How to check balance without syncing blockchain?

Is there a way to check my dero wallet balance on the explorer or somewhere with my dero wallet viewkey?

Not that I know of, no.

DERO is based on CryptoNote protocol unlike bitcoin or other public chains in DERO only you can see your net balance in your wallet only.

@derox

For a few other CryptoNote projects there are some online (usually paid) services that will allow you to enter your private view key and it will scan the blockchain for you. There is nothing like this for Dero at this time.

I very strongly advise against using these services as the odds of running into problems now or in the future are quite high. There can be an enormous number of potential issues like a hacked site, phishing, bad javascript, or any number of problems.