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Free AI Caption Generator
5 free 15-second clips a month. After that, pay only for what you use.
Auto-generate captions for any video using OpenAI Whisper Large v3, then burn them in with one of 15 styles (CapCut, Hormozi, karaoke, word-box and more). Edit caption text and timing before export — no AI mistakes left behind.
How Caption Generator works
- 1
Upload your video
Drop an MP4 up to 10 minutes long. We probe the duration and show you the exact credit cost upfront.
- 2
Auto-transcribe + edit
Whisper Large v3 generates captions in seconds. Edit any line, fix mistakes, tweak timing — full control before render.
- 3
Pick a style + render
Choose from 15 caption styles. Adjust colour, font, size, position. Render and download the burned-in MP4.
Why CinobiLabs
- Whisper Large v3 — top-tier accuracy, not a mini model
- 5 free renders every month for 15-second clips
- 15 caption styles to match your brand
- Edit any line before render — no AI mistakes shipped
Frequently asked questions
How does the free tier work?
You get 5 free 15-second-or-shorter caption renders per calendar month. The counter resets on the 1st of each month. Once you exhaust the quota or upload a longer video, the paid tiers kick in.
What does it cost after the free tier?
Tiered by video length: ≤15s = 5 ⚡, ≤30s = 10 ⚡, ≤1 min = 15 ⚡, ≤3 min = 30 ⚡, ≤10 min = 50 ⚡. The system probes your video duration and picks the matching tier — no guessing.
Which transcription model do you use?
OpenAI Whisper Large v3 via Replicate — the best open-source transcription model available. Far more accurate than the smaller Whisper variants or "mini" alternatives.
Can I edit the captions before rendering?
Yes. After auto-transcription you can fix any mistranscribed word, adjust line timing, or split/merge lines. Re-render with edited captions any number of times — no extra charge for re-renders within the same caption job.
Which caption styles are available?
CapCut, Hormozi (word-by-word highlight), karaoke, word-box, Netflix, outlined, pop, minimal, glow, typewriter, shadow, fire, impact, cinematic, bounce — 15 styles total. Switch styles freely without re-transcribing.
Do you support languages other than English?
Yes — Whisper Large v3 handles 99 languages including Hindi, Spanish, French, Mandarin, Arabic, and more. Pick "Auto-detect" or specify the language for best accuracy.
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