Auto subtitle generator: AI captions for any video

An auto subtitle generator is an AI caption generator that converts speech in a video into text and produces time-coded subtitles. You upload a video, the tool automatically runs speech recognition, and then returns accurate captions that you can edit, translate, or export as an SRT file or burn directly into an MP4.

Accuracy goes above 95% on clear English audio and stays strong even with accents, background noise, and technical terms. You can fine-tune any word by clicking on it, then align the text on the timeline. The system also flags low-confidence phrases for you to review before export.

Yes. The free video plan lets you automatically generate subtitles and export accurate subtitles for shorter videos. Paid plans unlock longer videos, more languages, watermark-free exports, brand kits, and team collaboration on the HeyGen plan page.

Yes. After you generate subtitles for your video, you can translate captions into 175+ languages and dialects with a single click. The output keeps line-level timing intact, so you can add the translated subtitles to the video and download an SRT or an MP4 with burned-in captions.

You can download SRT, VTT, and TXT transcripts for YouTube, social platforms, video editors, or LMS systems. You can also export an MP4 with captions burnt in directly. SRT works for most platforms, while VTT is the cleanest choice for HTML5 video players.

Yes. Every word is editable, every line is movable, and every timing point snaps to the waveform. Click a word to refine the wording, drag a line to adjust the timing, or merge two lines for tighter pacing. The most frequently used subtitle templates are saved as presets.

Yes. The subtitle editor detects voice changes, separates speakers, and tags each line. You can rename speakers, colour-code them, or merge lines from the same speaker. This is the most suitable option for interviews, panel discussions, podcasts, and webinar recordings.

A typical 5 to 10 minute video is transcribed in under two minutes. Longer videos scale in a linear way, with most one-hour podcasts finishing in 5 to 10 minutes. You remain in the editor the entire time and can style captions directly as soon as the first lines appear.

Use the timeline to adjust any line by milliseconds. You can drag the line forward or back, split a line at a cursor point, or merge two lines that were split too tightly. The waveform under each block makes it easy to align the text with the spoken word.

Yes. You control the font, size, colour, weight, stroke, background, position, and animation. Save subtitle templates so every video matches your brand. Try kinetic captions for short-form social content, or clean two-line blocks for training. Animations stay in sync with the spoken word.

Yes. If you already have an SRT or VTT subtitle file, upload it and the editor maps every line to the video’s audio. You can then restyle, retime, or translate your subtitles into almost any language. This is a quick way to re-use existing transcripts in a new edit.

Generate subtitles, choose a 9:16 format, style the captions for short-form content, and export the video as an MP4 with subtitles burned in. The output is ready to upload to TikTok, Reels, or Shorts. You can also download an SRT file and use each platform’s native caption upload option.

HeyGen pairs automatic subtitles with AI voice cloning, AI dubbing, and translation across 175+ languages. Other subtitle tools, including Canva, stop at captions. HeyGen delivers the complete localised video creation workflow from the same project.

Yes. Würth Group used HeyGen to translate a 65-minute presentation into 8 languages in 4 days and reduced translation costs by 80% (case study). Captioning combined with translation helps scale your reach without adding extra production staff, even for long-form content.