FreeSubtitles.AI is a free online subtitle generation service that can transcribe any content in any language into any other language, aiming to eliminate language barriers. Free users can upload files up to 300MB and a maximum duration of 30 minutes, while paid users can upload files up to 10GB and a maximum duration of 10 hours. This tool supports audio and video transcription in 111 languages and offers subtitles in various formats. Additionally, paid users can utilize an automatic media downloader and permanently store media files, ensuring user privacy and security.