Combining PDFs used to mean opening a desktop editor, or worse, printing pages and re-scanning them together. Today, there are three realistic options: a desktop PDF editor, a command-line tool, or a browser-based merger — and for most everyday cases, the browser option is the quickest.
Option 1: Desktop software
Full PDF editors can merge files reliably and offer the most control, such as adjusting individual page rotation mid-merge. The tradeoff is installation time and, for many programs, a paid license just to save the combined file.
Option 2: Command-line tools
Utilities exist for merging PDFs from a terminal, which is efficient if you're already comfortable with scripting and need to merge files as part of an automated workflow. For a one-off task, though, opening a terminal is more overhead than most people want.
Option 3: A browser-based tool
A merge tool that runs directly in your browser needs no installation and works the same on a phone, tablet, or laptop. Because the processing happens locally rather than on a remote server, there's also no waiting for an upload and download round-trip, and no need to trust a third party with the file's contents.
Tips for a clean merge
- Rename your files with numbers first (01-cover.pdf, 02-body.pdf) so you can quickly tell they're in the right order before merging.
- Double-check page orientation in each source file beforehand; a merge tool won't fix a sideways page for you.
- If any source file is password-protected, remove that password before merging, since most merge tools can't read encrypted pages.
Our own Merge PDF tool follows the third approach: drop in your files, drag them into order, and download the combined PDF, all without anything leaving your device.