Merge PDF
Combine multiple PDF files into one.
Document Enhancements
Background Color
Free PDF Merger — Combine PDFs Locally
Select two or more PDF files and AiFileStudio will combine them into a single document, in the order you selected them. All of the merging happens locally using the pdf-lib library — your files are never uploaded to a server, which matters if you're combining contracts, statements, or other sensitive paperwork.
The merged file preserves each source PDF's pages exactly as they were, appended one after another. Once merging is complete, the combined PDF downloads straight to your device.
Frequently Asked Questions
Is there a limit on how many PDFs I can merge?
No fixed limit, though very large files are bounded by your device's available memory since everything happens in-browser.
Does merging affect the quality or formatting of my PDFs?
No — pages are copied as-is from each source file, so formatting, fonts, and images stay exactly the same.
Are my PDFs uploaded to a server?
No. Merging is done entirely client-side; your files stay on your device throughout.