Quick answer
Open Merge PDF in Safari, add your PDFs from the Files app, set the order with the arrows, and download the combined file.
Step by step
- Open Safari and go to Merge PDF.
- Tap the drop area and choose your first PDF in the Files app. In the picker you can tap Select to choose several at once, or tap the drop area again to add more later.
- Use the up and down arrows to put the files in order.
- Tap "Merge PDFs".
- Open the Safari download icon, find the merged PDF in the Downloads folder of Files, and use Share to send it.
Tips
- Files that arrived in Mail or WhatsApp need to be saved to Files first (Share, then "Save to Files").
- Rename the PDFs 01, 02, 03 in Files before you start, so the order is clear in the picker.
- If the result is too big to send, shrink it with Compress PDF.
Good to know
The merge happens in Safari on your iPhone, so your documents are not uploaded.
Try it now: Merge PDF. Free, no signup, and your files stay in your browser.