Can You Add Digital Signatures in Acrobat Reader on iPhone or iPad?
Question details
The user wants to know if it is possible to add digital signatures or certificates to PDF documents using the Acrobat Reader mobile app on iOS devices.
- Product
- Adobe Acrobat Reader
- Device & OS
- iOS
- Scenario
- Attempting to securely sign a PDF document with a cryptographic digital certificate while using an iPhone or iPad.
- Observed behavior
- The user cannot find a feature to apply a new certificate-based digital signature within the iOS mobile app.
Verify whether your document requires a standard electronic signature (a drawn image of your signature) or a cryptographic digital signature (which requires a secure digital ID certificate). This guide addresses cryptographic digital signatures.
Use Adobe Acrobat on Desktop for Digital Signatures
Since the Acrobat Reader mobile app cannot add certificate-based digital signatures, you must transfer the file to a desktop computer to apply the signature securely.
The Acrobat Reader app for iOS (iPhone and iPad) can successfully view and validate existing digital signatures. However, it lacks the functionality to create or apply new digital certificates. To securely sign a document with a cryptographic digital ID, you need to transition to the desktop version of Adobe Acrobat.
Send the PDF document from your iPhone or iPad to your Windows or Mac computer using email, cloud storage services like iCloud or Google Drive, or Apple AirDrop.
Launch Adobe Acrobat Reader or Adobe Acrobat Pro on your desktop computer and open the PDF file you just transferred.
Navigate to the 'Tools' menu at the top of the screen, scroll down to the 'Forms & Signatures' section, and select 'Certificates'. Click on 'Digitally Sign' in the top toolbar.
Use your mouse to drag a rectangle where you want the signature to appear. Select your digital ID from the prompt, enter your password if required, and click 'Sign'. Finally, save the signed document.
Sign and Edit PDFs Effortlessly with WPS Office
WPS Office offers a powerful, user-friendly PDF toolkit that allows you to easily add electronic signatures, annotate, edit, and secure your PDF documents across multiple devices, including iOS, Android, Windows, and Mac.
- 1. Install and Open WPS Office: Download WPS Office from the App Store or the official website. Launch the app and open the PDF document you need to sign.
- 2. Access the Signature Tool: Tap on the 'Tools' menu at the bottom (on mobile) or the 'PDF Edit' tab (on desktop), then select the 'Fill & Sign' or 'Signature' option.
- 3. Create Your Signature: Choose to draw your signature on the screen, type your name using a styled font, or import an image of your physical signature.
- 4. Place and Save: Tap or click the exact location in the document where the signature should appear. Resize the signature box if necessary, then save your updated PDF.
Frequently Asked Questions
Can I draw a regular signature in Acrobat Reader on iOS?
Yes. While you cannot add cryptographic digital certificates on iOS, you can use the 'Fill & Sign' tool in the Acrobat Reader mobile app to draw, type, or insert an image of your standard electronic signature.
Why can't I add digital certificates on a mobile device?
Cryptographic digital signatures require access to secure digital ID files (.pfx or .p12) and complex validation processes. These features are currently optimized for desktop operating systems rather than mobile environments, mainly due to mobile OS security sandboxing restrictions.
How do I verify an existing digital signature on my iPhone?
When you open a digitally signed PDF in the Acrobat Reader mobile app, simply tap on the signature field. The app will display the signature properties and indicate whether the digital certificate is valid, unmodified, and trusted.
Is a drawn electronic signature legally binding?
In many jurisdictions, a standard electronic signature (like a drawn signature on a screen) is legally binding for most everyday business transactions. However, highly sensitive legal or government documents may strictly require a cryptographic digital signature. Always verify your local regulations.
