APK How to check for viruses? Experienced Android users are faced with the need to install applications from third-party sources. But this can lead to virus infection and data loss. You can use the free MetaDefender Cloud scanner to protect against malicious APK files. This site will scan the file, as well as show its metadata and application rights. To start scanning, you need to attach a file or its hash, and wait for the end of the scan. The maximum file size is 140 MB.