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 timecodes and punctuation, and you get automatically generated captions that you can edit, style, and export as subtitle files or as a finished video.

Accuracy stays above 95% on clear audio and remains strong even with accents, background noise, and technical vocabulary. Videos under 30 seconds get captioned in moments, low-confidence phrases are flagged for review, and you can correct any word in the transcript editor before export, reducing cleanup from hours to just a few minutes.

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

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

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

Subtitles show only the spoken dialogue, while closed captions also include speaker labels and audio descriptions, and viewers can switch them on or off. HeyGen creates both: export switchable SRT or VTT caption tracks for players that support them, or burn the captions directly into the video file.

Yes. First generate captions in the original language, then translate them into 175+ languages and dialects with a single click. The timing carries over automatically, so the localised captions stay synced to the original lip-synced speech without any manual re-timing or a second pass through the transcript.

Yes. Würth Group used HeyGen to deliver a 65-minute presentation in 8 languages within 4 days and reduce translation costs by 80%. The Würth Group story shows how captioning long videos along with translation can scale without needing additional production staff.

Yes. A large share of social video plays on mute, and viewers are far more likely to finish a captioned clip than one without captions. Adding captions to AI video ads also makes spoken content readable as text, which helps uploads appear 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 also unlocking longer uploads, more translation languages, and brand kits for caption styling.

Yes. Create an audio or video episode from text, a PDF, or a URL with the AI podcast generator and more, then generate and edit timed captions for the video before exporting it as a captioned MP4 or with a separate subtitle file.

Yes. After you turn PowerPoint slides into a video with narration, you can generate timed captions, correct the transcript, and export the result with burned-in text or as a separate SRT or VTT file.

Yes. After creating a narrated faceless video from a script or idea, you can generate timed captions, fine-tune their wording and style, and export either a captioned MP4 for social platforms or a separate subtitle file.

Yes. After you convert a PDF into a video, generate timed captions from its narration, correct any names or technical terms, and export the finished video with burned-in captions or as a separate SRT or VTT file.

Yes. After an AI spokesperson delivers your script, you can generate timed captions from the spoken audio, refine the transcript, and export the video with styled, burned-in captions or as a separate subtitle file.