# PDF Merge

Combine up to 20 PDF files into one document with our PDF Merge tool. The pages follow the order of your uploads, and the bookmarks, internal links, form fields and attachments of every file come along. Password-protected files open with the password you enter. A quick way for office workers, students and anyone who sends documents to join reports, scans, invoices and chapters into a single file.

## Frequently asked questions

### How do I merge PDF files?

Upload two or more PDF files and click Merge PDFs. The tool appends the pages of each file to one new document and offers it as merged.pdf to download.

### In which order are the files merged?

The files are merged in the order you upload them: every page of the first file, then every page of the second, and so on. To change the order, upload the files again in the order you want.

### How many files and pages can I merge?

You can merge up to 20 files of at most 10 MB each and 20 MB together. The merged document can have at most 200 pages, and a merge that would pass that is refused before the merged file is built.

### Are bookmarks kept?

Yes. The bookmarks of every file are kept with their nesting and follow one another in upload order. Each bookmark still opens its page in the merged document.

### What happens to links and form fields?

Links inside a file keep pointing to the right page, and web links stay as they are. Form fields stay fillable with their values; when two files use the same field name, the later field is renamed with a suffix such as _2 so the fields do not overwrite each other.

### Can I merge password-protected PDFs?

Yes, enter the password and it is tried on every protected file, so this works when the protected files share one password. Files that only restrict printing or copying open without one. The merged file itself is saved without a password.

### Which document details does the merged file get?

The title, author, subject, keywords and dates come from the first file, along with its page layout and viewer settings. Attachments embedded in any of the files are all kept.

### What is not carried over?

Accessibility tags, page labels, document-level JavaScript and XFA form data are not carried over. Digital signatures no longer validate, because merging changes the signed bytes.

### Does merging lower the quality?

No. Pages are copied as they are, with their text, vector graphics, fonts and images unchanged. Nothing is rasterized or recompressed.

### Are my files stored?

No. The files are merged in memory for this request and the result is returned directly. Nothing is written to storage on the server.

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