Merge PDF Files Online, Free
Join several PDFs into one document, in the order you choose
🔒 No upload • No account • No watermark • Runs in your browser
Merge PDF combines two or more PDF files into one. You decide the order, and the joined file is built on your own device, so private paperwork never travels to a server.
How to use Merge PDF
- Open the tool and choose every file you want to join (or drop them in together).
- Use the arrows to put the files in the order the reader should see them. Remove any you added by mistake.
- Press Merge PDFs.
- Download merged.pdf.
Features
- Add as many files as your device can handle, with no daily task limit.
- Reorder files before joining, so there is no need to rename them first.
- Works offline once the page has loaded.
- No watermark is added to the result.
Good to know
- Merging does not shrink the file. Use Compress PDF afterwards if the result is too large to email.
- Password-protected files must be unlocked first with Unlock PDF.
Questions and answers
Is there a limit on the number of pages?
FirePDF sets none. The practical limit is your browser memory, so very large scans may be slow on older phones.
Will the merged file keep my page sizes?
Yes. Each page keeps its own size and orientation.
Can I merge files from my phone?
Yes, in a current mobile browser. Choose the files from your phone storage or cloud drive app.
Privacy
This tool runs inside your browser. Your file is read into your device’s memory, processed there and handed back as a download. It is not sent to a FirePDF server. You can test this by switching off your internet connection after the page has loaded and running the tool again. Read the Privacy Policy and the Security page for details.
Want more background? Read the step-by-step guide.