Merge PDF
In your browser, no upload
pages copied · not re-encoded
Specification
6 rows| Item | Value | Notes |
|---|---|---|
| Input | Read from the file itself, not its name | |
| Output | One PDF | Every page of every file, in one document |
| Order | The order you pick them | Add files again to put more at the end |
| Page content | Untouched | Copied as stored — nothing is decoded or drawn again |
| File size | Whatever this device holds | The file is read in this tab; it is never sent anywhere |
| Processed in | This browser | Not sent to a server |
What happens
4What happens, and why
Drop two or more PDFs and they become one document, in the order you picked them. The result is built as soon as the list changes, so there is no button to press and no settings screen: pick, look at the row for each file, download.
Nothing in the pages is decoded. A PDF page is a stream of drawing instructions together with the fonts and images it refers to, and joining files means copying those objects into a new document and writing a fresh index — the table that says where each object is — around them. The bytes that draw your pages are the bytes that were in the files you dropped, which is why the badge says the file was not re-encoded and why a hundred-page report joins in about as long as it takes to read it from disk.
What a new document cannot bring along is the old ones’ bookmarks. An outline is a tree of links into one particular file’s objects; there is no such tree in a document that did not exist a moment ago, so the joined file has none. Interactive form fields come across as the boxes you see but stop being a form, for the same reason. Page content, links inside a page, and the page size and rotation of each page are all kept.
The files stay on your device. They are read in this tab, joined here, and the result is handed to your browser’s downloads — none of it is sent anywhere, so a contract or a medical report is as private here as it is in the folder it came from.
FAQ
5Does it lower the quality
No, and it cannot: nothing in the pages is decoded. A page in a PDF is a list of drawing instructions plus the fonts and images it uses, and all of that is carried over exactly as it was stored, compression and all. A scan stays the scan it was, at the size it was.
What order do the pages come out in
The order you added the files, and within a file its own page order. Not the file names, not the dates. Add the files one at a time if you want to be sure, or start over and pick them again in the order you want.
Are bookmarks and links kept
Links drawn inside a page are kept, because they are part of the page. The document outline — the bookmark tree a reader shows in its sidebar — is not: it belongs to the file it came from and cannot be carried into a new document. If the outline matters more than joining does, keep the files apart.
Can it join a password-protected PDF
No. A protected file’s pages are encrypted, so copying them would copy nothing readable. The file is refused with a message rather than joined into something broken. Open it in a reader, save an unprotected copy, and join that.
Is the PDF uploaded
No. The browser reads the file from your disk and writes the new one on this page. There is no upload endpoint on this site, so there is nowhere for the file to go. Nothing about the document is logged either — this page does not know how many pages your file has.