Visiting Prague may or may not need a Czech Republic visa depending on some restrictions and privileges.
The Czech Republic being a EU member state established an open-border policy with neighboring EU countries. Having a valid visa also means having a passport valid for at least six months or ID card for EU members.
Schengen zone: a hassle-free journey
You can forget about those border posts which divided Czech Republic from neighboring countries because EU and EEC citizens do not need a visa for any purpose of visit. Thanks to Czech Republic now being part of the Schengen zone.
This zone provides that Czech Republic remove passport checks at its land borders and at international airports. Passport checks are required though for people arriving from or travelling to countries outside the zone.
To employ a smooth division of passengers from Schengen states and from other countries, building work has been done Prague-Ruzyně, Brno-Tuřany, Ostrava-Mošnov, Pardubice and Carlsbad international airports.
All citizens of EU Schengen Member States are not required to apply for tourist visa when travelling to Czech Republic. But they are only allowed to stay in the country for not more than 90 days.
As for citizens or other states, they might be asked to apply for a visa at their nearest Czech embassy or consulate for a Schengen Visa. Ukrainians, Moroccans, Singaporeans, and Brazilians must show a valid visa to enter the Czech Republic.
Processing the application takes almost a month so it’s best that you apply in advance. Entry will definitely be refused if you have no visa to show upon arrival in Czech Republic.
Visa extension is requested at Cizinecka Policie a pasove sluzby and you may be granted an additional 90 days to stay in the country. The only considerations would include a few days of application process and extra fee to be paid for the request. Another requirement for entry to the Czech Republic (although required not so frequently) is a return or onward ticket.