Merge PDF
Combine multiple PDFs into one file in the order you choose. Drag & drop to sort.
Runs in your browser (WebAssembly)
Zero server storage
Your files are never written to disk.
In-memory processing
In-Memory Stream / Client WASM: processed in your browser's memory.
100% privacy & security guarantee
No server uploads; your files are never shared with anyone. How it works
Combine several PDFs into a single file in seconds. Put the files in the order you want and optionally add a bookmark for each file. Merging happens entirely in your browser; your documents are not uploaded, so you can safely merge contracts, invoices or IDs.
How to merge PDF files
- Choose the PDF files you want to merge or drop them on the page.
- Put the files in order by dragging them or with the arrow buttons.
- Press "Merge PDF" and download the single file.
Frequently asked questions
Is merging PDFs free?
Yes. OPPE is free, needs no account and adds no watermark to the result.
How many files can I merge?
Up to 50 files and 300 MB in total at once.
Are my files uploaded to a server?
No. Merging runs in your browser with WebAssembly; your files never leave your device and are wiped from memory when you are done.