A keylogger is spyware that records what you type. That can include passwords, messages, searches, documents, and card numbers before the information ever reaches an encrypted website.
Does this affect you?
Use this for Windows PCs, Macs, and phones. Most keyloggers are software, but hardware versions can exist when someone has physical access to the computer.
How a keylogger works
The goal is quiet collection.
- Software keyloggers usually arrive through free downloads, cracked apps, phishing attachments, malicious links, or bundled installers.
- Once running, they listen for keystrokes at the operating-system level before the typed text appears where you expect it.
- They record more than passwords, including chats, searches, notes, documents, and personal details.
- The logs are sent to the attacker over the internet, often in bursts or on a schedule to avoid attention.
- Hardware keyloggers are less common now but can be plugged between a keyboard and computer by someone with physical access.
Signs worth checking
No single symptom proves a keylogger, but combinations matter.
- A computer becomes unusually slow without an obvious reason.
- Data usage spikes unexpectedly.
- Security software turns off, fails to update, or behaves strangely.
- Accounts show logins, password resets, or activity you do not recognize.
- Suspicious software appeared after a download, email attachment, or support call.
More control
Use a password manager
Autofill can reduce how often you type passwords key by key. It is not a complete defense against every kind of spyware, but it helps against basic keystroke capture.
Turn on multi-factor authentication
If a password is captured, MFA can still block access unless the attacker also has the second factor. Protect email, banking, and password manager accounts first.
Scan with reputable tools
Use Windows Security or a well-known security product. Avoid search ads and popups offering special keylogger removal tools because some are malicious themselves.
Sources
- CISA – Protecting Against Malicious Code (2025)
- Microsoft Support – Protect my PC from viruses (2025)
- Malwarebytes – What Is a Keylogger? (2025)