Merge PDF Files Into One Document
Merging PDFs means joining several files into one, with the pages in the order you choose. This tool does it in your browser: add your files, arrange them, and download a single PDF. Nothing is uploaded, because the work is done by code running on your own device.
When to Merge PDFs
- Monthly or quarterly reports that were exported one section at a time.
- Invoices and receipts you want to send as one attachment instead of ten.
- Scanned pages that a scanner saved as separate files.
- Screenshots exported to PDF, one image per file, that belong together as a single record.
Why Order Matters
Pages are added from the top of the list to the bottom, and each file keeps its own internal page order. Your browser may hand over a multi-file selection in alphabetical order rather than the order you clicked, so check the list before you merge. Move a file with the Up and Down buttons or drag its row. Numbering files 01, 02, 03 before you add them saves time on long lists.
Merging Scans and Screenshots
Scanners often save each sheet as its own PDF, and screenshot tools export one image per file. Merging them gives you a single document that is easier to email, print or archive. Check the thumbnails to confirm every page is the right way up before you merge, because rotation is not changed here. A merged scan is only as searchable as its parts: if the originals had no text layer, the combined file will not have one either.
What Is Kept and What May Not Be
Pages are copied into the new document as they are, without being re-rendered, so text stays selectable and images keep their quality. Some document-level features belong to the original file rather than to its pages, and those do not always survive.
| Item | After merging | Notes |
|---|---|---|
| Pages, text and images | Kept | Copied unchanged |
| Web links on pages | Kept | Links to other pages in the same file may stop working |
| Bookmarks (outline) | Not kept | Rebuild them in a PDF editor if needed |
| Form fields | May clash | Fields with the same name in different files can share or lose values |
| Password-protected files | Rejected | Remove the password first |
If your files contain forms, flatten them or fill them in before merging. If the document needs a table of contents with bookmarks, add them after the merge.
File Size After Merging
Because pages are copied rather than recompressed, the merged file is usually close to the combined size of the originals. A merge will not make a large PDF smaller. To keep the result small, shrink oversized images before they go into the PDF, or avoid including the same heavy file twice.
Privacy
Your files are read with your browser's File API and merged by JavaScript on your device. They are not sent to a server, and there is no account or file history. Once the page has loaded, you can switch off your connection and the merge still works. Close the tab and everything is gone.