Captions & Subtitles

What is AI Captions?

AI captions are automatically generated text overlays synchronized to spoken audio in a video, created using speech recognition AI that transcribes audio and places text with word-level timing.

AI Captions Explained

AI captioning uses automatic speech recognition (ASR) to transcribe spoken audio, then generates timed text overlays that appear as each word is spoken. Modern AI caption systems provide word-level timing accuracy, allowing animated caption styles where individual words highlight, bounce, or appear in sequence. This contrasts with traditional SRT subtitles which show full sentences. AI captions have become essential for short-form video because 85% of social media video is watched without sound. Caption styles can include animations, colors, fonts, backgrounds, and effects that match the visual aesthetic of the video. BlitzReels offers 30+ animated caption styles with word-level sync, batch captioning, and platform-optimized export.

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Related Terms

SRT Subtitles

SRT (SubRip Text) is a plain-text subtitle file format that stores timed text with sequence numbers, timestamps, and subtitle content for displaying text over video.

Word-Level Sync

Word-level sync is a captioning precision where each individual word is timed to appear or animate at the exact moment it is spoken in the audio, rather than showing full sentences at once.

Transcription

Transcription is the process of converting spoken audio from a video or audio recording into written text, producing a verbatim or edited text document representing the spoken content.

Caption Styles

Caption styles are visual design presets that control how text captions appear on screen, including font, color, size, position, background, and animation effects.