This wikiHow teaches you how to add a digital signature to a PDF document. You can add a signature using the Adobe Reader program on Windows and Mac computers, or the Preview application built into Mac computers. If you want to sign PDF documents on your iPhone or Android device, Adobe's Fill & Sign app is a great choice.
Step
Method 1 of 3: Using Adobe Reader on a Windows or Mac Computer
![Digitally Sign PDF Documents Step 1 Digitally Sign PDF Documents Step 1](https://i.how-what-advice.com/images/002/image-5982-1-j.webp)
Step 1. Install Adobe Reader on the computer if it is not already available
You can install this free PDF reader from Adobe by following these steps:
- Visit https://get.adobe.com/reader/ via your computer's web browser.
- Uncheck the program in the "Optional offer" column.
- Click " Install now " or " Download ”.
- Double-click the downloaded installation file.
- Follow the installation prompts.
![Digitally Sign PDF Documents Step 2 Digitally Sign PDF Documents Step 2](https://i.how-what-advice.com/images/002/image-5982-2-j.webp)
Step 2. Open the PDF file in Adobe Reader
To open it:
- Windows - Right-click the PDF file you want to sign, select “ Open with, and click " Adobe Acrobat Reader DC ”.
- Mac - Click the PDF file you want to sign, click “ File ", choose " Open With, and click " Adobe Acrobat Reader DC ”.
![Digitally Sign PDF Documents Step 3 Digitally Sign PDF Documents Step 3](https://i.how-what-advice.com/images/002/image-5982-3-j.webp)
Step 3. Click the Tools tab
This tab is at the top of the program window.
![Digitally Sign PDF Documents Step 4 Digitally Sign PDF Documents Step 4](https://i.how-what-advice.com/images/002/image-5982-4-j.webp)
Step 4. Click Fill & Sign
It's a purple icon at the top of the equipment list.
![Digitally Sign PDF Documents Step 5 Digitally Sign PDF Documents Step 5](https://i.how-what-advice.com/images/002/image-5982-5-j.webp)
Step 5. Click Sign
You can see this option in the top right corner of the page. A drop-down menu will appear after that.
![Digitally Sign PDF Documents Step 6 Digitally Sign PDF Documents Step 6](https://i.how-what-advice.com/images/002/image-5982-6-j.webp)
Step 6. Click Add Signature
This option is in the drop-down menu. After that, a signature form will be opened.
![Digitally Sign PDF Documents Step 7 Digitally Sign PDF Documents Step 7](https://i.how-what-advice.com/images/002/image-5982-7-j.webp)
Step 7. Enter your first name and last name
Type in a name to create a “classic” signature version of your name.
![Digitally Sign PDF Documents Step 8 Digitally Sign PDF Documents Step 8](https://i.how-what-advice.com/images/002/image-5982-8-j.webp)
Step 8. Click Apply
It's at the bottom of the menu. After that, the signature will be saved and the PDF document will be reopened.
![Digitally Sign PDF Documents Step 9 Digitally Sign PDF Documents Step 9](https://i.how-what-advice.com/images/002/image-5982-9-j.webp)
Step 9. Select the place where you want to add a signature
Find the place where you want to add a signature, then click the place to add a signature. After that, your signature will be displayed on the PDF file.
![Digitally Sign PDF Documents Step 10 Digitally Sign PDF Documents Step 10](https://i.how-what-advice.com/images/002/image-5982-10-j.webp)
Step 10. Save the signed version of the document
Press Ctrl+S (Windows) or Command+S (Mac) to bring up the " Save As " window, then select a save location and rename the file (if necessary) before clicking the “button Save ”.
Method 2 of 3: Using Preview on a Mac
![Digitally Sign PDF Documents Step 11 Digitally Sign PDF Documents Step 11](https://i.how-what-advice.com/images/002/image-5982-11-j.webp)
Step 1. Open the PDF file in Preview
The Preview app is the Mac's built-in PDF viewer. You can open a PDF file in Preview with these steps:
- Single-click the PDF file to select it.
- Click " File ” on the menu bar.
- Choose " Open With ” from the “File” drop-down menu.
- Click " Preview ” on the pop-out menu.
![Digitally Sign PDF Documents Step 12 Digitally Sign PDF Documents Step 12](https://i.how-what-advice.com/images/002/image-5982-12-j.webp)
Step 2. Click the “Show Markup” icon
This icon looks like a pen tip inside a circle, and is displayed next to the search field. The toolbar is at the top of the Preview window.
![Digitally Sign PDF Documents Step 13 Digitally Sign PDF Documents Step 13](https://i.how-what-advice.com/images/002/image-5982-13-j.webp)
Step 3. Click the “Signature” icon
This icon is in the toolbar. After that, a drop-down menu will be displayed.
![Digitally Sign PDF Documents Step 14 Digitally Sign PDF Documents Step 14](https://i.how-what-advice.com/images/002/image-5982-15-j.webp)
Step 4. Click the Trackpad tab
This tab is at the top of the drop-down menu.
- If you're using an iMac, select the “ Camera ”.
- If you have saved the signature, click “ Create Signature ” at the bottom of the drop-down menu first to create a new signature (or choose an existing one and skip the next two steps).
![Digitally Sign PDF Documents Step 15 Digitally Sign PDF Documents Step 15](https://i.how-what-advice.com/images/002/image-5982-16-j.webp)
Step 5. Draw the signature
Use your finger on the trackpad to create the signature the way you want the document to appear. After that, you can see the created signature in the drop-down menu.
