Usually, learning how to combine PDF files on Windows will require you to download a third-party app. Therefore, it’s best to use trusted methods on both Windows and Mac.
They may even find identification about you and the system you’re using. Whether it’s through selling or utilizing your data in some way, free services like these always come with a catch. Many online converters collect your metadata (the hidden information within your documents) to use for profit. While you can use these services casually, we highly advise practicing caution in selecting ones that can preserve your privacy and data security.
Most of them are free to use so you can combine and even edit your files.
If you consulted Google first, you would find a bunch of online PDF converters. So, you want to learn how to combine PDF files.