Technical Support

Sales Inquiries

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Contact Sales Support Business


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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: 02176475
VAT Number: CZ02176475

Registered in the Commercial Register,
administered by the Municipal court in
Prague, section C, file number 216540


AVAST Software, Inc.
Redwood City, CA


AVAST Software Deutschland GmbH

South Korea

Timothy S.L. Choi
Korea Sales Director
Avast Software (ASIA) Limited.
Suite 2715, 27F Trade Tower
511, Young Dong Street, Gangnam-gu
Seoul Korea 135-729


AVAST Software (ASIA) Limited
Hong Kong


AVAST Software (ASIA) Limited
Beijing, P.R.China

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.