Will iOS Files preserve PDF form fields and digital signatures?

Yes for visual content, but signatures may be flagged as 'invalid' after merging because the file checksum changes (this is standard PDF behaviour, not a Files bug). If signature validity matters, sign after merging, not before.

Can I merge a PDF and a photo from my Camera Roll on iPhone?

Yes. In Files: select the PDFs and image together, More > Create PDF — it converts the image to a PDF page automatically. In PDFWix: convert the photo first via JPG to PDF, then merge. The PDFWix route gives you better control over page size and orientation.

How to Merge PDFs on iPhone

A simple step-by-step guide to merge pdfs on iPhone using PDFWix's free online tools.

How it works

Open Files — Open the Files app on iPhone or iPad and navigate to your PDFs.
Select PDFs — Tap the … menu, choose Select, then tap each PDF in the order you want.
Tap Create PDF — Tap the … menu at the bottom and choose Create PDF.
Find the merged file — The merged PDF appears in the same folder, named PDF.pdf.
Or use PDFWix — For more control, open Safari, go to pdfwix.com/merge-pdf, tap Select files, choose PDFs from any source, reorder, and tap Merge PDF.

Frequently asked questions

How do I merge PDFs on an iPhone without an app?

Two free options, both with no app install: (1) the built-in Files app — tap Select, tap each PDF, tap More > Create PDF. Requires iOS 15+. (2) PDFWix in Safari at pdfwix.com/merge-pdf — works on iOS 13+ and pulls PDFs from any source via the share sheet.

Is Adobe Acrobat or Smallpdf needed on iPhone?

No. Adobe Acrobat's iOS app gates merging behind a $9.99/month Pro subscription. Smallpdf's iOS app caps you at 2 free tasks per day. iOS Files does it free with no limits, and PDFWix in Safari is also free with no daily cap.

Are my PDFs private when I merge in Safari?

Yes — PDFWix's merge runs entirely in Safari on your iPhone using WebAssembly. Files never reach our servers. The Files app native merge is also fully on-device. Both are appropriate for confidential documents.