Is it free to combine multiple PDFs into one file on Windows?

Yes. Every core FernPDF tool is free, with no account, no watermark, and no trial limits.

How many PDFs can I combine at once?

As many as your device has memory for. Nothing is uploaded, so there is no per-file size cap and no queue, the practical limit is how much RAM the browser is willing to hand a single tab, which on an ordinary laptop is dozens of large documents.

What do the two toggles do?

“Add page numbers” stamps a single continuous count across the whole merged file, so the numbering runs straight through instead of restarting at each source document. “Flatten form fields” bakes filled-in form values into the page as static content, which is worth doing before you send a completed pack to someone who should not be able to change the answers.

Merge PDF

Merge PDF · Windows

How to combine multiple PDFs into one file on Windows

You don't need special software to combine multiple PDFs into one file on Windows. FernPDF runs entirely in Edge or Chrome on Windows: open the tool, drop your file, download the result. The merged file is assembled in your browser's memory and downloads instantly. It never touches a server.

On Windows, you drag it into the drop zone from File Explorer, or click to open the native file picker. Once the combined document is ready, it downloads to your Downloads folder in File Explorer, or wherever Edge or Chrome is set to save files, check the browser's download tray (Ctrl+J).

A locked-down work laptop that blocks .exe installers or needs admin rights for new software doesn't block a browser tab, so this works on managed corporate devices where installed PDF software often can't.

No desktop installer, no admin rights, no paid software. It works on locked-down work laptops because it's just a web page. Windows 10 and 11 are both fine.

Step by step

1Open the Merge PDF tool in Edge or Chrome on Windows. No install, no account.
2Add two or more PDFs: drag it into the drop zone from File Explorer, or click to open the native file picker.
3Drag the file cards into the order you want; optionally turn on page numbers or form flattening.
4Click “Merge PDF” and download the combined document. It lands in your Downloads folder in File Explorer, or wherever Edge or Chrome is set to save files, check the browser's download tray (Ctrl+J).

No upload · no account · no watermark

FAQ

Common questions

Yes, FernPDF is a web app, so it runs in Edge or Chrome on Windows with no installation. All processing happens on your device, in this browser tab.

Every FernPDF tool processes files in your browser: read how the privacy model works, or verify it yourself in your network tab.