How to sign out of the Kindle app

Since the Kindle mobile app for iPhone / iPad and Android does not have a “Sign Out” button, this function is analogous to the procedure for “deauthorizing” the device. Deauthorizing a device will disconnect it from the Amazon account, blocking the ability to make purchases through that account and view purchased content. Log in after de-authorization to link the device to a different account or the same one. An Android device can be deauthorized through an Amazon account, thereby preventing other users from accessing your account if the device is ever lost or stolen.

Steps

Method 1 of 3: Deauthorize the Kindle App on iPhone / iPad

Step 1. Launch the Kindle app using one of two methods

Scroll through the list of apps until you find the Kindle app, which has an icon that looks like a black silhouette of a reading person on a blue background.
Swipe right on the desktop to open the search function. Click on the search bar, enter "Kindle" and tap the app when it appears in the bottom menu.

Step 2. Click on the menu icon (three vertical lines) in the upper left corner of the screen

If you have an iPad, skip this step.
If a book is open in the app, go to the settings menu and select "Library" to return to the home screen.

Step 3. Scroll to the very bottom of the menu and open the "Settings" section

If you have an iPad, tap the Settings icon (white gear) in the lower-right corner of the screen

Step 4. Find the "Registration" section and click on "Update"

This will take you to the deauthorization page.

Step 5. Click on Unregister this device

You will receive the following notification: "Canceling registration will delete all downloaded content from this device, are you sure you want to continue?" If you link the device to the same account, all downloaded content will return to the library.

Step 6. Click "OK" to confirm "log out" from your account

The device will no longer be linked to the Amazon account it was registered with.

Step 7. Log in to the Kindle app to enroll your device

Tap the Email or Phone Number field and enter your email address or mobile phone number associated with your Amazon account.
Tap the Password field and enter the password for your Amazon account.
Click Sign In. The device is automatically authorized to your Amazon account.

Method 2 of 3: Deauthorize Kindle on Android

Step 1. Launch the Kindle app

Step 2. Tap the menu button (miniature Kindle logo) in the upper left corner of the screen

If a book is open in the app, go to the settings menu and select "Library" to return to the home screen

Step 3. Find the "Account" section and click on "Settings"

Step 4. Click on the "Unregister this device" option in the "Register" section to "log out" of your account

The device will no longer be linked to the Amazon account it was registered with.

Step 5. Log in to the Kindle app to register your device

Launch the Kindle app.
Click on "Start Reading".
Enter the email address or mobile number associated with your Amazon account.
Enter your Amazon account password.
Click Sign In. The device is automatically authorized to your Amazon account.

Method 3 of 3: Remotely Deauthorize an Android Device

Step 1. Go to Amazon website

Android users can register their device through the Amazon app store. When you download and enter the application, the device is automatically authorized and displayed in the "Your devices" list. If your device is lost or stolen, this feature will allow you to disconnect your device from your Amazon account.