Merge PDF: instructions, examples and limits

What it does

Copies pages from each selected PDF into one new document, in the visible file order.

Merge is useful when a submission, handout or archive needs several existing PDFs in one deliberate file order.

How to use it

1. 1

   Select the PDFs in the order you want them to appear.

2. 2

   Review the file list and page counts before starting the local copy operation.

3. 3

   Download the merged file, reopen it and check the first and last pages before sending it onward.

How the result is produced

Copies pages from each selected PDF into one new document, in the visible file order.

Important limits

Local processing. Maximum 50 MB per input, 100 MB total, 20 files and 2,000 total pages. Encrypted or malformed PDFs are rejected. Select at least two files. Copying pages may omit form fields, outlines and other document-level features; merged output may invalidate digital signatures.

Checks before sharing or relying on the result

• Page content is copied locally, but form fields, outlines, attachments and other document-level features may not survive.
• Digital signatures can be invalidated by any merge operation.
• The original files are not changed and remain the source of truth.

Choosing the next step

Start with the least destructive operation that solves the job. Page organization preserves more of the source than raster compression; compression is useful for scans but can remove selectable text; flattened redaction removes the original object layer but requires you to mark every sensitive area yourself.