How to Sign a Document on Your Android Phone (Step-by-Step Guide)

Need to sign a document on your phone but don’t have access to a computer?

You can easily sign a PDF, Word document, or contract directly from your Android phone or tablet. Whether you're using Google Drive, Microsoft Word, Gmail, or another app, there are several simple ways to add your signature in just a few minutes.

Below, we’ll walk you through how to sign a document on your Android phone step by step — including how to sign PDFs, Word files, and documents sent by email.

How to Sign a Document on Your Android Phone

Follow these steps to sign a document using an eSignature app like Fill:

1. Download and install the Fill app from the Google Play Store.

2. Open the app and tap the “+” icon to upload or create a document.

3. Import your file from Google Drive, your device storage, Dropbox, or OneDrive.

4. Select Sign Yourself and tap the Sign tool.

5. Create your digital signature by drawing, typing, or uploading an image.

6. Drag and resize your signature into place.

7. Tap Done to save and export your signed document.

After signing your document, you can choose to download it to your device or send it to others. 

Once signed, you can no longer make changes to your document. If you preview the document, you can also see a string of characters at the bottom of every page. This string of characters represents a hash. Any change in the hash code means that your document has been modified, which nullifies the validity of the electronic signature you attached.

Can You Fill and Sign PDF Documents on Android?

Yes. Using your mobile phone to fill and sign PDF documents is possible, provided that you have an electronic signature app with a built-in PDF editor. If you search the Play Store and type “signature app,” you’ll find app offerings ranging from free to paid to freemium. It’s only a matter of choosing which app is best suited for your needs.

A good example is Fill. With this app, you can fill and sign PDFs from anywhere, at any time. It also uses bank-grade encryption to safeguard documents stored in the cloud. With the help of this app, you can sign contracts without printing them on paper.

How to Sign a PDF on Your Android Phone

If you need to sign a PDF:

1. Open the PDF file on your device.
2. Import it into your eSignature app.
3. Add your signature using the Sign tool.
4. Save and export the file.

Using a dedicated esignature app ensures your document remains secure and tamper-evident after signing.

How to Sign a Word Document on Android

To sign a Microsoft Word (.DOC or .DOCX) file:

1. Open the Microsoft Word document you want to sign on your Android device.
2. Navigate to the toolbar and select File.
3. Save the document in the format of your choosing. Take note of the file’s location on your device.
4. Next, open the Fill app and import your document.
5. At this point, you can follow steps 4 to 9 from the previous section to finish creating and applying your esignature.

As you can see, Fill can be a valuable addition to your workflow. With this feature-rich app, all you need to do is create and edit a document on Word, then open the file on Fill to finish the signing process. It’s effortless and could take hours off your usual routine. You can also convert Word files to PDF before signing if preferred.

How to Sign Documents Sent to Your Phone by Email

If someone emails you a document:

1. Download the attachment from Gmail or another email app.
2. Open it in your signing app.
3. Add your signature.
4. Save and reply with the signed file.

Many apps integrate directly with Google Drive and Gmail for faster signing.

How to Sign Documents With Google Docs on Android

Google Docs is another word processing software similar to Microsoft Word. It is an increasingly popular solution for creating and sharing documents. It also integrates with other Google apps like Drive, Sheets, and more. 

Follow the steps below to sign documents on Google Docs with Fill.

1. Open Google Docs, and find the document you want to sign.
2. Make your final edits and ensure the file is good to go.
3. As Google automatically syncs your files, the document will appear on your Google Drive. Open the app and select the three-dot symbol beside the file name.
4. Next, select Open In. Choose Fill from the list of the available apps.
5. Fill should open on your device. You can now create a digital signature and request esignatures from other parties.
6. To start signing on your Android device, follow the steps outlined in the short Fill guide above.

Fill features powerful third-party integrations with cloud-based services. You already know about Google Drive, but it also connects with apps like Dropbox, OneDrive, and iCloud. With Fill, you can be sure that you can sign documents electronically wherever you are.

Can You Sign Documents on Any Phone?

Yes. While the steps above apply to Android devices, the process of signing a document on your phone is similar across most smartphones.

If you’re using an iPhone, you can download Fill for iOS and read our complete guide here:

👉 How to sign documents on an iPhone‍

Why Use Your Android to Sign Documents on the Go?

Using your Android phone to sign documents is advantageous, especially for people who live a busy lifestyle. Instead of making that long commute to the office, you can use your phone to fill out and sign a form that you’ve forgotten. You can also go on trips while dealing with urgent business transactions. It also helps improve your level of productivity since you’re able to accomplish tasks despite being away from your work desk. 

By having the flexibility and the freedom to sign documents on your Android phone or tablet, you can take control of your time while minimizing the risk of work-related stress.

Sign Documents on Your Android Phone Anytime, Anywhere

Now you know how to sign a document on your Android phone — whether it’s a PDF, Word file, or an attachment sent by email. With the right tools, you can add a legally binding signature in just a few minutes without printing, scanning, or using a computer.

Signing documents on your phone helps you stay productive while traveling, working remotely, or handling urgent paperwork. It also reduces paper usage and speeds up approval processes when multiple parties need to sign.

If you regularly sign contracts, forms, or agreements on your mobile device, using a secure eSignature app like Fill can make the process even faster and more reliable.

You can download Fill for Android from the Google Play Store and start signing documents directly from your phone.