Currently, you can change conversion settings in video and audio conversions.
If your output file is either video or audio you will see a 'gear' icon near the file:
Clicking on this icon will open a conversion settings dialog where you can set up video and audio conversion settings. This should be done prior to the conversion start:
Unfortunately, at this moment you can't set up conversion options for other file conversion directions, but we are working on implementing them as well. Currently, the default settings are set in a way that will satisfy the majority of the users and perform conversion lossless or with an imperceptible loss of quality.
The conversion options for image and document conversions will be available soon, they're in the development stage, but not ready for public testing yet.
Please, accept our apologies for any inconvenience this may cause you!