Objectives. The current study is focused on reporting psychometric properties of the BFI-2 short and extra-short forms in Slovakia. Sample and settings. Data were collected from a Slovak general adult sample (N = 801, 51.2% females) using an online research panel. Statistical analysis. Analysis focused on exploring the factor structure, gender differences, correlations with age and predictions of well-being criteria of the short forms and comparing these forms to the full BFI-2 item set. Results. Random intercept exploratory factor analysis showed that most items loaded on their intended factor in the short form; in the extra-short form a few cases of weak loadings or cross-loadings occurred. Part-whole correlations with the full form were strong. Compared to the full form, the short forms also showed a similar pattern of gender differences and correlations with age, suggesting quite strong congruence of these forms. Focusing on the prediction of selected well-being criteria, the short forms retained 88-94% of explained variance compared to the full form. In sum, these results suggest that short forms of the Slovak BFI-2 are appropriate when a short measure of the Big Five personality factors is needed but should be used with caution and whenever possible, full form should be used. Limitations. Limitations of the current study lie mainly in embedded administration of BFI- 2 shorter versions within full BFI-2, absenting investigation of test-retest stability and selfpeer congruence of results obtained by the short forms of BFI-2.