Panda Software on Wednesday offered up an online spyware scanner with no strings attached. But the tool only detects spyware; it doesn't delete the malicious software.

The for-free SpyXposer will be updated daily, said the Spanish anti-virus vendor, which has U.S. offices in Glendale, Calif.

"PandaLabs is fully aware of the importance of [spyware], and therefore, considers the SpyXposer initiative essential," said Luis Corrons, director of PandaLabs, in a statement.

But he was quick to add that the on-demand SpyXposer isn't the best way to defend a PC against spyware and adware. "We advise users to ensure they have permanent anti- malware protection installed on their computers, and that they are completely up-to-date."

Good advice, since SpyXposer only detects spyware and other malicious code; it doesn't delete or quarantine anything. For that functionality, users must pay $15 for Panda's not-free ActiveScan Pro online service.

Similar tools are available from other security firms, including Webroot and Computer Associates.