What is AI Captions?

AI captions are automatically generated text overlays synced to video audio using speech recognition. Learn how AI captioning works and why it matters.

  • Captions & Subtitles
  • 4 related terms
Start a 7-day trialBrowse the glossary

Definition

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.

Create ai captions content with BlitzReels

BlitzReels provides the tools and automation to put these concepts into practice.

Start a 7-day trial

All terms

Browse the glossary

Create

Create your next short-form video now.

Start with one raw clip or a long-form recording. BlitzReels gives you the captions, clipping, cleanup, and export tools in one place.

Create my first short
7-day trial includedFull workflow testSingle clips and clipping

New short-form project

Drop video or paste a URL

Upload source video

Clip, caption, reframe, clean up, export

ClipReframeCaptionExport