PDF Merger
Combine several PDF files into one document: bank statements, scanned forms, certificates or application documents. Add your files, put them in the order you want and download a single merged PDF.
Last reviewed:
The files are merged inside your browser and are never uploaded to a server, which makes this a safer choice for documents with personal details.
How to use this calculator
- Click Add PDF files and choose two or more PDFs. You can add more in several rounds.
- Use Up and Down to arrange the order, or Remove to drop a file.
- Click Merge and download.
- Open the merged file and check the pages before you send it.
Formula and variables
Merged pages = pages of file 1 + pages of file 2 + … in the order shown
- Order - files appear in the list order from top to bottom.
Pages are copied as they are, so text, images and page sizes stay the same. Bookmarks and form fields from the original files may not carry over.
Worked example
Merge a 2-page application form, a 3-page statement and a 1-page certificate.
| Files | form.pdf (2 pages), statement.pdf (3 pages), certificate.pdf (1 page) |
|---|---|
| Result | merged.pdf with 6 pages |
- The files are added in the order shown.
- All pages of each file are copied into a new document.
- The new document is saved and downloaded.
What changes the result
- File size. The merged file is about as large as all inputs added together.
- Password protection. Protected PDFs must be unlocked first.
- Order. Check the list order before merging. Changing it afterwards means merging again.
- Device memory. Very large files may be slow or fail on phones.
Benefits and practical uses
- No upload, no sign-up and no watermark.
- Control over page order.
- Works on phones and computers.
Assumptions and limitations
- Up to 20 files, 50 MB each and 100 MB in total.
- Password-protected or damaged PDFs are rejected with a message naming the file.
- Interactive features such as bookmarks and fillable fields may be lost.
- Uses the open-source pdf-lib library, loaded only when this page is used.
Frequently asked questions
How do I merge PDF files?
Add the files, arrange them in the order you want and click Merge and download.
Are my PDFs uploaded?
No. The merging happens in your browser and the files never leave your device.
Why can't I merge a particular file?
It may be password-protected or damaged. The message names the file. Remove the password and try again.
Is there a size limit?
Up to 20 files, 50 MB each and 100 MB in total, because browsers have limited memory.
Will the quality change?
No. Pages are copied as they are, with no recompression.
Can I merge images?
Not directly. Convert images to PDF first, then merge.
References
Page last reviewed on . This calculator gives estimates for planning only; it is not financial advice and not an offer from any lender.