AI caption generator

An AI caption generator is an AI-powered tool that uses speech recognition to convert spoken audio into timed, on-screen text. You upload a video, the AI transcribes each word and applies timestamps and punctuation, and you get auto-generated captions to edit, style, and export as subtitle files or a finished video.

Accuracy sits above 95% on clear audio and stays strong with accents, background noise, and technical vocabulary. Videos under 30 seconds are captioned in moments, low-confidence phrases are flagged for review, and you can fix any word in the transcript editor before export, which cuts cleanup from hours to minutes.

Upload the clip, auto-generate captions, and pick a vertical platform preset. Export the MP4 with captions burned in so the text displays on every device, no separate subtitle file needed. A short clip goes from upload to captioned export in a few minutes, ready to post directly.

Tools like Kapwing and Canva focus on the captioning step. HeyGen builds captioning into a complete AI video generator, so you can script, produce, caption, translate and publish from one video creation workflow instead of moving files between separate apps.

SRT and VTT files upload directly to YouTube, LinkedIn, and most learning platforms as toggleable captions. TXT transcripts work for show notes or as source text for a description generator. For TikTok, Instagram, and Reels, export an MP4 with captions burned in, as those feeds ignore separate subtitle files.

Subtitles display spoken dialogue, while closed captions also include speaker labels and audio context, and viewers can toggle them on or off. HeyGen produces both: export toggleable SRT or VTT caption tracks for players that support them, or burn captions directly into the video file.

Yes. Generate captions in the source language, then translate them into 175+ languages and dialects in one click. Timing carries over automatically, so localised captions stay synced to the original speech without manual re-timing or a second pass through the transcript.

Yes. Würth Group used HeyGen to deliver a 65-minute presentation in 8 languages in 4 days and cut translation costs by 80%. The Würth Group story shows how captioning long videos plus translation scales without extra production staff.

Yes. A large share of social video plays on mute, and viewers are far more likely to finish a captioned clip than an uncaptioned one. Adding captions to your videos also makes spoken content readable as text, which helps uploads surface in search on YouTube, Google and social platforms.

Yes. A free account works as a free tool for shorter clips, so you can try captioning without a subscription. Paid plans start at $24 per month and remove the watermark from every export while unlocking longer uploads, more translation languages, and brand kits for caption styling.