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Free antivirus for Windows

Protection from malware, ransomware and bad websites. Free for home and business, with no account.

Download for Windows System requirements

Version 1.0 for Windows 10 and 11, x64 and ARM64

Real-time protection

Every new file is checked before it can run. Known malware is caught by signature, new threats by how they behave. Bad sites are blocked in every browser.

Protection history Today
invoice_0921.pdf.exeQuarantined
free-codec-pack.msiBlocked
setup_x64.exeAllowed, signed
holiday-photos.zip, 214 filesAllowed
login-verify.example.topSite blocked

Ransomware protection

Only apps you allow can change your protected folders, so ransomware can’t encrypt them. Documents, Pictures and Desktop are covered from the start.

Protected folders Add folder
C:\Users\sam\Documentsprotected
C:\Users\sam\Picturesprotected
C:\Users\sam\Desktopprotected
D:\Projectsprotected
Change blockedupdater_svc.exe tried to modify Documents\taxes-2026.xlsx
Keep blockingAllow onceAlways allow

Quarantine

Detections are locked away where they can’t run. Each one says what was found and why. If we got it wrong, restore it in one click.

invoice_0921.pdf.exemalicious, 97
Why it was flagged
  • It is a program with a PDF icon and a double file extension
  • It tries to delete Windows shadow copies
  • It matches the Trojan.Win64.Agent family
Score
cleansuspiciousmalicious
Keep in quarantineRestoreReport as safe

Download ZeroDay

One installer for x64 and ARM64. It keeps itself up to date.

ZeroDay 1.0 for Windows

Version1.0
RequiresWindows 10 or 11
PriceFree
Download installer

By downloading you agree to the ZeroDay EULA and Privacy Policy.

WindowsWindows 10 (22H2) and Windows 11
Available
macOSApple silicon and Intel
In development
LinuxDebian, Ubuntu and Fedora packages
In development
Want new builds early?Apply for the ZeroDay beta program
Beta program

System requirements

Operating system
Windows 10 (22H2) or Windows 11, 64-bit
Processor
x64 or ARM64, 2 cores or more
Memory
4 GB RAM
Disk space
1 GB free for the app, detection updates and quarantine
Network
An internet connection for reputation lookups and updates
Other antivirus
Only one real-time antivirus should run at a time

Frequently asked questions

Is ZeroDay really free?

Yes, at home and at work, on as many PCs as you like. There’s no paid version.

What does ZeroDay send to your servers?

A file’s SHA-256 hash, size, type and signer. Full files are only sent if you turn on sample sharing. Details are in the Privacy Policy.

Does it work alongside Microsoft Defender?

Windows runs one real-time antivirus at a time. While ZeroDay is on, Defender steps back. Uninstall ZeroDay and Defender switches itself back on.

ZeroDay flagged a file I trust. What should I do?

Open Quarantine, pick the file and choose Restore, then Report as safe. You can also email support@plasmatic.dev.

How do updates work?

Automatically. New detections arrive several times a day, and app updates apply when you restart.

How do I uninstall it?

Windows Settings, then Apps, then ZeroDay, then Uninstall. Restore anything you need from Quarantine first.