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Merge PDF Files Online

Merging joins several PDFs end to end into one file. It is the tool people reach for most often after scanning, because a document that arrived as twelve separate captures needs to become one record before it is filed.

How to Merge PDF Files Online

  1. Add every PDF you want to combine.
  2. Drag the files into the order you want them to appear.
  3. Merge, then download the single combined PDF.

When you would use this

  • Reassembling a scanned file that came off the scanner as one PDF per batch.
  • Joining a covering letter, an invoice and its annexures into one document before emailing it.
  • Combining monthly statements into a single yearly file for archiving.

Things to watch for

Page order is decided before you merge, not after

Files are joined in the order shown, so arrange them first. If a merged file comes out in the wrong sequence, Organize Pages will fix it without re-merging.

Encrypted files have to be unlocked first

A password-protected PDF cannot be merged while it is encrypted. Run Remove Password on it first, then merge.

Bookmarks do not always survive

Some merges drop the bookmarks from the source files. If the combined document needs navigation, rebuild it with Edit Table of Contents afterwards.

Form fields with the same name collide

If two source PDFs both contain a field called 'name', the merged file can behave oddly. Flatten each form before merging if the answers are already final.

Choosing the right tool

Merging is not the only way to combine documents. If you only need a few pages from each source, Extract Pages first and merge the extracts - the result is smaller and easier to read. If the two documents should sit on top of each other rather than one after another, for example content onto a letterhead, use Overlay PDFs instead. And if you are combining images rather than PDFs, Image to PDF does it in one step without a separate merge.

Questions

Is there a limit on how many PDFs I can merge?

There is no fixed count. Very large jobs are limited by your device's memory rather than by the tool, so merging a few hundred small files is normally fine while a handful of very large scans may be slower.

Does merging reduce the quality of the pages?

No. Merging copies each page across as it is. Nothing is re-compressed, so text stays selectable and scans keep their original resolution.

Can I merge PDFs that have passwords on them?

Not directly. Remove the password first, then merge.

Does merging reduce quality?

No. Pages are copied across unchanged, so text stays selectable and scans keep their original resolution. Nothing is re-compressed.

Can I merge a PDF with a Word document?

Not directly. Convert the Word file with Convert File to PDF first, then merge the two PDFs.

What order will my files be merged in?

The order shown before you press merge. Sort by name or by date if that matches the sequence you want, or drag them manually.

Is there a size limit?

Large jobs are limited by your device's memory rather than a fixed cap. If a merge fails on a very large batch, merge in groups and then merge the groups.

Need this at scale?

These tools handle one document at a time. When the job is thousands of files, Greenbooks handles document digitization as a managed service, including bulk scanning, OCR and metadata capture, with the output loaded into DocuVenta DMS. Talk to us about volume work.

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