Merge PDF
Combine two or more PDFs into one. Drag files to set the order, or sort by name.
What Merge PDF does
Merge PDF combines two or more PDFs into one file. Drag the files into the order you want, or sort them by name, then download a single PDF with all their pages.
How to merge PDF files
- Drop two or more PDFs on the box above. You can add more files later.
- Drag the thumbnails into order, or select Sort A→Z. Remove any file you don't need.
- Change the output file name if you like, then select Merge.
Options
| Order | Drag files into place, or Sort A→Z. Numbers sort naturally, so file 2 comes before file 10. |
|---|---|
| Output file name | merged.pdf unless you change it. The name is also written into the PDF as its title. |
| Summary | File count, total pages and total size are shown before you merge. |
Limits
- Each file gets one bookmark in the merged PDF, with its own bookmarks nested under it.
- Merge works on whole files. To move, rotate or delete single pages, use Organize pages on the result.
Where your file goes
Merging runs in this browser tab with pdf-lib. Your PDFs aren't uploaded. Password-protected files are unlocked in the tab after you type the password.
If you're signed in, the result panel also offers Save to My documents. Only that button uploads the file, to your account's storage.
Questions
How many PDFs can I merge?
Two or more. The tool has no file count limit; all files are held in this tab while you work, so the practical limit is your device's memory.
Can I merge password-protected PDFs?
Yes, if you know the password. You're asked for it when you add the file. Files that only restrict printing or copying open without one. The merged PDF has no password; use Protect PDF if it needs one.
Will the merged file have a watermark?
No. Nothing is added to your pages. The file's Producer field is set to DocumentCloud.ai; the other properties come from the first file.
Can I reorder pages instead of whole files?
Not in Merge. Merge first, then open the result in Organize pages to move, rotate, duplicate or delete single pages.
Do form fields still work after merging?
Yes. The fields of all files are combined into one form. If two files use the same field name, one is renamed so each keeps its own value.
Are bookmarks kept?
Yes. Each file becomes one bookmark named after it, with that file's own bookmarks nested underneath. Page labels and attached files are kept too.