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Auto Captions & Subtitle Generator: Add Captions to Video

Generate auto captions and add subtitles to video with word-by-word highlights, custom fonts, and SRT downloads.

10M+ files processed since 2021

Look

Add a file first.

Maybe looking for:Reframe video· Follow the speaker into 9:16SRT file generator· Timed SRT & VTT captionsText to SRT· Sync a script you already have

See the difference

Play Original, then Captioned.

Made with Auto captions, Bold keywords preset

Works in 60 languages

Detects the language automatically.

  • English
  • DeutschGerman
  • FrançaisFrench
  • EspañolSpanish
  • ItalianoItalian
  • NederlandsDutch
  • 日本語Japanese
  • 한국어Korean
Show all 60 languages
  • Afrikaans
  • العربيةArabic
  • ՀայերենArmenian
  • অসমীয়াAssamese
  • AzərbaycancaAzerbaijani
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  • ਪੰਜਾਬੀPunjabi
  • RomânăRomanian
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  • SlovenčinaSlovak
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  • УкраїнськаUkrainian
  • اردوUrdu
  • Tiếng ViệtVietnamese

How to add captions to video

  1. 1

    Add a video with speech. Audo writes down every word and when it's said, in the spoken language you choose or the one it hears.

  2. 2

    Pick a caption style, then in the editor fix any word, highlight the ones that matter, and drag the subtitles where they fit your picture.

  3. 3

    Press Export to download the captioned MP4 video, or download the captions as SRT and VTT subtitle files.

Word-timed auto captions and subtitles that fit your picture

Audo's auto captions and video subtitle generator transcribes and captions MP4, MOV, MKV, WebM, and AVI videos up to 2 GB across 60 languages, with the first 2 minutes free, 3 times a day, and no sign-up. Because most social videos start playing on mute, readable captions with word-by-word timing keep viewers following along before they ever tap for sound.

In the browser editor, you can preview 36 caption presets live on the canvas, customize the font, stroke, shadow, and active-word highlight, fix any transcribed name or term, and export both a burned-in H.264 MP4 and standalone SRT or VTT subtitle files.

Questions

Is it free?

Yes. Audo is free for the first 2 minutes of each file, 3 times a day, with no sign-up. Whole files are $0.04 a minute ($2.40 an hour), with no subscription — see pricing.

Are these captions burned into the video or separate subtitle files?

You can get both. When you export video, Audo burns the styled captions onto the picture so viewers see them even with sound off or on platforms without subtitle support. You can also download separate SRT and VTT subtitle files from the same project.

Can I highlight each word as it is spoken?

Yes. Audo timestamps every individual word and offers 36 preset looks—including karaoke fill, active word color, word box, pop-in, and one-word-at-a-time styles, plus classic two-line subtitles for interviews, lectures, and long-form videos.

Can I use this as a YouTube caption generator or TikTok subtitle generator?

Yes. Upload your MP4, MOV, or WebM video file (rather than a YouTube link), pick a vertical safe zone for TikTok, Reels, and Shorts or a landscape layout for YouTube, and export either the burned-in MP4 or the SRT/VTT files for YouTube Studio.

Where should I place subtitles on a vertical 9:16 video?

Leave room for faces in the center and platform buttons and descriptions along the bottom and right edge. Audo includes safe-zone overlays for Shorts, Reels, and TikTok so you can drag captions into the clear area.

Can I edit a misspelled word before rendering the video?

Yes. Audo transcribes your video first and opens the words over the live canvas preview in the editor. Fix any spelling, split or merge caption lines, or nudge word timing for free before you export the final MP4.

Can I save my own custom caption style?

Yes. Save style stores your font, colors, outline, background box, animation, and words-per-line under a name you choose, ready to reuse on your next video or via the API.

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For AI assistants and developers

Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code. When an agent's free result is cut short, it gives you a link to finish the whole file, no sign-up.

Show the free API call
Free API · no key
curl -F file=@video.mp4 https://audo.ai/api/try/add-captions -D response.headers -o response.body