Merge PDF files

Combine two or more PDF files into a single document, in the exact order you choose. The merge runs entirely in your browser, so your files never leave your device, with no signup, no watermark, and no upload wait. Need it in your app? The same merge is one API call.

Runs entirely in your browser. Nothing is uploaded.

Drop PDF files here, or click to choose

They combine in the order you add them.

How to use Merge PDF files

Add your PDFs Drop your PDF files into the box, or click to browse and select them. Add as many as you need.
Put them in order Files merge from top to bottom in the order you add them. Remove any you did not mean to include.
Merge and download Click Merge PDFs. The combined file is built on your device and downloads instantly as merged.pdf.

Why FileAlloy

Nothing is uploaded

Merging happens locally in your browser. Your documents never touch a server, so there is nothing to leak or store.

No signup, no watermark

Free and unlimited, with no account to create and no watermark stamped on your finished file.

Quality stays intact

Pages are copied as-is. Text stays selectable and images stay sharp, with no re-compression.

Ready as an API

When you outgrow the browser tool, the exact same merge is a single REST call you can automate.

Do it at scale with the API

Merging PDFs inside a backend or workflow? The same operation is a single call to /v1/merge, so you can batch and automate it with no browser.

curl -X POST https://api.filealloy.com/v1/merge \
  -H "X-API-Key: fa_live_your_key" \
  -F "file=@first.pdf" \
  -F "file=@second.pdf" \
  -o merged.pdf

Get an API key

Frequently asked questions

Is it really free?

Yes. The in-browser merge tool is completely free, with no limits, no account, and no watermark on your output.

Are my files uploaded to a server?

No. The browser tool merges your PDFs locally on your device, so nothing is uploaded or stored. If you use the API instead, files are processed in memory and deleted immediately after the response is returned.

How many PDFs can I merge at once?

As many as you like. Very large batches depend on your device's available memory, since the work happens locally rather than on a server.

Can I change the page order?

Files combine in the order you add them. Remove and re-add a file to reposition it. To pull out or drop specific pages, use Split PDF or Remove pages.

Does it work on Mac, Windows, and mobile?

Yes. It runs in any modern browser with nothing to install.

Can I merge PDFs programmatically?

Yes. Call the /v1/merge API endpoint with your API key to merge PDFs directly from your own code or automation.