How to merge PDFs
Merging PDFs means combining two or more files into one, in the order you choose. On BestPDFInTheWorld it takes four steps: drag the files in, order them in the list, press merge and download the result. Everything runs in your browser, the file never leaves your computer, and pages are not recompressed, so the final quality matches the originals. This tool is part of the Premium subscription, EUR 1.99 a month, which removes the limits on every tool and adds OCR. Sign PDF opens on the free plan, with one signature a day.
Verified 2026-08-12
- Four steps, nothing to install: choose the files, order them, merge, download.
- The order on screen is the final order: every file is numbered, with buttons to move it up and down.
- Quality preserved: pages are copied without recompression, so the result matches the originals.
- No uploads: all processing runs in the browser, and the tool keeps working offline once the page has loaded.
- This tool is part of the Premium subscription, EUR 1.99 a month, which removes the limits on every tool and adds OCR. Sign PDF opens on the free plan, with one signature a day.
How to merge two PDFs into one, step by step
Merging two PDFs is the simplest job in this list and takes under a minute:
- Open the Merge PDF tool.
- Drag the two files into the window, or click to pick them.
- Press merge. The processing runs on your computer, not on a server.
- Download the single PDF you get at the end.
Nothing to install, no account and no upload wait. The result appears instantly, with the same quality as the original files.
How to merge several PDFs and choose the order
When you merge more than two files, the tool shows a numbered list, in the order they will be merged. Each row has two buttons, one to move it up and one to move it down, the order you see on screen is exactly the order of the final PDF, not the order in which you loaded the files. On the first row the up button is disabled, and on the last row the down button is.
There is no artificial limit to how many PDFs you can merge at once: the practical ceiling is your browser's memory, and for most cases dozens of files work without a problem.
Tips for merging PDFs
- Make sure the files open in another reader before merging. A password-protected or corrupted PDF makes the operation fail; this tool cannot open encrypted files. If you need to remove protection from your own file, run the Unlock PDF tool first.
- Merging is not compressing. Pages are copied without recompression, so the quality matches the originals. If the result gets too heavy to email, follow up with the Compress PDF tool.
- It works on your phone. The tool was built mobile first, and the ordering buttons work by touch.
- It works offline. Once the page has loaded once, you can merge PDFs with the network off, the work is all done by your processor.
Is merging PDFs free? What are the limits?
No. This tool is part of the Premium subscription, EUR 1.99 a month, which removes the limits on every tool and adds OCR. Sign PDF opens on the free plan, with one signature a day.
| Plan | What it allows |
|---|---|
| Free plan | Only Sign PDF opens without paying, with one signature a day and files up to 10 MB. |
| Premium (EUR 1.99/month) | This tool is part of the subscription: no limits anywhere, plus OCR and larger batches. |
Questions about merging PDF.
Does merging PDFs lose quality?
No. Pages are copied from the original files into the new PDF without being recompressed. The result keeps the same text and image quality as the source files.
Is merging PDFs free?
No. This tool is part of the Premium subscription, EUR 1.99 a month, which removes the limits on every tool and adds OCR. Sign PDF opens on the free plan, with one signature a day.
Are my files kept on your servers?
No. Nothing is sent to a server: the processing runs in your browser, start to finish. If you need to repeat the job, open the original files again.
Can I choose the file order after loading them?
Yes. The list shows every file numbered by the position it will take, and each row has buttons to move it up and down. The order on screen is exactly the order of the final PDF.
How many PDFs can I merge at once?
There is no artificial limit set by us. The ceiling is your browser's memory: in most cases, dozens of files work without a problem.
Does merging PDFs work on mobile?
Yes. The tool was built mobile first, and it works without installing any app.
Keep reading
How to split PDFs
Step by step to create a new PDF with only the pages you choose, by single numbers or ranges, without uploading anything.
How to rotate PDF pages
Step by step to rotate PDF pages 90, 180 or 270 degrees, all or only the ones you specify, with the rotation written into the file and nothing sent to a server.
How to delete PDF pages
Step by step to remove pages from a PDF, by numbers or ranges, without changing the order of the rest and without uploading anything.
Several PDFs to merge?
Deal with it now.
Open the tool and try it. Nothing to install, nothing sent anywhere.
Open Merge PDF