Frequently Asked Questions
Is this PDF merger really free?
Yes. You can combine PDF files without creating an account, installing software, or paying for a subscription.
Are my PDF files uploaded anywhere?
No. ExpressPDF combines your PDFs inside your browser. Your files remain on your local device while the tool runs.
How many PDFs can I merge at once?
You can add as many PDFs as your device can comfortably process. Very large scanned documents may require more memory, so split large batches if your browser slows down.
Can I change the order before downloading?
Yes. Your final PDF follows the order shown in the selected files list. Use the order controls before clicking Merge & Download PDF.
Why did my PDF fail to merge?
Some PDFs are password protected, encrypted, damaged, or saved with unusual security settings. Remove the problem file and try again, or resave it as a new PDF first.