If you're using a webcam on your iMac, create a signature on a blank sheet of paper and take a photo of the signature using the camera
![Digitally Sign PDF Documents Step 16 Digitally Sign PDF Documents Step 16](https://i.how-what-advice.com/images/002/image-5982-17-j.webp)
Step 6. Click Done
It's at the bottom of the drop-down menu.
![Digitally Sign PDF Documents Step 17 Digitally Sign PDF Documents Step 17](https://i.how-what-advice.com/images/002/image-5982-18-j.webp)
Step 7. Add the signature to the PDF file
Click the "Signatures" icon
then select a signature. You can drag it to where you want to add a signature afterwards.
![Digitally Sign PDF Documents Step 18 Digitally Sign PDF Documents Step 18](https://i.how-what-advice.com/images/002/image-5982-20-j.webp)
Step 8. Save the job
Click the menu " File, then select " Save ” to save the document. Your PDF file now contains the signature.
Method 3 of 3: Using Adobe Fill & Sign on Mobile
![Digitally Sign PDF Documents Step 19 Digitally Sign PDF Documents Step 19](https://i.how-what-advice.com/images/002/image-5982-21-j.webp)
Step 1. Install the Adobe Fill & Sign application
Adobe Fill & Sign is a free mobile app for iPhone and Android devices. To install it, follow these steps:
-
iPhone - Open
App Store, touch " Search ”, touch the search field, type in adobe fill and sign, select “ Search ", touch " GET ” next to “Adobe Fill & Sign”, and enter your Apple ID or scan Touch ID when prompted.
-
Android - Open
Google Play Store, tap the search bar, type in adobe fill and sign, tap “ Adobe Fill & Sign: Easy PDF Form Filler ” from the search results, select “ INSTALL, and touch " ACCEPT ” when prompted.
![Digitally Sign PDF Documents Step 20 Digitally Sign PDF Documents Step 20](https://i.how-what-advice.com/images/002/image-5982-24-j.webp)
Step 2. Open Adobe Fill & Sign
Touch the button “ OPEN ” in the App Store or Google Play Store window, or tap the purple Fill & Sign icon on the home screen (iPhone) or page/app drawer (Android).
![Digitally Sign PDF Documents Step 21 Digitally Sign PDF Documents Step 21](https://i.how-what-advice.com/images/002/image-5982-25-j.webp)
Step 3. Touch Select a form to fill out
It's at the top of the page. After that, the menu will be displayed.
![Digitally Sign PDF Documents Step 22 Digitally Sign PDF Documents Step 22](https://i.how-what-advice.com/images/002/image-5982-26-j.webp)
Step 4. Touch File Browser
This option is in the menu. After that, the Files app on the iPhone will open.
On the Android device, touch “ From PDF File ” on the menu.
![Digitally Sign PDF Documents Step 23 Digitally Sign PDF Documents Step 23](https://i.how-what-advice.com/images/002/image-5982-27-j.webp)
Step 5. Touch the Browse tab
It's a tab in the lower-right corner of the screen.
Skip this step for Android users
![Digitally Sign PDF Documents Step 24 Digitally Sign PDF Documents Step 24](https://i.how-what-advice.com/images/002/image-5982-28-j.webp)
Step 6. Select the PDF file
Go to the folder where you want to sign the PDF file, then touch the file to select it. After that, the PDF file will be opened in Adobe Fill & Sign.
![Digitally Sign PDF Documents Step 25 Digitally Sign PDF Documents Step 25](https://i.how-what-advice.com/images/002/image-5982-29-j.webp)
Step 7. Touch the “Fill & Sign” icon
This pen icon is at the bottom of the screen (iPhone) or the top of the screen (Android). A new menu will be opened after that.
You may need to touch an area outside the tutorial window to end the displayed tutorial
![Digitally Sign PDF Documents Step 26 Digitally Sign PDF Documents Step 26](https://i.how-what-advice.com/images/002/image-5982-30-j.webp)
Step 8. Touch Create Signature
This option is in the menu. After that, the signature field will be displayed.
![Digitally Sign PDF Documents Step 27 Digitally Sign PDF Documents Step 27](https://i.how-what-advice.com/images/002/image-5982-31-j.webp)
Step 9. Draw your signature
Touch and drag your finger over the signature field to create a signature of your name.
![Digitally Sign PDF Documents Step 28 Digitally Sign PDF Documents Step 28](https://i.how-what-advice.com/images/002/image-5982-32-j.webp)
Step 10. Touch Done
It's in the upper-right corner of the screen. After that, the signature will be saved and added to the document.
![Digitally Sign PDF Documents Step 29 Digitally Sign PDF Documents Step 29](https://i.how-what-advice.com/images/002/image-5982-33-j.webp)
Step 11. Change the signature position
Touch and drag the signature to select the desired location.
![Digitally Sign PDF Documents Step 30 Digitally Sign PDF Documents Step 30](https://i.how-what-advice.com/images/002/image-5982-34-j.webp)
Step 12. Share the document
If you want to send a signed PDF document, touch the " Share " icon
(iPhone) or "Share"
(Android), then select the desired file sharing method (e.g. via an e-mail application) and fill in the message fields as needed.
For example, if you want to send a PDF file via email, touch “ Share ”, select the desired email manager application, enter the recipient's email address, fill in the subject and message fields, then tap “ Send ”.
![Digitally Sign PDF Documents Step 31 Digitally Sign PDF Documents Step 31](https://i.how-what-advice.com/images/002/image-5982-37-j.webp)
Step 13. Touch Done
It's in the upper-right corner of the screen. After that, the PDF document will be saved.