PDF Guides
How to Sign a PDF on iPhone Without an App
Most guides for signing a PDF on iPhone point you to the App Store first. You don't actually need to install anything — your iPhone's own Files app has a built-in markup signature, and a browser-based signing tool covers everything else without an app download.
The built-in option: Markup in Files
Open the PDF in the Files app, tap the markup (pen tip) icon, then the plus button, and choose Signature. You can draw a signature with your finger, save it for reuse, and drag it onto the page. This works offline and requires no download, but it's fiddly for precise placement and doesn't fill in typed text fields well.
A faster option: sign it in Safari
For a cleaner result — typed signatures, adjustable size, and easy repositioning — open the PDF signing tool directly in Safari on your iPhone. Upload the file, type, draw, or upload an image of your signature, place it on the page, and download the signed copy. Nothing installs on your phone, and the file never leaves your device.
- Open the sign PDF tool in Safari
- Upload the PDF from Files or your photo library
- Type, draw, or upload a signature image
- Position it on the page and download the signed PDF
Which one should you use?
Markup in Files is fine for a quick, one-off signature on a document you already have open. A browser tool is better when you want a typed signature that looks consistent, need to reposition it precisely, or are signing something you'll want to save and reuse the signature for later.
Frequently asked questions
Do I need to download an app to sign a PDF on iPhone?
No. iPhone's Files app has a built-in markup signature, and browser-based tools let you sign a PDF in Safari without installing anything.
Is a signature added this way legally valid?
For most everyday documents, a typed or drawn electronic signature is treated the same as a signature added on desktop. For contracts with specific legal requirements, check what your situation requires.
Does the file get uploaded anywhere?
No, when using a browser-based tool that processes files locally, the PDF stays on your device the whole time.
Can I save my signature to reuse it later?
The Files app markup signature is saved on your device for reuse. Browser-based tools typically ask you to re-enter or re-draw it each session unless the tool offers to remember it locally.