Merge PDF
Join several PDFs into a single document. Add the files, drag them into the order you want, and download the result — all of it inside your browser, so contracts, invoices, and medical records never travel to anyone's server. Pages keep their original size and orientation rather than being scaled to match each other.
PDF Tools
Private by default
This tool runs entirely in your browser. Your data is never uploaded to a server.
How it works
How the documents are joined
Each source is parsed, its pages are copied into a new document along with the fonts and images they reference, and the result is written out. Nothing is re-rendered or recompressed, so text stays selectable and images keep their original quality.
- Page order follows the list exactly, and every page of a document is taken — use the Split tool first to take only part of one.
- Resources shared between pages, such as an embedded font, are copied once rather than duplicated per page.
- The merged file is usually a little smaller than the inputs added together, because the overhead of a document structure is paid once.
- Metadata such as the title and author is not carried over: the combined document is a new one, and inheriting one source's author would be misleading.
For reference
What survives a merge
| Feature | Kept | Why |
|---|---|---|
| Page content and text | Yes | Pages are copied, not re-rendered |
| Images and fonts | Yes | Embedded resources travel with the page |
| Page size and rotation | Yes | Each page keeps its own |
| Bookmarks | No | Attached to the document, not the page |
| Form fields | No | Flatten the form first if the data matters |
| Digital signatures | No | A signature only certifies one exact file |
Text remains real text throughout — nothing here converts a page into an image, so the merged document is still searchable.
How to use
4 clear steps.
Add two or more PDFs — you can select several at once.
Use the arrows to put them in the order you want.
Check the page count for each document.
Click merge and the combined PDF downloads.
Good to know
Frequently asked questions
- Are my files uploaded anywhere?
- No. The merge runs in your browser using an open-source library, and no part of any document is transmitted. You can confirm it in your browser's network tab, or disconnect from the internet after the page loads and it will still work.
- What happens if the PDFs are different page sizes?
- Each page keeps its own size and orientation. A mix of A4 and Letter stays a mix, which is usually what you want — scaling pages to match would resize their content and shift any margins.
- Are bookmarks and form fields kept?
- No. Pages and their visible content are copied; bookmarks, form fields, and annotations attached to the document structure are not. If the form data matters, flatten the form before merging.
- What about digitally signed PDFs?
- The signature does not survive, and that is correct behaviour: a signature certifies one exact document, so it cannot honestly carry over to a different one that now contains other pages.
- Can it merge password-protected PDFs?
- Only if the password is the kind that restricts printing or editing rather than opening. A document that needs a password to open cannot be read without it, so decrypt it in a PDF reader first.