AI Caption Generator｜Upload & Caption
Upload one video and get perfectly timed captions. TikTok-style word pop, bold hooks, or clean subtitles — free, no watermark.
Free AI caption generator: upload a video and get timed captions — word-by-word pop, bold hooks, or clean subtitles as MP4 and/or SRT. Free trial, try it now.
Features
- Word-level timing——Timed down to word level, aligned to your voice. Noise and crosstalk are called out honestly instead of guessed over.
- 3 caption styles——TikTok word-pop, bold meme hooks, or calm bottom subtitles. Same video, three totally different finishes.
- Burned-in or SRT——Burned-in MP4 for posting, SRT plus VTT and transcript for editing. Translate into English, Chinese, or Spanish on the way.
How it works
- Upload one vertical video MP4, MOV, or WebM up to 200MB. One talking-head clip, course recording, or ad cut is all it takes — clear speech beats fancy visuals.
- Pick a caption style We transcribe every line with timestamps, then style it: word-by-word pop, bold meme hooks, or clean bottom subtitles. Add tricky name spellings in the notes box.
- Get MP4 plus SRT files Take the burned-in MP4 for TikTok and Reels, the SRT plus VTT and transcript for YouTube and course sites — or both. Wrong word? Tell us the line, we fix it.
FAQ
- Is it free? Do I need to sign up?
- Yes. Upload a video and get captioned results free, no sign-up and no watermark on the finished file. Heavy or very long videos may use credits, but trying it costs nothing.
- I only have one video — is that enough?
- One video is enough. This tool is built around a single upload: a vertical talking-head clip, a course recording, or an ad cut. Clear human speech matters far more than fancy visuals.
- How accurate are the captions?
- On clear human speech, expect around 95% — comparable to mainstream caption tools. Accents, heavy noise, or people talking over each other lower accuracy. Every result is editable: tell us which line to fix and we re-issue it.
- Can I edit the wording afterward?
- Yes. After generating, tell us the sentence and the correction — especially names, brands, and terminology — and we will fix the wording and re-time that line. Tip: put tricky spellings in the notes box before generating to get it right first time.
- Which caption languages work?
- Auto-detect plus English, Chinese, and Spanish. Auto-detect keeps captions in the language spoken in the video; pick a language to transcribe or translate directly into it.
- Can it translate my Chinese video?
- Yes — choose English as the caption language and Chinese lines come back as natural, punchy English ad copy rather than word-for-word translation. Course and lecture content keeps full terminology instead.
- Burned-in video or SRT file?
- Both. Pick burned-in MP4 if you post straight to TikTok, Reels, or Shorts; pick the SRT file if you edit in CapCut or upload to YouTube and course platforms; pick both and you never have to choose.
Try it free