Android doesn't include a built-in way to combine PDFs from the Files app. Installing a dedicated app for a one-off task is overkill, and many of those apps upload your files to a server to do the merging.
A browser-based merge tool skips the install and the permissions prompt entirely. Since the merge happens with JavaScript running on the page itself, there's no separate app storing or transmitting your files.
Android typically saves browser downloads to the Downloads folder, accessible from the Files app. From there you can move it, rename it, or share it directly to another app.
Ready to try it yourself?
Merge PDFs on your Android phone →No — Chrome can run the merge tool directly as a web page, with no app install required.
Yes, any modern Android browser (Chrome, Samsung Internet, Firefox) supports it.