[campo21]

The title explains itself. Downloading some apk's online how do I know they don't have some malware or keylogger etc or something else.

[TeamEAService]

Just use javadecompilers[dot]com/apk to decompile a apk or/and virustotal

[mothered]

Unless you disassemble the file, simply use online virus scanners and traditional antivirus & anti-malware software.

[Drako]

Just upload the file to VirusTotal. It will still give you effective scan results. There may be a few antivirus' that can't scan APKs, but most can.

[lilacula]

cant you just use virus total

[lonton]

I don't think your phone can be infected with viruses, but using some ad apps like Lucky Patcher can help you avoid annoying ads gamedva.com/lucky-patcher

[PhantomIN]

There one app called safe app u can give it a try!!!

[Oni]

Mobile security hasn't reached the same level of sophistication as desktops, but I recommend Malwarebytes:
https://play.google.com/store/apps/detai...ntimalware

[mothered]

This thread Is over 18 months old, so I'd say It's safe to assume the OP's concern has been fulfilled.