Three PDFs in your inbox — a quote, a spec sheet, a signed contract — and the client wants one tidy file. iOS will happily store all three; combining them is the bit it forgot to ship.
Merging on iPhone takes about thirty seconds in Safari.
What iOS Files can and can't do
The Files app on iPhone shows you PDFs in a folder. It will not combine them. There's a long-running rumour that you can long-press and merge — you can't, not on iPhone (iPad does have a tap-and-create-PDF feature for some image types, but not for merging existing PDFs).
Flint's merger handles it in the browser. Add the files in the order you want, drag to reorder if needed, download a single combined PDF.
The actual flow
Save each PDF to Files. Open Safari, go to Flint's merge tool, and add the files one by one (or tap the multi-pick if you've selected several in Files first). The previews appear in a strip — drag to reorder.
Hit Merge. The combined PDF downloads to Files. Share it from there via Mail, Messages, or the share sheet.
Reordering and removing pages along the way
If one of the source PDFs has extra pages you don't want in the final, use delete PDF pages on it first. Or merge first, then reorder PDF pages and trim afterward. Both flows work — the second is faster when you only realise you've got junk pages after you see the combined result.
FAQ
Is there a limit to how many PDFs I can merge?
Flint handles dozens of files in one merge. On iPhone, the practical limit is usually the source files' total size — a couple of gigabytes of scans starts to slow the browser. For everyday use (5–20 files, normal sizes), it's instant.
Will the merged PDF keep bookmarks and links?
Yes. Flint preserves internal links and bookmarks from the source PDFs where the originals contain them. The final file behaves as one document with the original navigation intact.
Can I merge a PDF with images or Word docs?
Merge takes PDFs in. If you've got a Word doc to include, convert it to PDF first (any iPhone PDF print works, or use Flint's converter). For images, save them as PDF via the share sheet, then merge.
When the client wants one PDF and you've got five, merge them on your iPhone in Safari. No app, no waiting, no Acrobat.