SubMagic

you are searching for an application for adding and editing subtitles in a movie or any video file, stop searching because SubMagic is the software you need, and it’s free. SubMaic is a full featured subtitle editor which lets you convert, synchronize and create subtitles. It supports several file formats, such as, SRT, SSA, SUB, SMI and TXT. SubMagic offers you a great subtitle analyzer which can find errors in their composition. Most frequent errors like too long lines or too short subtitles are shown and corrected automatically, though we recommend checking them manually. In addition it will show you the longest subtitle and the shortest one, as well as the one which is more time on screen. It is a great choice and it is free. As we told you at first, stop searching, you have found the solution.