We are using Oracle 12C database with below settings - Code (SQL): SELECT * FROM nls_database_parameters WHERE parameter LIKE '%CHARACTERSET'; Result : NLS_NCHAR_CHARACTERSET UTF8 NLS_CHARACTERSET AL32UTF8 Windows client Environment Variable set to - NLS_LANG = AMERICAN_AMERICA.UTF8 Windows Registry for Oracle set to - NLS_LANG = AMERICAN_AMERICA.AL32UTF8 Now we are trying to insert Swedish characters to table via SQLPLUS - Code (SQL): INSERT INTO gen_barium_ucc_src_t (MI_INPUT_ID, "NAME", LOGIN_ID, USER_EMAIL, CC, STATUS, "ROLE", INS_DTIME ) VALUES ('96', 'Susanne Svärd', 'SUSA', 'S@abc', 'CC00007', 'ACTIVE', 'DEV', SYSDATE ); While checking the same with SQL PLUS, it is showing Swedish characters perfectly. But while checking the same with SQL Developer GUI, it is not showing Swedish Characters properly in table . It is showing Swedish characters as "?". Then I tried to insert the same with SQL Developer GUI. Here Table is accepting Swedish characters properly. Is there something I am missing?