Guide
How to sign a PDF on an iPhone
Your iPhone is the easiest device to sign a PDF on, because you can draw your signature naturally with a finger. You do not need the Files app workaround, a third-party app, or an Adobe subscription — just Safari.
Updated June 2, 2026
Step by step
- 01
Open the signer in Safari
On your iPhone, open Safari and go to the DocSignHub signer. There is no app to install and no account to create.
- 02
Upload the PDF from your phone
Tap the upload area and choose the PDF from your Files, an email attachment, or iCloud Drive. The document loads directly in the browser on your phone.
- 03
Draw your signature with your finger
Select the draw option and sign with your finger or an Apple Pencil. Because it is a touchscreen, this produces a natural-looking signature. You can also type or upload one instead.
- 04
Place it and save the signed PDF
Drag your signature onto the signature line, resize it with a pinch, then download. Save the signed PDF back to Files or share it straight from your iPhone.
Why use Safari instead of the Files markup tool?
iOS does include a basic Markup feature, but it is designed for annotating, not signing. It can be fiddly to size a signature, it does not let you type a signature in a handwriting font, and reusing the same signature across documents means re-drawing it every time.
A dedicated browser signer gives you a cleaner signing flow, three signature styles, and precise placement — without leaving Safari and without installing anything.
Signing an emailed PDF on your iPhone
If the PDF arrived as an email attachment, you have two easy options. Save the attachment to Files first, then upload it in the signer; or open the signer and choose the attachment directly from the file picker. Either way the document is loaded into the browser on your device.
After signing, download the file and use the iOS share sheet to send it straight back as a reply — the whole round trip happens on your phone.
Your document never leaves your phone
Because the signer processes the PDF locally in Safari, your document is not uploaded to any server. That matters on mobile, where you are often signing something personal — a lease, a medical form, an offer letter — over a cellular connection. Nothing is transmitted, stored, or exposed.
Frequently asked questions
Can I sign a PDF on my iPhone without an app?+
Yes. Open the DocSignHub signer in Safari, upload the PDF, draw your signature with your finger, place it, and save — no app download required.
Does it work with Apple Pencil?+
Yes. On a compatible iPad you can sign with the Apple Pencil for an even more precise, natural signature, using the same browser tool.
How do I sign a PDF that came in an email?+
Save the attachment to Files (or pick it directly in the upload dialog), open the signer, add your signature, then download and share the signed copy from the iOS share sheet.