Merge PDF
Combine two or more PDFs into one, with every page visible and drag-reorderable before you download.
Drop PDFs here
Drop two or more PDFs, or add more any time. Nothing is uploaded.
Drag a page to reorder it. Files merge in the order pages appear here.
Add PDFs on the left, drag pages into the order you want, then merge.
Everything here runs on your device. Nothing you enter is uploaded or stored.
Combine two or more PDF files into one, with every page from every file shown as a thumbnail you can drag into any order before merging. Runs entirely in your browser — the files are never uploaded to a server.
How to use it
- Drop two or more PDF files onto the page, or use the file picker to add them.
- Every page from every file appears as a thumbnail, in the order the files were added.
- Drag any page thumbnail to reposition it — you can move a page from one file to sit between pages of another.
- Press Merge and download to get one combined PDF in exactly the page order shown.
Why file-order merging is usually wrong
Most PDF mergers assume you want File A’s pages, then File B’s pages, then File C’s, in the order you selected the files. That is often right for stapled scans, but it breaks down the moment a real merge task involves interleaving — a signed cover page from one file needs to sit between the title page and body of another, or three single-page scans need to be woven into a specific sequence with an existing report.
This tool renders every page from every added file into one flat, drag-reorderable grid, so any page from any file can be moved anywhere in the final sequence. The output document’s page order is exactly what you see on screen when you press merge — there is no hidden file-grouping logic underneath it.
What happens to the pages during a merge
Merging copies each page’s content directly from the source document into a new one, using the same object-copying mechanism a PDF viewer itself would use to display the page. Nothing is re-rendered or re-encoded, so embedded fonts, vector graphics, and any existing page rotation all survive the merge exactly as they were in the source file. The one thing this means practically: if a source PDF was already large because of embedded high-resolution images, the merged file inherits that size rather than compressing it — for that, see the Compress PDF tool afterward.
What it does not do
It does not merge encrypted PDFs that are password-protected — remove the password first, using PDF Unlock if you have permission to do so. It does not deduplicate identical pages across files; if two files happen to share a page, both copies appear and must be removed manually by dragging one off (delete with the × on its thumbnail). It has no per-file page range selection at the point of adding a file — every page from every added PDF appears, and any pages you do not want are removed from the grid before merging.
Common merge scenarios
| Scenario | Approach |
|---|---|
| Combine several single-page scans into one document | Add all scans, check order, merge |
| Insert a cover page in front of an existing report | Add both files, drag the cover page to the front |
| Combine three chapters submitted as separate PDFs | Add all three in the desired chapter order |
| Merge a signed signature page into the middle of a contract | Add both files, drag the signed page into position |
File size after merging
| Merge size | Typical result |
|---|---|
| A few text-heavy documents | Combined size close to the sum of originals |
| Documents with large embedded images | Combined size close to the sum; consider compressing after |
| Many small single-page scans | Combined size roughly the sum, plus a small fixed overhead per document |
Questions
Is there a limit on how many PDFs I can merge?
No fixed limit is enforced by this tool, though very large numbers of files or very large documents are bounded by your device's available memory, since everything is processed in the browser rather than on a server.
Are my files uploaded anywhere?
No. Every PDF you add is read and merged locally in your browser using JavaScript. Nothing is sent to a server — which matters if the documents are confidential, unpublished, or contain anything you would not paste into a random web form.
Can I merge pages out of their original file order?
Yes. Every page from every added file lands in one drag-reorderable grid, so you can move a page from the second file to appear before a page from the first, or interleave pages from three files however you need.
Does merging preserve the original page size and orientation?
Yes. Pages keep their original dimensions and any rotation they already had. Merging does not resize, crop, or re-encode page content — it copies the pages as they are into a new document.
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