pages turn to landscape for wide images, and photos are shown the right way up using the orientation recorded by the camera.
How to split, extract or reorder pages
- Choose Split and organise a PDF and add one PDF. Its number of pages is shown.
- To make one new PDF, choose Extract, reorder or rotate pages and list the pages you want in the order you want them. Pages you leave out are removed.
- To make several PDFs, choose Split into separate files: one per page, one for every few pages, or one for each range you type. Several files are downloaded together as a ZIP.
Writing page numbers
| You type | You get |
|---|---|
1-3, 7, 5 | Pages 1, 2, 3, 7 and 5, in that order |
4-end or 4- | Page 4 to the last page |
end-1 | Every page in reverse order |
odd, even | Odd or even pages, useful for double-sided scans |
1, 1, 2 | Page 1 twice, then page 2 |
Page numbers always mean the position in the file, starting at 1, even if the document prints different numbers on its pages.
Rotating pages
Rotation turns the page in the file, not just on screen, so it stays turned in every PDF reader. To fix one sideways page, keep all pages, choose a rotation and type that page’s number in Rotate only these pages.
Limitations
- There are no page previews. Previews would need a much larger PDF renderer; check the page count and the result instead.
- Bookmarks (the outline), document properties such as title and author, and links between files are not copied.
- Fillable forms with the same field names in different files can clash when merged. Fill in and save, or flatten, forms first.
- Digital signatures are no longer valid in the new file, because changing a signed document invalidates its signature.
- Password-protected and edit-restricted PDFs must be unlocked first (see below).
- Everything happens in your browser’s memory, so very large jobs can be slow, especially on phones. Limits: 100MB per PDF, 50 MB per image, 250 MB in total, 50 files and 2000pages in one result.
Frequently asked questions
Are my PDFs uploaded?
No. Your files are read and combined by JavaScript running in this browser tab, and the result is saved straight to your device. Nothing is sent to a server, which is why there is no upload progress bar and no waiting for a download. That makes the tool suitable for contracts, statements and other private documents.
Will merging reduce the quality of my PDF?
No. Pages are copied as they are, including their text, vector graphics, fonts and images, so text stays sharp and searchable. Images you add are placed in the PDF without being re-compressed, except for formats PDF cannot hold directly (such as WebP and GIF), which are converted to lossless PNG.
Why can’t I open a password-protected PDF?
Pages in an encrypted PDF can only be copied after the encryption is removed. If you know the password, open the file in a PDF reader and print or save it as a new PDF without a password, then use that copy here. The same applies to PDFs that open without a password but forbid editing.
Why is my merged PDF bigger or smaller than the originals added together?
Shared resources such as fonts can be stored once instead of in every file, which often makes the result smaller. It can be slightly larger when the originals used compression features that are rebuilt differently, or when you include some pages more than once.