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How To Merge Multiple PDF Files Into One Online or Offline


Below we show how to merge multiple PDF files into one document.

Step 1: Upload your files

Files are uploaded over an encrypted connection. They stay safe and private. Once merged, they are deleted.

Rather not upload your files and work with them on premise?
Use Sejda Desktop. Offers same features as the online service, and the files are processed locally.

Click Upload PDF files and select files from your local computer. Folders can be selected as well.

Dragging and dropping files to the page also works.

Tip: Dropbox or Google Drive files

You can pick PDF files from Dropbox or Google Drive too.

Expand the Upload PDF files dropdown and select your files.

Step 2: Reorder your files

Drag and drop the files to change the merge order.

Most times the files should be merged in alphabetical order. Use the sort buttons to sort A-Z or Z-A

Ready to merge your files? Let's go!

Merge PDF files online

Tip: Double sided printing

Files with even number of pages break double sided printing of the merged PDF file.

To print well double sided, a blank page can be inserted at the end of files with even pages.

Select the Double sided printing option.

Tip: Don't include all pages from a file

Click More options, then select the Include only specific page ranges option. Specify per file which pages you want. Leave blank to include all pages.

Tip: Handling bookmarks (the outline)

You can customize how the PDF file outline will be merged. There are four scenarios to choose from:

  1. Discard all bookmarks when merging PDF files
  2. Keep all existing bookmarks when merging PDF files:
  3. Create one bookmark per file when merging PDF files. Discard any existing bookmarks in the merged PDF files:
  4. Create one bookmark per file when merging PDF files. Keep all existing bookmarks, in the merged PDF files, adding them underneath the one bookmark per file:

Tip: How to add filenames in page footer when merging PDFs

You would like each page from the merged PDF file to have the original filename in the footer.

Click More options, then select the Add filename to page footer option.

Tip: Generating a Table of Contents for your merged PDF file

You would like to have the first page as a Table of Contents, with clickable links that navigate easily to the starting page of each merged file.

You can choose between using the filenames or the document titles in the Table of Contents.

Click More options, then select the Based on file names or Based on document titles options in the Table of Contents section.

Tip: Flattening PDF Form Fields

Your PDF files contain Acro Forms. You'd like to flatten the form fields so that the filled in values remain visible in the document but the fields are no longer editable.

Click More options, then select the Flatten option in Form Fields section.

If more of your merged files contain PDF forms, then you might be interested in either merging the form fields or discarding the fields completely from the result. Both options are available, including a merge flavour which preserves duplicate fields by renaming them.

Tip: Reordering or alternating pages

Need to reorder the pages of the merged file? Have a look at Visually combine and reorder PDF

Want mixed pages that alternate between the two files? See Alternate & Mix PDF

Step 3: Download results

Click Download to save the merged PDF file to your computer.

For peace of mind, delete your files. Click the Delete files button.

Tip: Save to dropbox

You can save the merged file to Dropbox. Expand the Download dropdown and choose Save to Dropbox

Ready to merge your files? Let's go!

Merge PDF files online

Over to You!

Do you have additional tips? We would love to hear them in the comments section.


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