Merge PDF files online for free
This free Merge PDF tool joins two or more PDF documents into a single file directly inside your web browser. Add your files by dragging them onto the box or tapping to browse, arrange them in the order you want by dragging each row up or down, and click Merge. Your combined PDF downloads instantly to your device.
Because every step runs locally with JavaScript, your documents are never uploaded to any server. This makes the tool ideal for contracts, invoices, bank statements, medical records, and any other sensitive paperwork. It works on Windows, macOS, Linux, Android, and iPhone, and keeps working even after your internet connection drops.
How to combine PDFs
Select all the PDFs you want to join, reorder them with the up and down controls or by dragging, remove any file you added by mistake, and press the Merge button. The page count and file size update automatically so you always know what you are creating.
Frequently asked questions
Is it safe to merge confidential PDFs here?
Yes. All processing happens inside your browser using JavaScript. Your files are never sent to a server, never stored, and never seen by anyone but you.
How many PDF files can I merge at once?
There is no fixed limit. You can merge as many files as your device's memory allows. Very large combined files (hundreds of megabytes) may be slow on older phones.
Will merging reduce the quality of my PDFs?
No. Pages are copied exactly as they are, so text stays selectable and images keep their original resolution. Merging does not recompress your content.
Can I change the order of the pages?
Yes. Drag any file up or down in the list, or use the arrow buttons, before you merge. Files are combined in the exact order shown.
Does it work on my phone?
Yes. The tool is fully responsive and works in mobile browsers on iPhone and Android, including the file picker and drag reordering.