Does anyone know if Avira (the anitvirus program) is safe?

Yes, it's safe. You don't need antivirus software for your mac, but if you elect to run AV software I recommend ClamXav

Yes avira is safe. I would recommend against installing any anti virus software.

Especially don't install mackeeper:

https://discussions.apple.com/docs/DOC-3036

Avira is a legit Mac anti-virus program, with fairly decent malware recognition rates. It's not the best there is, but not far from it, in terms of detection. As for how it affects your system (in terms of stability and performance), I have no personal experience with it... or even second-hand information, for that matter.

I would advise reading my Mac Malware Guide. If, after reading that, you want to install anti-virus software, I would use one of the programs it recommends.

Confused Macbooker wrote:

I was looking for an antivirus online (for free)

Why?

What OS X are you using?