Merge PDF Files Online
Merge PDF documents directly in your browser, reorder them, and download one combined PDF.
Frequently asked questions
How does the Merge PDF tool work?
Combine multiple PDF files in the order you choose. The operation runs from the tool workspace after you choose multiple PDF files.
Are files uploaded when I use Merge PDF?
No. Processing is designed to run locally in your browser, so PrefillPDF does not receive or store the document used by this tool.
Will Merge PDF overwrite my original file?
No. Your source remains unchanged. The tool creates a separate result for download.
What are the file limits for Merge PDF?
You can use up to 20 files with a combined size of up to 150 MB per operation.
Can Merge PDF open password-protected PDFs?
Encrypted PDFs may fail to open. Unlock the document first and then use the unlocked copy.
Does Merge PDF reduce document quality?
The tool avoids intentional recompression when page content can be copied directly. Conversion tools render output at the configured quality.
Can Merge PDF preserve the order I choose?
Yes. The combined document follows the file order shown before you start the merge.
Can I merge PDFs with different page sizes?
Yes. Letter, A4, landscape, and custom-sized pages can be combined in one document while keeping each page’s original dimensions.
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