Merge PDF
Combine two or more PDFs into a single file. Private and fast.
100% in your browser No upload required Free, no signup
How it works
- 1Drop all the PDFs you want to combine into the box.
- 2Drag the files to set the order you want them in.
- 3Click Merge and download the combined PDF.
Why CalmPDF
- Private by design. Your PDF is processed inside your browser. It is never uploaded to a server.
- Fast. No round trip to the cloud, so it works as fast as your laptop can run JavaScript.
- Free. All tools are free to use with no signup and no daily limits.
Frequently asked questions
How many PDFs can I merge at once?+
There is no hard limit in CalmPDF. The practical limit is your device memory — most users can merge dozens of files without issue.
Will the bookmarks and links be kept?+
Yes. CalmPDF preserves internal links, bookmarks, and form fields when merging.
Can I change the order of the PDFs?+
Yes. After adding your files, drag them up or down in the list to change the order before merging.
Is it really private?+
Yes. The merge happens inside your browser using JavaScript. No file is sent to our servers.