Chromebooks are built to resist viruses, but you should still check

Chromebooks are harder to infect than Windows or Mac computers because Chrome OS runs everything inside a sandbox — a locked container that stops malware from reaching your system files. But you can still pick up malicious software through downloads, fake websites, or compromised browser extensions. The good news is that checking for viruses on a Chromebook takes minutes and uses tools built into the system.

Chrome OS scans for threats automatically in the background, but you can run a manual scan whenever you want. You do not need to install antivirus software — Chrome OS does not allow it, and it does not need it. Instead, you use the Security Check feature in Chrome settings, review your installed extensions, and clear your browsing data if something feels wrong.

Key Takeaways

  • Chrome OS scans for malware automatically, but you can run a manual security check through Chrome settings in under a minute.
  • Malicious browser extensions are the most common threat on Chromebook, so review your extensions list and remove anything you do not recognize.
  • Clearing your browsing data and cache removes tracking cookies and temporary files that malware sometimes uses to hide.
  • If your Chromebook is acting slow or showing pop-ups, restart it first — most performance problems clear on reboot.
  • A full factory reset wipes your Chromebook completely and removes any persistent malware, though you will lose all local files.

Run a manual security check in Chrome settings

Open Chrome and go to Settings (the three-line menu in the top right corner). Click Security and privacy on the left side, then select Security. You will see a section called Security Check with a blue button that says Check now. Click it.

Chrome will scan your system for malware, check your passwords against known data breaches, and verify that your browser is up to date. The scan takes about 30 seconds. If Chrome finds a problem, it will tell you exactly what it found and give you a button to remove it. If everything is clean, you will see a green checkmark and the message "Your device is secure."

This scan checks for malware that Chrome OS knows about. It is not a deep system scan like you would run on Windows — it is a quick check of known threats. If your Chromebook is behaving strangely even after a clean security check, the problem is usually a bad extension or corrupted cache, not a virus.

Review and remove suspicious browser extensions

Extensions are small programs that add features to Chrome. They are also the easiest way for malware to get onto your Chromebook. Go to Settings, click Extensions on the left, and you will see every extension installed on your device. Look through the list and remove anything you do not remember installing or anything from a source you do not trust.

To remove an extension, click the Remove button next to it. Chrome will ask you to confirm — click Remove again. The extension is gone immediately. If you are not sure whether an extension is safe, search for its name online plus the word "malware" or "scam." If other people have reported it as dangerous, you will find those reports quickly.

Pay special attention to extensions that promise to speed up your browser, change your search engine, or modify how websites look. These are common hiding places for malware. Legitimate extensions come from the Chrome Web Store and have clear descriptions of what they do. If an extension's purpose is vague or it asks for permission to access all websites, remove it.

Clear your browsing data and cache

Malware sometimes hides in your browser cache — the temporary files Chrome stores to load websites faster. Clearing this data removes those files and also deletes cookies that track your activity across websites. Open Chrome and press Ctrl + Shift + Delete (or Command + Shift + Delete on older Chromebooks). The Clear Browsing Data window will open.

At the top, make sure the time range is set to All time. Then check the boxes next to Cookies and other site data and Cached images and files. Leave the other options unchecked unless you want to delete your browsing history and saved passwords too. Click Clear data. This takes a few seconds.

After clearing your cache, restart Chrome by closing all windows and opening it again. If your Chromebook was running slowly or showing unexpected pop-ups, this often fixes the problem. The pop-ups usually come from websites you visited, not from a virus, but clearing your cache stops them from appearing.

Restart your Chromebook to clear temporary problems

A restart fixes most Chromebook problems, including slowness, freezing, and strange behavior. Press the power button on your Chromebook, wait for it to shut down completely, then press the power button again to turn it back on. The whole process takes about two minutes.

When your Chromebook restarts, Chrome OS reloads everything from scratch. Temporary files are cleared, stuck processes are stopped, and your system memory is reset. If malware was running in the background, a restart often stops it. If the problem comes back after a restart, it is more likely to be a bad extension or corrupted data than a virus.

Restart your Chromebook at least once a week even if nothing is wrong. This keeps the system running smoothly and clears out temporary files that build up over time.

Check your Chromebook account and connected devices

Go to myaccount.google.com in Chrome and sign in with your Google account. Click Security on the left side, then scroll down to Your devices. You will see a list of every device signed into your Google account. Look for any devices you do not recognize or do not use anymore.

If you see a device you do not own, click it and select Remove. This signs that device out of your Google account and stops it from accessing your email, photos, and other data. If someone else has access to your account, changing your Google password is the next step. Go back to the Security page and click Password, then enter a new, strong password that you have not used before.

Also check the Recent security events section on the same page. Google logs every time someone signs into your account from a new location or device. If you see a sign-in from a place you have never been, your account may have been compromised.

Perform a factory reset if malware persists

If your Chromebook is still acting strange after running a security check, clearing your cache, removing suspicious extensions, and restarting, a factory reset is the last step. This wipes your Chromebook completely and reinstalls Chrome OS from scratch. Everything on your device will be deleted, including files you saved locally, so back up anything important to Google Drive first.

To reset your Chromebook, go to Settings, click About Chrome OS on the left, then click Powerwash. Chrome will ask you to confirm. Click Powerwash again. Your Chromebook will restart and erase everything. When it boots back up, you will see the setup screen like the first time you turned it on. Sign in with your Google account, and your apps and files from Google Drive will sync back automatically.

A factory reset removes any malware that survived other cleaning steps because it deletes everything and reinstalls the operating system. After a reset, your Chromebook will run like new. If problems come back after a reset, the issue is probably not malware — it is more likely a hardware problem or an issue with your Google account.

Frequently Asked Questions

Can Chromebooks get viruses?

Chromebooks are much harder to infect than Windows or Mac computers because Chrome OS runs everything in a sandbox. Malware can still reach your Chromebook through malicious extensions, fake downloads, or compromised websites, but it cannot access your system files or spread to other devices. Most threats on Chromebook are browser-based, not system-based.

Do I need to install antivirus software on my Chromebook?

No. Chrome OS does not allow you to install antivirus software, and you do not need it. Chrome OS has built-in malware protection that scans automatically. Installing antivirus software on Windows or Mac makes sense, but Chromebooks are designed differently and handle security themselves.

Why is my Chromebook running slowly?

Slowness is usually caused by too many browser tabs open, a full hard drive, or a bad extension — not by malware. Try closing unused tabs, clearing your cache, and removing extensions you do not use. If your Chromebook is still slow after that, restart it. If slowness continues after a restart and a security check, a factory reset may help.

What should I do if I see a pop-up warning about a virus?

Pop-ups claiming your device has a virus are almost always fake. They are designed to scare you into clicking them or calling a fake support number. Close the pop-up by clicking the X button, clear your browsing data, and remove any extensions you recently installed. Do not call any number shown in the pop-up.

Will a factory reset delete my Google Drive files?

No. A factory reset only deletes files stored locally on your Chromebook. Files in Google Drive, Gmail, and other Google services stay in your account and sync back when you sign in again after the reset. Back up any important local files to Google Drive before you reset, just to be safe.