SoCaptions

SoCaptions is a web app for adding captions to short-form video. Upload a clip and Whisper-based transcription creates word-level timing, so captions highlight in sync with speech. Choose a viral-style preset such as karaoke, bold outline, box, cinematic or minimal. Adjust font, size, position and animation, then edit any word or timing on a timeline. Export a burned-in MP4 ready for TikTok, Instagram Reels, YouTube Shorts or LinkedIn, with no watermark on Pro. The app also includes free browser-only subtitle tools: SRT, VTT and ASS converters, a timing shifter, frame-rate converter, reading-speed CPS checker and YouTube transcript extractor. Developers and AI agents can use the public REST API to caption a video with one call. Five minutes of transcription are free without a card; Pro is $3 per month for 100 minutes and unlimited MP4 exports. API documentation: https://socaptions.com/docs/api This makes it useful for creators who want quick captions without a complicated editing workflow, and for developers who need captions in automated pipelines. Caption styles can be customized to suit each platform and brand. Supported input formats include common video files such as MP4, MOV and WebM. The free utilities run in the browser and help with subtitle-file cleanup even when a user does not need AI video transcription. SoCaptions combines a straightforward web editor with an API, making it suitable for both manual creator workflows and repeatable software integrations.SoCaptions is a web app for adding captions to short-form video. Upload a clip and Whisper-based transcription creates word-level timing, so captions highlight in sync with speech. Choose a viral-style preset such as karaoke, bold outline, box, cinematic or minimal. Adjust font, size, position and animation, then edit any word or timing on a timeline. Export a burned-in MP4 ready for TikTok, Instagram Reels, YouTube Shorts or LinkedIn, with no watermark on Pro. The app also includes free browser-only subtitle tools: SRT, VTT and ASS converters, a timing shifter, frame-rate converter, reading-speed CPS checker and YouTube transcript extractor. Developers and AI agents can use the public REST API to caption a video with one call. Five minutes of transcription are free without a card; Pro is $3 per month for 100 minutes and unlimited MP4 exports. API documentation: https://socaptions.com/docs/api This makes it useful for creators who want quick captions without a complicated editing workflow, and for developers who need captions in automated pipelines. Caption styles can be customized to suit each platform and brand. Supported input formats include common video files such as MP4, MOV and WebM. The free utilities run in the browser and help with subtitle-file cleanup even when a user does not need AI video transcription. SoCaptions combines a straightforward web editor with an API, making it suitable for both manual creator workflows and repeatable software integrations.