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Detect, block and quarantine malware with ZeroDay

Free antivirus for Windows 10 and 11, with no ads and no account.

Download ZeroDay Explore ZeroDay’s features

ZeroDay 1.0

Free for Windows 10 and 11. Out now.

What’s included
  • Real-time scanning
  • Ransomware protection
  • Web protection in every browser
  • Quarantine with clear reasons
  • Free for home and business

ZeroDay for Windows

It scans files as they arrive, keeps ransomware out of the folders you choose, and tells you why anything was quarantined. No account needed.

Explore ZeroDay’s features

Hashes first, files only with permission

ZeroDay checks a file’s fingerprint, not the file. Full files only leave your PC if you turn on sample sharing.

Read the privacy policy
On your PC
A SHA-256 hash is calculated
e3b0c44298fc1c149afbf4c8996fb92427ae41e4…
Sent to us
The hash, size, type and signer
Returned
clean score 2
Only if enabled
The full file, for deeper analysis

What ZeroDay includes

Real-time protection

New files are checked before they can run.

Scheduled scans

Quick or full, on a schedule or from the right-click menu.

Ransomware protection

Only apps you allow can change your protected folders.

Web protection

Known phishing and malware sites are blocked in any browser.

Quarantine

Detections are isolated, explained and can be restored.

Automatic updates

New detections arrive in the background, several times a day.

Download ZeroDay

Free for Windows 10 and 11.

Download About ZeroDay

Join the ZeroDay beta

Get early builds of ZeroDay before they are released.

Apply for the beta How the beta works