Yes, you can file 2019 using the online version of TurboTax. For 2018 you will need to purchase the desktop version of TurboTax for 2018 to file a return.
Here is a link to TurboTax Free Edition. You have to meet certain parameters to qualify.
If you do not meet the parameters, there will be a charge for additional forms you may need to use to file your return. You can use this link to file your return TurboTax.