To manually activate the premium features in Avast One, you need to sign in to the application with an Avast Account that contains a valid Avast One subscription. The instructions in this article explain how to sign in to Avast One with an Avast Account.
Activate via Avast Account
- Double-click the Avast One Essential icon on your Windows desktop to open the application.
- Click Account in the left panel on the main Avast One screen.
- Select Sign in. Google Chrome opens.
If you don't yet have an Avast Account, click Create account to activate Avast One by creating a new Avast Account with the email address that you provided during purchase. - Follow the relevant step below in Google Chrome:
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- Enter the credentials for the Avast Account that contains your Avast One subscription, then click Continue.
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- When prompted by Google Chrome to re-open Avast Antivirus, click Open Avast Antivirus.
- Double-click the Avast One Essential icon on your Windows desktop to open the application.
- Click Account in the left panel on the main Avast One screen.
- Select Sign in. Mozilla Firefox opens.
If you don't yet have an Avast Account, click Create account to activate Avast One by creating a new Avast Account with the email address that you provided during purchase.
- Follow the relevant step below in Mozilla Firefox:
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- Enter the credentials for the Avast Account that contains your Avast One subscription, then click Continue.
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- When prompted by Mozilla Firefox to re-open Avast Antivirus, follow the steps below:
- Select Choose Application.
- Ensure Avast Antivirus is selected, then click Open Link.
- Select Choose Application.
- Double-click the Avast One Essential icon on your Windows desktop to open the application.
- Click Account in the left panel on the main Avast One screen.
- Select Sign in. Microsoft Edge opens.
If you don't yet have an Avast Account, click Create account to activate Avast One by creating a new Avast Account with the email address that you provided during purchase.
- Follow the relevant step below in Microsoft Edge:
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- Enter the credentials for the Avast Account that contains your Avast One subscription, then click Continue.
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- When prompted by Microsoft Edge to re-open Avast Antivirus, click Open.
- Double-click the Avast One Essential icon on your Windows desktop to open the application.
- Click Account in the left panel on the main Avast One screen.
- Select Sign in. Avast Secure Browser opens.
If you don't yet have an Avast Account, click Create account to activate Avast One by creating a new Avast Account with the email address that you provided during purchase.
- Follow the relevant step below in Avast Secure Browser:
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- Enter the credentials for the Avast Account that contains your Avast One subscription, then click Continue.
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- When prompted by Avast Secure Browser to re-open Avast Antivirus, click Open Avast Antivirus.
Your Avast One subscription is now active. If activation is unsuccessful, refer to the Activate via sign-in key section below.
The expiration date of your subscription appears via 
Account ▸ Subscription or in your Avast Account. You can activate your subscription on the number of devices you specified when making the purchase.
Activate via sign-in key
If activation via Avast Account fails, you can activate Avast One using the sign-in key from your web browser. To use this alternative activation method, follow the steps below:
- Double-click the Avast One Essential icon on your Windows desktop to open the application.
- Click Account in the left panel on the main Avast One screen.
- Select Sign in. Your default web browser opens.
- Follow the relevant step below in your default web browser:
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- Enter the credentials for the Avast Account that contains your Avast One subscription, then click Continue.
- Check that the listed Avast Account is the one that contains your Avast One subscription, then click Yes, continue. Alternatively, click Sign in as someone else.
- Click Get a sign-in key instead.
- Click Copy to clipboard.
- Go to Avast One, and click enter the sign-in key from your browser.
- Click in the text box, then press the
Ctrlkey and theVkey on your keyboard simultaneously to paste the sign-in key. Click Continue.
Your Avast One subscription is now active. If activation is unsuccessful, refer to the Still need help? section below.
The expiration date of your subscription appears via Account ▸ Subscription or in your Avast Account. You can activate your subscription on the number of devices you specified when making the purchase.
To activate the premium features in Avast One, you need to sign in to the application with an Avast Account that contains a valid Avast One subscription. The instructions in this article explain how to sign in to Avast One with an Avast Account.
Activate via Avast Account
- Click Go ▸ Applications in the Apple menu bar, then double-click the Avast One icon to open the application.
- Click Account in the left panel on the main Avast One screen.
- Select Sign in.
If you don't yet have an Avast Account, click Create account to activate Avast One by creating a new Avast Account with the email address that you provided during purchase. - Enter your Avast Account credentials and click Sign in.
Your Avast One subscription is now active. If activation is unsuccessful, refer to the Still need help? section below.
The expiration date of your subscription appears via 
Account ▸ Subscription or in your Avast Account. You can activate your subscription on the number of devices you specified when making the purchase.
To activate the premium features in Avast One, refer to the instructions in the relevant section below:
- Activate via Avast Account: applies if you purchased Avast One from the official Avast website, or via another Avast application on your Windows PC or Mac.
