It is your stay during the validity of your residence title, which entitles you to enter and stay in Poland. To list of residence titles belong for example visa, temporary residence permit, permanent residence permit, residence permit for a long-term resident of the EU. Moreover, foreigners who are exempt from the visa requirement are allowed to enter and stay in Poland as part of visa-free travel. The criteria for entry and stay in Poland as well as the list of visa-free states you will find on the website of the Ministry of Foreign Affairs.
Furthermore if you apply for legalisation of stay in Poland during the validity of any of the mentioned above residence titles, and your application form is free from formal errors, your stay in Poland will be legal until the final decision is issued. The condition of your legal stay, regardless of your residence title, is having a valid travel document (passport).
