How to merge PDF files into one
- Drop your files on the box above (or click it to choose them) and put them in order with the ↑ and ↓ buttons.
- Check the settings below the box; the defaults suit most files.
- Press Convert. Long jobs show a progress bar and can be cancelled; you then see what was made and its real size.
- Download the .pdf file.
What is kept when you merge PDF files into one
- Every page of every file is copied in the order you set — page size, orientation, text, images, links on the page and form appearances included.
- Nothing is re-rendered or re-compressed, so the merged file looks exactly like the originals.
- Bookmarks (the outline) and fillable form fields of the separate files are not combined; the merged PDF has the pages, not each file’s outline. Encrypted files are refused.
Example
Merging the two sample files, in that order:
Input
sample.pdf — 3 pages, A4 portrait (440.0 KB)
sample-appendix.pdf — 2 pages, Letter portrait (56.6 KB)Output
merged.pdf — 5 pages (494.6 KB)
page 1: A4 portrait
page 2: A4 portrait
page 3: A4 portrait
page 4: Letter portrait
page 5: Letter portraitAbout PDF files
A PDF holds pages that look the same on every device: text with its fonts, vector drawings and images at fixed positions. Pages can be rotated, reordered or copied between files without redrawing them. It opens in any browser, Acrobat Reader, phone and tablet viewers.
Good to know
- A PDF that asks for a password when you open it cannot be processed here; protection is never removed.
Privacy and limits
The file is read and converted by this page in your browser; there is no upload and no account. Nothing inside a PDF is run: there is no PDF JavaScript engine on this page, and links and forms are copied, not followed. Encrypted PDFs are refused rather than unlocked. PDFs may have up to 2,000 pages. Files up to 150 MB are accepted; a file of the wrong type or a damaged file is rejected with the reason.