Auto subtitle generator: AI captions for any video

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

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

Yes. The free video plan lets you auto generate subtitles and export accurate subtitles on 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 in one click. The output keeps line-level timing intact, so you can drop translated subtitles into the video and download an SRT or 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 burned in directly. SRT covers most platforms, while VTT is the cleanest pick 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 fix wording, drag a line to retime it, or merge two lines for tighter pacing. The most used subtitle templates save as presets.

Yes. The subtitle editor detects voice changes, separates speakers, and tags each line. You can rename speakers, color-code them, or merge lines from the same speaker. This is the cleanest fit for interviews, panels, podcasts, and webinar recordings.

A typical 5 to 10 minute video transcribes in under two minutes. Longer videos scale linearly, with most one-hour podcasts finishing in 5 to 10 minutes. You stay in the editor the whole time and can style captions directly as soon as the first lines appear.

Use the timeline to nudge 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 chunked too tightly. The waveform under each block makes it easy to align the text to the spoken word.

Yes. You control font, size, color, weight, stroke, background, position, and animation. Save subtitle templates so every video matches your brand. Try kinetic captions for short-form social, or clean two-line blocks for training. Animations sync to 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 fast path for re-using existing transcripts on a new edit.

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

HeyGen pairs auto subtitles with AI voice cloning, AI dubbing, and translation across 175+ languages. Other subtitle tools, including Canva, stop at captions. HeyGen ships the full localized 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 cut translation costs by 80% (case study). Captioning paired with translation scales reach without extra production headcount, even on long-form content.