Merge PDF
Combine multiple PDFs into one file. Files stay on your device — nothing is uploaded.
Methodology & standardsRuns on your device
Inputs
Results update liveAdd PDF files
or drag and drop here
PDF only · up to 100 MB per file · processed locally in your browser
Related tools
Adjacent decisions
FAQ
Frequently asked questions
How the calculation works and where its limits are.
Are my PDFs uploaded to a server?
No. Merge PDF runs entirely in your browser using local processing.
How many files can I merge?
Up to 20 PDFs per session, within the browser memory limits shown on the upload area.
Will form fields stay editable after merging?
Not always. Merging rebuilds pages and may drop AcroForm field associations. Fill or flatten forms first when you need preserved field behavior.