Supportive interactions on social media have great potential to benefit adolescents’ development. However, there is no instrument to measure online social support (OSS) in China. The study aimed to develop and validate a Chinese short version of the Online Social Support Scale (OSSS). The original scale was translated into Chinese through multiple forward and backward translation protocols. The calibration sample (N = 262) was used to select items and test the reliability, validity, and internal structure of the short form. The cross-validation sample (N = 267) was then used to assess measurement invariance by multigroup confirmatory factor analysis and examine criterion validity based on its relationships with life satisfaction, depression, and time on social media. The 20-item Chinese short version of OSSS (OSSS-CS) includes four factors: esteem/emotional support, social companionship, informational support, and instrumental support. Our results suggest that the OSSS-CS has high internal consistency, construct validity, and criterion validity. Furthermore, evidence of partial cross-validity demonstrated invariance of the variance–covariance matrices, factor structure, factor loadings, and factor variance across independent samples. The results also revealed that the original OSSS could be replicated across cultures. Finally, the short form developed in the study can be used as a reliable and valid measure of online social support among the Chinese adolescent population.

Online disinhibition significantly influences adolescents' communication and behaviors in digital environments, yet culturally adapted measurement tools remain limited in China. This study aimed to develop and validate a Chinese version of the Online Disinhibition Scale (ODS‐C) based on Suler's (2004) theoretical framework. We translated and adapted Cheung et al.'s (2020) questionnaire through rigorous forward and backward translation protocols. Using a calibration sample ( n = 686), we tested the scale's internal structure, reliability, and construct validity. A cross‐validation sample ( n = 687) was subsequently employed to verify and select the optimal internal structure of the ODS‐C, assess measurement invariance across gender, and examine criterion validity based on relationships with internet addiction and cyberbullying perpetration. The final ODS‐C demonstrated a hierarchical five‐factor structure, in which dissociative anonymity and invisibility functioned as two distinct first‐order factors subsumed under a higher‐order anonymity factor, while the remaining four dimensions—asynchronicity, solipsistic introjection, dissociative imagination, and minimization of authority—operated as independent first‐order factors. Results indicate that the ODS‐C demonstrates high internal consistency, robust construct validity, and significant criterion validity. Evidence of measurement invariance confirmed the stability of the factor structure, loadings, and variances across genders. The ODS‐C provides researchers and practitioners with a reliable and valid tool for assessing online disinhibition among Chinese adolescents, facilitating more culturally informed interventions and policies addressing digital behavior.