SoCaptions is a web-based tool that helps creators caption short-form video and export a finished MP4 without a complex editor. Upload an MP4, MOV or WebM clip and AI transcription produces word-level timing, so each caption can follow the spoken words. The process is simple: upload a clip, review the transcript, choose a visual style, then download the rendered video.

Creators can select presets such as Bold Outline, Box BG, Emphasis, Karaoke or Cinematic, and customize fonts, size, position and animation. A timeline lets users correct individual words and adjust captions before export. The result is a burned-in MP4 built for TikTok, Instagram Reels, YouTube Shorts, YouTube and LinkedIn. Captions remain visible when the video is played without sound.

SoCaptions also includes free browser-based subtitle tools. These include SRT, VTT and ASS converters, a timing shifter, frame-rate converter, CPS reading-speed checker, YouTube transcript extractor, Shorts length checker, safe-zone preview and SRT duration tools. A public REST API lets scripts and AI agents caption videos with a single call.

It is designed for content creators, social media managers, educators, marketers and teams who publish clips regularly. New users can try five minutes without a credit card. Pro costs $3 per month for 100 minutes. The product runs in the browser and exports a video file ready to upload.