Technical Support

Sales Inquiries

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Report a Virus

Contact Virus Lab

If you’ve encountered a suspicious file or received what you think is a false-positive virus alert, please contact our Virus Lab for an analysis.

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Global Offices

Contact one of our global offices

Czech Republic (HQ)

AVAST Software s.r.o.
Trianon Office Building
Budejovicka 1518/13a
140 00, Prague 4
Czech Republic

Phone: 00 420 274 005 777
Fax: 00 420 274 005 888

Registration Number: 27636917
VAT Number: CZ27636917

Registered in the Commercial Register,
administered by the Municipal court in
Prague, section C, file number 222757


AVAST Software, Inc.
Redwood City, CA


AVAST Software Deutschland GmbH


AVAST Software (ASIA) Limited
Hong Kong

Your browser is obsolete.

1. On 8 April 2014, Microsoft stops support for Internet Explorer browsers running on Windows XP. This will put your computer and data, such as credit card and online banking details, at greater risk to hackers and malware.

2. Several browser alternatives exist, but we at AVAST use and recommend Chrome, as we find it to be the most-secure option available.