- Restore via Google Play: applies if you purchased Avast One via Google Play Store.
Activate via Avast Account
- Tap the Avast One icon on the Home screen of your device. The app opens.
- Tap Profile in the bottom panel.
- Tap Sign in.
- Enter your Avast Account credentials, then select Continue.
If you don't yet have an Avast Account, tap Create account to activate Avast One by creating a new Avast Account with the email address that you provided during purchase.
Your Avast One subscription is now active. If activation is unsuccessful, refer to the Still need help? section below.
The expiration date of your subscription appears via 
Profile ▸ Subscription or in your Avast Account. You can activate your subscription on the number of devices you specified when making the purchase.
Restore via Google Play
Avast One subscriptions purchased via Google Play Store are activated automatically on the Android device you used to make the purchase. The instructions below are useful if you change or reset your device, or automatic activation via Google Play Store is unsuccessful.
To restore your Avast One subscription via Google Play Store:
- Ensure you are signed in to Google Play Store with the same Google Account that you used to purchase Avast One. For instructions on how to verify this, refer to the following article:
- Tap the Avast One icon on the Home screen of your device. The app opens.
- Tap Profile in the bottom panel.
- Tap Add or update subscription ▸ Restore from Google Play.
The app automatically retrieves and activates your Avast One subscription from Google Play Store.
If activation is unsuccessful, refer to the following article:
To activate the premium features in Avast One, refer to the instructions in the relevant section below:
- Activate via Avast Account: applies if you purchased Avast One from the official Avast website, or via another Avast application on your Windows PC or Mac.
- Restore via the App Store: applies if you purchased Avast One via the App Store.
Activate via Avast Account
- Tap the Avast One icon on the Home screen of your device. The app opens.
- Tap Profile in the bottom panel.
- Tap Sign in.
If you don't yet have an Avast Account, tap Create account. - Enter your Avast Account credentials, then tap Confirm.
Your Avast One subscription is now active. If activation is unsuccessful, refer to the Still need help? section below.
The expiration date of your subscription appears via 
Profile ▸ Subscription or in your Avast Account. You can activate your subscription on the number of devices you specified when making the purchase.
Restore via the App Store
Avast One subscriptions purchased via the App Store are activated automatically on the iOS device you used to make the purchase. The instructions below are useful if you change or reset your device, or automatic activation via the App Store is unsuccessful.
To restore your Avast One subscription via the App Store:
- Ensure you are signed in to the App Store with the same Apple ID that you used to purchase Avast One. For instructions on how to verify this, refer to the following article:
- Tap the Avast One icon on the Home screen of your device. The app opens.
- Tap Profile in the bottom panel.
- Tap Buy or restore a subscription.
- Select Restore from App Store.
The app automatically retrieves and activates your Avast One subscription from the App Store.
If activation is unsuccessful, refer to the following article:
Still need help?
The information below explains how to resolve some of the most common activation issues:
- Ensure that your Avast One subscription appears in your Avast Account. To verify this, sign in to your Avast Account in your web browser and click the Subscriptions tile to see a list of the linked subscriptions.
- If your Avast One subscription does not appear in your Avast Account, you can manually add the subscription. For instructions, refer to the following article:
- Completely uninstall Avast One from your device, then reinstall it again. This can resolve issues that are caused by incorrect configuration or corrupted files. We recommend following the exact steps in the following articles: After reinstallation, try activating your subscriptionactivating your subscriptionactivating your subscriptionactivating your subscription again.
If the issue persists, contact Avast Support.
Further recommendations
To learn more about Avast One, refer to the following article:
- Avast One - Frequently Asked Questions
- Avast One - Frequently Asked Questions
- Avast One - Frequently Asked Questions
- Avast One - Frequently Asked Questions
For instructions on how to use Avast One, refer to the following article:
- Avast One 21.x for Windows
- Avast One 21.x for Mac
- Avast One 2.x for Android
- Avast One 2.x for iOS
- Microsoft Windows 11 Home / Pro / Enterprise / Education
- Microsoft Windows 10 Home / Pro / Enterprise / Education - 32 / 64-bit
- Microsoft Windows 8.1 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 8 / Pro / Enterprise - 32 / 64-bit
- Microsoft Windows 7 Home Basic / Home Premium / Professional / Enterprise / Ultimate - Service Pack 1 with Convenient Rollup Update
- Apple macOS 12.x (Monterey)
- Apple macOS 11.x (Big Sur)
- Apple macOS 10.15.x (Catalina)
- Apple macOS 10.14.x (Mojave)
- Apple macOS 10.13.x (High Sierra)
- Google Android 6.0 (Marshmallow, API 23) or later
- Apple iOS 13.0 or later
