Merge PDF

Drop in two or more PDFs, arrange them in the order you want, and download a single combined file. Merging runs entirely in your browser with the open-source pdf-lib library — your documents are never uploaded.

On-device — downloads its library once PDF Free · no signup

Network notice: Your PDFs never leave your device. The open-source processing library (pdf-lib, MIT license) is fetched from the cdnjs CDN the first time you use the tool.

How to use

Drop PDF files onto the drop zone, or click it to browse. Add as many as you need.
Reorder them with the ↑ ↓ buttons — the merged file follows the list from top to bottom.
Click “Merge & download” and save the combined PDF.

Supported formats

Input: standard (unencrypted) PDF files, up to 200 MB each.
Output: a single merged PDF containing every page of every input, in order.

Privacy

Your input is processed in your browser and is never uploaded. The first time you use the tool, your browser downloads its open-source processing library from cdnjs.cloudflare.com — the library is downloaded, your data is not sent. Privacy policy.

Limitations

Password-protected PDFs cannot be merged — remove the password first.
Interactive form fields may lose interactivity when copied between documents.
Very large merges are limited by your device's memory, since everything runs locally.

FAQ

Are my PDF files uploaded to a server?

No. The files are read and merged entirely in your browser using the open-source pdf-lib library. They never leave your device, which makes this safe for contracts and confidential documents.

Is there a limit on the number of files?

No fixed limit — practical limits come from your device's memory. Dozens of typical documents merge without trouble.

Does the merged PDF get a watermark?

No. The output is exactly your input pages combined, with no watermark, branding or quality change.