Merge PDF
Merge PDF files into one document. Add up to 20 PDFs in the order you want, join them, and download a single file — no account, nothing to install, nothing uploaded.
- Input
- 2 to 20 PDF files
- Output
- One combined PDF
- Runs
- In your browser. The file never leaves your device.
- Cost
- Free. No sign-up, no watermark.
Choose PDF files
or drop them here · up to 20 files
How to merge PDF files
Add your PDFs
Drop two or more PDF files onto the page, or click to choose them. You can add up to 20 files.
Check the order
Each file is shown as a card with its first page, its page count and its size. Drag the cards into order (or use the arrows, or sort by name), click one to read every page, and remove any file you added by mistake.
Merge
Click Merge PDFs. Every page of every file is copied, in order, into one new document.
Download
Save the merged PDF. It exists only in this browser tab, so download it before you leave the page.
Why merge PDFs with IwillPDF
Pages copied, not re-rendered
Each page goes into the new file as it is, so text stays selectable and images keep their original quality.
Mixed page sizes are fine
Combine A4 reports, US Letter forms and landscape slides — every page keeps its own size and orientation.
Up to 20 files at once
Merge a whole folder of invoices, scans or chapters in one go instead of two files at a time.
Frequently asked questions
How do I join PDF files into one?
Add the PDFs in the order you want them, then click Merge PDFs. Every page of every file is joined, in that order, into one new PDF that downloads to your device.
How many PDFs can I merge at once?
Up to 20 files per merge. For more, merge them in batches of 20, then merge the results together.
What order are the files merged in?
The order of the cards: the first file's pages come first, then the second file's, and so on. To rearrange individual pages afterwards, open the merged file in Organize PDF.
Will merging reduce the quality of my PDF?
No. Pages are copied into the new document rather than re-rendered or recompressed, so the merged file looks exactly like the originals.
Can I merge only some pages of a file?
Merge always takes whole files. Pull the pages you want into their own PDF with Extract Pages first, then merge that file.
Can I interleave two PDFs, for example the front and back sides of a scan?
Yes. Alternate & Mix takes one page from each file in turn, and can reverse the second file, which is what scans of the two sides of a stack of paper usually need.
Is my file uploaded anywhere?
No. Merge PDF runs entirely in your browser: the file is opened and processed on your own device and is never sent to our server. More in the privacy policy.
Is Merge PDF free to use?
Yes. Merge PDF is free, with no account to create and no software to install — open the page in a modern browser and start.