I am a Slovak citizen. Am I eligible for free transit visa if I change flights in China?

Obchody, you will easily determine if you can travel through China using one of visa free transit schemes.

So, if your plan to use an itinerary that has more than one stop in China, you can rely on 24 hour visa free transit. This implies that the entire transit time in China cannot be longer than 24 hours, strictly! In other words, these 24 hours are counted from your first scheduled arrival until your last scheduled departure from China. So, if this multi-segment itinerary is shorter than 24 hours, you can use it visa free based on 24 hour visa free transit.

If your travel plan has just one stop in China, you can use even 144 hour visa free transit and enjoy this stop for several days visa free within a territory allowed for your moving. If you use just one stop and your entire transit time is shorter than 24 hours, then this transit is not covered by 144, but by 24 hours visa free transit. So, 144 hour visa free transit applies only if you have one stop and a transit time longer than 24 hours.

All that you need is to print out your flight tickets and your hotel booking confirmation if you intend to have an overnight in China. Basically this is it when the formalities are concerned and I just hope that I have clearly explained the difference when you plan to have more stops within China and when you plan to have just one...