How to use Merge PDF
- Click “Select PDF files” or drop two or more PDFs onto the box.
- Drag the files (or use the arrows) to put them in the right order. Add more files any time.
- Click “Merge PDF” and download your combined document.
Combine PDFs without uploading them
Merging is one of the most common PDF tasks: joining scanned pages, putting a cover letter in front of a CV, or collecting monthly invoices into a single file for your accountant. bopdf copies every page of every file into a new PDF directly in your browser, so the original quality is kept exactly — text stays selectable, links and vector graphics remain sharp, and nothing is re-compressed.
Tips for a clean result
- Files are merged top to bottom, so put the cover or first chapter at the top of the list.
- Need only some pages from a file? Use Split PDF first, or reorder and delete pages afterwards with Organize PDF.
- Mixed portrait and landscape pages are kept exactly as they are; rotate any of them later with Rotate PDF.
Merge PDFs on Mac, Windows or your phone
bopdf works in any modern browser, so you can combine PDF files on a Mac without Preview tricks, on Windows without installing Adobe Acrobat, or on an iPhone or Android phone. See our step-by-step guide to merging PDFs on Mac and Windows.
🔒 Your files never leave your device
bopdf processes your documents locally with JavaScript (pdf-lib and Mozilla pdf.js) inside your browser tab. Your PDF is never uploaded, stored or seen by us — you can even disconnect from the internet after the page loads and the tool keeps working. When you close the tab, everything is gone.
Frequently asked questions
Can I merge PDF files without uploading them?
Yes. bopdf merges PDFs inside your browser, so the files never leave your computer or phone — useful for contracts, bank statements and IDs.
How do I merge PDFs without Adobe Acrobat?
Open bopdf, select your PDFs, put them in order and click “Merge PDF”. No Acrobat, account or installation is required. On a Mac you can also use Preview — see our Mac & Windows guide.
Does bopdf add a watermark to merged PDFs?
No. The merged file contains only your pages — no watermark, logo or extra page.
How many PDFs can I merge at once?
There is no fixed limit. Dozens of files work fine on a laptop; the practical limit is your device memory.
Will merging reduce quality?
No. Pages are copied as-is without re-compressing images or fonts, so the output looks identical to the originals.
Can I merge password-protected PDFs?
Not directly. Remove the password first in a PDF reader you trust, then merge the unlocked copies.
Are bookmarks and form fields kept?
Page content is kept perfectly. Document-level bookmarks (outlines) and interactive form fields are not carried over to the merged file.
Are my files uploaded to a server?
No. Everything happens in your browser on your own device. Files are never sent over the internet, which makes bopdf suitable for confidential documents.
Is there a file size limit?
There is no fixed limit, but very large files (hundreds of MB) depend on your device memory. On phones, files up to about 100 MB usually work well.