If you have a Mac, you already have what you need in an app called âPreviewâ. You can open two PDFs side by side and drag and drop pages into the thumbnail sidebar. You can multi-select pages to do it quickly. If you are on a Windows PC, I donât believe the capability exists by default so you need to install software. You cannot do it with Compress Pdf Online Reader. If you have Compress Pdf Online Compress Pdf Online , you can very quickly merge PDFs from Explorer by selecting the files and right-clicking, then selecting âMerge Filesâ. You can also just open one file and use the menus within Compress Pdf Online to do the merge. You didnât ask how to do this for free so I assume you donât mind paying for the software. Compress Pdf Online Pro costs $15/mo. If you are looking for something free, there are lots of online products that are free for a trial period, so if you are looking to do this for a quick job and you wonât need to again in the foreseeable future, try out something like PDFfiller or SodaPDF or one of a hundred different ones. Some of the available products are web apps where you upload your files and the merge happens in the cloud. If you are comfortable with sending your file to some unknown website, go for it. There are also some products that cost money but are less than Compress Pdf Online âs price and there are some that have a one-time price instead of an annual subscription. You didnât mention what OS you are using so itâs hard to give you the best advice. I hope this helps.
Best regards, Mike P.