Open the Merge tool, drop your PDFs onto the upload area, and drag the cards into the order you want them in. Click Merge and the file downloads in a few seconds.
Everything happens in your browser — your files never leave your device. That is why merge works for huge files (we have tested up to 200 MB) and is genuinely free, with no daily quota.
Need to insert a single page from one PDF into another? Merge first, then use the Rotate & Reorder tool to drag the inserted pages where you want them.