How to Merge PDF Files Online Into a Single Document
To merge PDF files into a single document, load two or more PDF files into memory, arrange them in your preferred reading sequence, and compile their pages into a unified document structure. In-browser processing joins the pages locally without uploading sensitive contracts or personal records to external servers.
Step-by-Step Instructions
Add two or more PDF files
Select or drop the PDF files you want to combine.
Arrange document order
Use the up (↑) and down (↓) controls to arrange the files into the exact sequence you want them to appear in the combined document.
Tip: Double-check the top-to-bottom sequence before clicking merge.Merge and download
Click Merge to compile the document pages in memory and save your unified PDF file.
Technical Capabilities & Specifications
Alternative Methods on Windows, Mac & Mobile
Preview App
Open your first PDF in Preview, click View > Thumbnails, drag additional PDF files from Finder into the thumbnail sidebar to insert them, then click File > Export as PDF.
Edge / Print to PDF
Open PDFs in Microsoft Edge or dedicated viewer utilities, or use virtual print workflows to combine pages.
pdfunite Utility
Install poppler-utils and run "pdfunite file1.pdf file2.pdf merged_output.pdf" in your terminal.
Frequently Asked Questions
Can I combine encrypted or password-protected PDF files?
No. Encrypted PDFs must be unlocked or have their password protection removed before they can be merged.
How do I control the order of merged pages?
Use the up (↑) and down (↓) buttons next to each uploaded PDF to set the exact order before clicking Merge.
Are my confidential contracts or financial records uploaded anywhere?
This tool processes the file in your browser using the site's client-side engine. Your PDF documents never leave your computer or phone.
Is there an arbitrary page limit?
There is no artificial page limit; processing capacity depends only on your local device available memory.