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AI Video Generator Muhinduzi w'amashusho AI Video Enhancer Videwo... AI Performance Capture (Runway Act-Two) Ihinduramvugo y'amashusho Pikaffects-style Videwo... Birenzeho →

Inyandikonyakwirema

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Urugero:
+ GPT-5, Claude, Gemini
Burn viral TikTok-style captions into your video - big bold text with word-by-word highlight animation (ASS karaoke timing). Prefer plain SRT/VTT sidecar files? Use the Inyandikonyakwirema instead - this one is style-first and always burns in.

Drag a video here or click to upload

, Hejuru Kuri - Biturutse

- - - -
Word-by-word highlight color (karaoke effect).
kugirango Igice
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Upload a video to see the exact cost for your clip.
Download captioned video Iyimura

Umutwempangano

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Short-form completion rate jumps 30-40% with word-by-word captions. The TikTok Neon preset is the one the top creators all use.

Amashusho

MrBeast-style bold-text overlays on reaction / commentary footage. YouTube Lowerthird preset with a translucent box.

kugirango

Itangira OYA - ya: /. Gushyiraho hejuru i - Umutwe Ikadiri.

4 - Intera Kuri

  1. Upload your video. We pull audio, run Whisper STT, and read timing for every spoken segment.
  2. A Imisusire - ni i Umutekano Virusi Ihitamo. / garagaza cyane Ibara: / Ibirindiro i Mburabuzi.
  3. We build an ASS subtitle file with word-by-word karaoke timing (the effect where words change color as they're spoken).
  4. i i Videwo.... - Amasogonda - Funga i tab; Twebwe Imeli Ryari: ni Byakozwe.

,

CapCut's auto-captions are free and good, but you need the CapCut editor installed and you can't batch them. Submagic is $20/mo for unlimited. Opus Clip is $30/mo for long-form → short-form with auto-captions bundled. Captions.AI (App Store) is $10/mo. This tool runs Whisper large-v3 + an ffmpeg ASS karaoke burn-in - the same two primitives all the paid tools use - inside your token pool. For one-offs and batch social exports, it's the fastest path.

Captions vs subtitles - what's the difference?

Subtitles (see /video/subtitle/) are a utility: SRT/VTT sidecar files the viewer's player can toggle on/off, designed for accessibility and upload to YouTube Studio. Captions (this tool) are a style: big bold text burned into every frame with karaoke animation, designed to earn completion rate on TikTok / Reels / Shorts where 85% of viewers keep sound off. Use subtitle for YouTube CCs; use caption for viral short-form.

Kuri Umutwe

  • Videos that already have burned-in captions - the text will double up and look broken.
  • Long-form YouTube uploads - use the sidecar SRT from /video/subtitle/ instead so viewers can toggle CCs.
  • Na: Zeru Ikiganiro - Ntacyo Kuri Umwandiko. - Igice & Ongera Umwandiko Na: Bikora
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Burn viral TikTok-style captions into any video - word-by-word karaoke highlight, 7 style presets, 8 fonts, 99-language Whisper STT. Always burn-in.

Gukoresha Inyandikonyakwirema

1
Iyinjiza

Umwandiko, Kohereza A Idosiye, Cyangwa. Aderesi:.

2
Kurema

Our AI processes your request in seconds using the best open-source models.

3
Iyimura na Gusangiza

, Gukoporora, Cyangwa Gusangiza Igisubizo. ya: Bwite na Koresha.

iyi Biturutse

iyi Kuva: Inyandikoporogaramu. - Impera Akadomo Akadomo, -, Oya Birenzeho. Guhuza i Urubuga Imigaragarire.

Inyandiko Urufunguzo 
curl -X POST https://api.free.ai/v1/video/generate/ \
  -H "Authorization: Bearer sk-free-..." \
  -H "Content-Type: application/json" \
  -d '{"prompt": "A cat playing piano", "duration": 4}'

Amakoresha

AI Video Generator
Muhinduzi w'amashusho
AI Video Enhancer
Videwo...
AI Performance Capture (Runway Act-Two)
Ihinduramvugo y'amashusho
Pikaffects-style
Videwo...

Inyandikonyakwirema - FAQ

Burns viral-style captions into any video with word-by-word karaoke-timing animation. Different from /video/subtitle/: subtitle outputs SRT/VTT sidecar files that players toggle on/off. Caption is always burn-in, style-first, and tuned for TikTok / Reels / Shorts where captions must be hardcoded into every frame.

Four steps: (1) extract mono 16kHz audio from your video, (2) transcribe with Whisper large-v3 for 99-language word timing, (3) build an ASS subtitle file with word-level \kf karaoke timing tags, (4) ffmpeg burns the ASS into every frame using libass for clean anti-aliased text.

50 tokens per second (2,000-token minimum). A 30-second clip is ~2,000 tokens (the floor kicks in); a 60-second clip is ~3,000; a 3-minute clip is ~9,000. STT drives most of the cost; the burn-in adds about 25% on top.

: (Umukara, ijambo - ku - ijambo garagaza cyane), (Umukara in A Agasanduku), (Umukara Na: A umukara), (in A Agasanduku), (Ku i Hejuru:), (Ku i Hasi:), na (Ibumoso: -).

Yes. The Font dropdown overrides the preset with Impact, Montserrat, Bebas Neue, Arial Black, Oswald, Poppins, Anton, or Roboto. The Highlight Color picker controls the word-by-word highlight (any hex). Position lets you override top / center / bottom regardless of preset.

Yes - 99 languages via Whisper. Auto-detect works on 99% of clips. You can force a language if Whisper mis-detects (common on short clips under 5 seconds or mixed-language audio).

No. If there is no spoken dialogue, Whisper returns no segments and we surface a clear "No speech detected" error so you do not burn tokens on an impossible job.

CapCut is free, works offline after install, and has great auto-captions - if CapCut is already your editor, use it there. Inyandikonyakwirema skips the install and gives you batch-friendly browser access. The underlying Whisper + libass chain is the same primitive.

Submagic is $20/mo for unlimited captioning with dozens of style packs. Opus Clip is $30/mo with viral long-form-to-short AI clipping bundled. Captions.AI is $10/mo on mobile. All three use Whisper underneath; their real value is the style library and clip-detection. For one-offs and smaller volumes Inyandikonyakwirema is free inside your token pool.

Whisper gives segment-level timestamps - we evenly distribute the segment duration across its words to derive per-word timing. On fast-spoken segments the estimate can drift by ~0.1 seconds. For frame-accurate timing, use the downloadable .ass file and edit in Aegisub.

. Kohereza, i na i Idosiye - Kwandika i in NIBA Pigiseli - ijambo, Hanyuma Gusubiramo - Na: - = Idosiye.

Yes. POST multipart to /v1/video/caption/ with `file`, `style` (tiktok-neon / youtube-lower / meme / podcast / keynote / cinematic / ted), optional `font`, `highlight_color` (hex), `position`, `language`. Pre-flight: GET /v1/video/caption-quote/?duration=SECS. Snippets at /api/.

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