Sign PDFs on iPhone

Signing PDF documents on an iPhone used to require downloading a dedicated app from the App Store, creating an account, and often paying a subscription fee. With SigPDF, all of that is unnecessary. Our browser-based PDF signing tool works directly in Safari, Chrome, Firefox, or any browser installed on your iPhone. Simply open the website, upload your PDF, and sign it with your finger on the touchscreen. The entire process takes less than a minute, and your document never leaves your device because all processing happens locally in the browser.

While Apple does include a basic Markup feature within the Files app and Mail that lets you add a signature to a PDF, it can be cumbersome to use. You have to navigate through multiple menus, the signature drawing area is small, and there are limited options for customizing your signature. SigPDF provides a full-screen signing experience optimized for iPhone's touch display. You can draw a smooth, natural-looking signature using your finger, type your name and choose from multiple handwriting-style fonts, or upload a photo of your existing signature. You can also add text fields for dates, initials, and other information that many documents require alongside a signature.

Privacy is a top concern when signing documents on a mobile device, especially for sensitive contracts, legal agreements, or financial paperwork. SigPDF processes your PDF entirely within your iPhone's browser. Your files are never uploaded to a remote server, which means there is zero risk of your private documents being stored, accessed, or leaked. This client-side approach also means SigPDF works even when your iPhone has a weak or intermittent internet connection. Once the page loads, the signing tool operates offline.

SigPDF is compatible with every iPhone model that runs iOS 15 or later, including iPhone SE, iPhone 12, iPhone 13, iPhone 14, iPhone 15, and iPhone 16 series. It works in both portrait and landscape orientation, so you can turn your phone sideways for a wider signing area if you prefer. The tool automatically adjusts to your screen size, ensuring that buttons, the signature pad, and the PDF viewer are all properly sized for comfortable use on smaller screens. Whether you are signing a lease agreement, an NDA, a contract, or an invoice, SigPDF makes the process effortless from your iPhone.

Step-by-Step: Sign a PDF on iPhone

1. Open Safari or Chrome on your iPhone and navigate to SigPDF
2. Tap the upload area or “Choose File” to select a PDF from your Files app, iCloud Drive, email attachment, or camera roll
3. Your PDF loads in the viewer — scroll to the page where you need to sign
4. Draw your signature with your finger on the touchscreen, type your name, or upload a signature image
5. Tap on the document to place your signature, then pinch to resize or drag to reposition
6. Add any additional text fields, dates, or initials as needed
7. Tap “Download” to save the signed PDF to your iPhone