Online Tool Store
PDF Merger
Merge PDFs into one document — drag to reorder or rotate any file first. Runs entirely in your browser, so your files are never uploaded.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
You can add more files later — each new selection is appended to the list.
No files yet — choose some PDFs to get started.
How it works
- Choose two or more PDFs. They stay on your device — each one is read locally so its page count can be shown.
- Put them in the order you want by dragging a row, or with the ↑ and ↓ buttons, and drop any you don't need with ✕. Use ↻ to rotate a file's pages 90° at a time before merging.
- Press "Merge PDFs". The combined file downloads as
merged.pdf.
What merging actually does to the file
A PDF is a collection of numbered page objects plus a table saying where each one lives in the file. Merging doesn't redraw anything: each page object is copied into a new document and the table is rebuilt, so the total page count is simply
merged pages = pages(file 1) + pages(file 2) + … + pages(file n)
Because the page contents are copied rather than re-rendered, text stays selectable and searchable and images keep their original resolution — a merged file is normally close to the sum of the input sizes, minus any duplicate fonts that get shared. It also means merging is lossless: doing it twice from the same originals gives you the same pages both times.
FAQ
Are my PDFs uploaded anywhere?
No. Every file is read and combined inside your own browser, so nothing is uploaded, stored, or logged. Once the page has loaded you can go offline and it will still merge.
Can I change the order of the files?
Yes — drag a row to a new position, or use the ↑ and ↓ buttons, which also work by keyboard. The numbered order in the list is exactly the order the pages appear in the merged file.
Can I rotate a file before merging it?
Yes — the ↻ button rotates a file 90° at a time (90°, 180°, 270°, back to 0°). It rotates every page of that file and is applied on top of any rotation the pages already had, so an already-rotated scan keeps its orientation rather than being reset.
Can I add more files after the first selection?
Yes. Choosing files again appends them to the end of the list rather than replacing it, so you can build up the document from several folders. Use ✕ to drop any single file, or "Clear all" to start over.
Why was one of my files skipped?
A file is skipped if it isn't really a PDF, or if it's password-protected or damaged — the error message names it and says which. Open a protected PDF in a reader, save an unlocked copy, then add that copy instead.
Does merging reduce the quality of the pages?
No. Pages are copied across as-is, with their existing text, vectors, and images intact — nothing is re-rendered or re-compressed, so the merged file looks identical to the originals.
What happens to form fields, links, and bookmarks?
Page content, internal links, and annotations come across, but document-level structures — the bookmark outline, and form fields shared across a document — are not carried into the merged file. If those matter, keep the original alongside the merged copy.
How we compare
| Feature | Online Tool Store | Upload-based PDF sites | Acrobat / desktop apps |
|---|---|---|---|
| Your files never leave your device | ✓ | ✗ | ✓ |
| No sign-up, no daily merge limit | ✓ | Varies — free tiers usually cap merges per day | Paid licence |
| Reorder files before merging | ✓ | ✓ | ✓ |
| Page counts shown before you commit | ✓ | Sometimes, after upload finishes | ✓ |
| Drag and drop to reorder files | ✓ | ✓ | ✓ |
| Rotate a file's pages before merging | ✓ | ✓ | ✓ |
Merging is the one PDF job people most often hand to a random website, usually with contracts, invoices, or scans of ID attached — the whole point of doing it here is that those files stay in your tab. It works at the whole-file level, so if you need to shuffle or delete individual pages inside a document, a desktop editor is still the better tool.