Merge PDF Online

Whether you're putting together a report from separate sections, combining scanned pages into one file, or assembling a portfolio, this tool merges multiple PDFs into a single document — in the order you choose.

How it works

Files are merged directly in your browser. There's no upload to a remote server, which matters if your documents contain anything sensitive — contracts, financial records, ID scans. The merging happens using PDF-lib, an open-source library that manipulates the PDF structure directly rather than converting pages to images, so text stays selectable and the file stays sharp.

How to use it

1. Upload the PDF files you want to combine (drag and drop works, or select multiple at once)
2. Reorder them by dragging — the final document follows this order
3. Click merge
4. Download the combined PDF

A few things worth knowing

• Page order matters. Double-check the order before merging; you can drag files up or down in the list to rearrange.
• Large files take a moment. Merging is fast for typical documents, but very large PDFs (hundreds of pages, or with lots of embedded images) will take longer since it's all processed on your device.
• Text stays selectable. Unlike some tools that flatten pages into images, this keeps your PDF's text layer intact, so it's still searchable and copyable after merging.

FAQ

Is there a limit on how many files I can merge? No fixed limit — practically, it depends on your browser's available memory for very large batches.

Will merging affect the quality of my PDFs? No. The pages are combined as-is; nothing is re-compressed or re-rendered.

Are my files uploaded to a server? No, the whole process runs locally in your browser.