Merging PDFs brings existing pages into a single file. It is useful for combining a cover letter with supporting documents or keeping related invoices together. It does not rewrite page content or make all source pages the same paper size. Plan the reading order before selecting files so the final document has a clear beginning and end.
Step-by-step guide
- Collect at least two PDFs and open each one to confirm it is the intended document.
- Check the file-count, total upload and PDF-page limits on Merge PDF. Your account tier and the tool can impose different bounds.
- Select the PDFs in the intended sequence and inspect the selected-file list before starting.
- Run the merge, wait for completion and download the combined PDF.
- Open the download and inspect the boundaries between source documents as well as the first and last pages.
Practical tips and limitations
Different page dimensions can remain different in the merged output. If a source contains a blank or duplicate page, review whether it belongs before combining the files. A digital signature may no longer validate after document changes; keep signed originals and avoid treating a merged copy as proof that their signatures remain valid. Password-protected, damaged or unsupported PDFs can be refused. Use smaller groups if your full batch exceeds a displayed limit.
Frequently asked questions
How many files do I need?
Merge PDF needs at least two files. The maximum depends on your effective allowance.
Does merging compress the document?
Merging combines pages. For a smaller attachment, separately evaluate Compress PDF afterward.
Can I extract a section first?
Use Split PDF for supported page selections, check its output, then merge the needed documents.
Related tools and guides
Check Usage limits for current tier allowances. Individual tools and server safety limits can be lower.