Knowing how to merge multiple PDFs into a single document saves time and keeps your files organized. Whether you are combining monthly invoices into a yearly summary, assembling a report from separate chapters, or bundling contract pages that were scanned individually, merging is one of the most practical PDF operations.
Common use cases
- Invoices and receipts — consolidate a month or quarter of invoices into one file for bookkeeping or tax filing.
- Reports and proposals — combine a cover page, table of contents, body, and appendices that were created in different applications.
- Legal documents — merge contracts, addendums, and signature pages into a single binding document.
- Scanned documents — if your scanner produces one PDF per page, merge them into a complete multi-page document.
How merging works
The Merge PDF tool takes up to 10 PDF files and combines them in the order you specify. Each file is appended page by page — fonts, images, links, and bookmarks are preserved as-is. The result is a standard PDF that looks exactly like the originals placed one after another.
File order matters
The order you add files determines the page order in the final document. Before merging, arrange your files in the sequence you want. If you need to rearrange individual pages after merging — for example, moving an appendix before the conclusion — use the Reorder Pages tool on the merged result.
Limits to keep in mind
There are a few practical limits when merging PDFs:
- Maximum 10 files per merge operation. If you have more, merge in batches — combine the first 10, then merge that result with the next batch.
- Total size cap of 150 MB across all files combined. Individual files can be up to 50 MB each.
- Page limit of 5,000 pages total. This is generous enough for virtually any real-world use case.
Quality preservation
Merging does not re-encode or compress your content. Images stay at their original resolution, text remains vector, and fonts are kept intact. The merged file size will be approximately the sum of the individual files, sometimes slightly less due to shared font deduplication.
What about encrypted PDFs?
Password-protected PDFs need to be unlocked before merging. If one of your files requires a password, use the Password tool to remove the protection first, then add the unlocked file to your merge batch.
After merging
Once your files are combined, you can continue working with the result directly. Common follow-up steps include compressing the merged file if it is too large for email, or adding a watermark for branding. The tool lets you chain to other tools without re-uploading the file.