Auto Subtitles is a web-based application that generates subtitles and captions for videos using artificial intelligence. Its primary function is to transcribe spoken audio into text, align the text to specific timestamps, and produce animated captions that can be burned directly into the video file. The tool operates entirely within a web browser, requiring no software installation or account creation for basic use. The application offers a range of features centered on transcription and caption customization. It supports speech-to-text transcription in over 100 languages and includes a library of 28 preset animated caption styles, such as karaoke word highlights, bold outlines, and minimal clean layouts. Users can edit subtitle text inline, adjust word timing boundaries, split or merge caption segments, and remove silent gaps between spoken lines. Additional capabilities include an AI subtitle translator with support for more than 30 languages, a video timeline editor for multi-track editing, and the ability to export videos in MP4 or WebM format with subtitles burned in. Subtitle files in SRT, VTT, and TXT formats are available on paid plans. Typical use cases include adding captions to short-form content for platforms like TikTok, Instagram Reels, and YouTube Shorts, as well as creating subtitled videos for longer projects such as presentations or educational content. The workflow involves dragging and dropping an MP4, MOV, or WebM file into the browser interface, selecting a caption style from the preset library, and adjusting any text or timing directly in the timeline. The tool then renders the final video locally, bypassing the need for cloud upload queues. Technically, Auto Subtitles runs entirely in the local browser environment, performing video decoding and canvas preview on the user’s device. This approach eliminates the need to upload raw footage to a server. The free tier supports videos up to 10 minutes in length with 720p export quality and includes a watermark. Paid plans (Pro and Max) remove the watermark, allow higher resolution exports up to 4K, extend maximum video duration to 30 or 60 minutes, and enable downloads of subtitle files along with additional features such as font uploads and priority support.