How to use the Merge PDF
- Add two or more PDF files
- Click Convert
- Download the merged PDF
About this tool
Join several PDF files into a single document in seconds. Files are merged in the order you add them and all pages are kept. Because everything runs locally, contracts and personal documents are never sent to a server.
How merging works
The pages of each PDF are copied into one new document, in the same order as the files in the list. The pages are not re-rendered, so text and images keep the quality they had. Add your files in the order you want them to appear.
Before you merge
- Password-protected or encrypted PDFs need to be unlocked first, because they cannot be read in the browser.
- Interactive extras such as bookmarks and form fields may not carry over to the merged file.
- Large files create a large result. If it is too big to email, compress the original images before you make the PDFs.
Common uses
Join a cover letter with a CV, combine invoices into a single file for your accountant, or put scanned pages from different sources into one document. To pull only some pages out of a PDF, use Split PDF.
Privacy and limits
Files are processed inside your browser and are not uploaded to FormatVolt. Each file can be up to 50 MB. Very large images or PDFs can fail on devices with little memory, so try a smaller file or a desktop browser if that happens.
Frequently asked questions
Is it really free?
Yes. There are no limits, watermarks or sign-ups.
Are my files uploaded anywhere?
No. The conversion runs inside your browser, so your files never leave your device.
Can I merge password-protected PDFs?
No. Remove the password first, then merge.
Is the quality changed?
No. Pages are copied as they are, so quality stays the same.
Does merging reduce PDF quality?
No. Pages are copied as they are, so text and images keep their original quality.
Can I merge password-protected PDFs?
Not directly. Remove the password in the program that created the file, then merge the unlocked copy.
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Last updated: November 6, 2026