AnyTool
Your files never leave your device. All processing happens locally in your browser.

How do I add animated word-by-word captions to a video for free?

Open AnyTool's Dynamic Caption Styling tool, drop in a video, and it auto-transcribes the speech with a self-hosted Whisper model and burns animated, word-by-word captions (karaoke highlight, pop and viral presets) into a real MP4 — all in your browser. No upload, no watermark, no sign-up and no length or video-count caps.

  • Auto-transcribe in-browser (self-hosted Whisper) or paste an SRT
  • Animated word-by-word / karaoke active-word captions burned into MP4
  • Viral presets (Hormozi-style, pop, clean) with live preview
  • 100% in your browser — no upload, no watermark, no sign-up

What is

Animated captions

Animated captions reveal words one at a time and highlight the currently spoken word (karaoke style), often with a pop or scale animation. Burning them into a video renders them permanently into the frames, so they play on any platform without a separate subtitle file.

Video Tools

Related terms

word-by-word captionskaraoke subtitlesburn-inWhisper transcriptionlibass

How to Add Animated Captions to a Video

Burn animated word-by-word captions into a video in your browser.

1 minWeb browser
  1. 1

    Add a video

    Drop in a clip — it stays on your device.

  2. 2

    Transcribe & style

    Auto-transcribe (or paste an SRT) and pick an animated caption preset.

  3. 3

    Burn & download

    Render the captions into an MP4 and download — nothing is uploaded.

Result: A captioned MP4 video

Frequently Asked Questions

No — transcription and the caption burn both run in your browser.

The video, the transcript and the speech model all stay on your device, unlike Submagic, CapCut or VEED which upload to the cloud.

No watermark, no sign-up, and no length or video-count caps — it is free.

Submagic, CapCut, OpusClip and VEED watermark or cap their free tiers; AnyTool does not.

No — it auto-transcribes with a self-hosted Whisper model, or you can paste an SRT/VTT for an instant path.

Pasting a transcript skips the model download and shows captions immediately.

Detailed Explanation

Methodology

How Dynamic Caption Styling Works

AnyTool adds animated captions to a video entirely in the browser. It transcribes speech with a self-hosted Whisper model (WebGPU with WASM fallback) to get word-level timestamps — or accepts a pasted SRT/VTT for an instant path — then renders captions per frame on a canvas with word-by-word reveal and an active-word karaoke highlight, scaled with a pop animation. Frames are encoded to H.264 MP4 with WebCodecs (hardware-accelerated), muxing the original AAC audio; a self-hosted libass/ffmpeg path burns clean static styles as a fallback. No server, no CDN.

  • Runs client-side — video, transcript and model stay on device
  • Self-hosted Whisper transcription (or paste an SRT/VTT)
  • Animated word-by-word + karaoke active-word highlight
  • libass/ffmpeg H.264 burn-in (self-hosted single-thread core)
  • Captions burned into a real MP4, audio preserved
  • No watermark, no sign-up, no length or count caps
Privacy & Security

Privacy vs Cloud Caption Tools

Submagic, Captions.ai, CapCut, VEED and OpusClip upload your video to the cloud, watermark free exports and cap minutes, video count or length. AnyTool transcribes and burns captions on the device, so the video never leaves the browser, with no watermark and no caps, and it works offline after the first load.

Animated captions: AnyTool vs typical tools
CapabilityAnyToolTypical tools
Data handlingIn your browserCloud upload
TranscriptionLocal (Whisper)Cloud
Word-by-word animationYesSometimes
Watermark / capNoneCommon
CostFree, no signupFree/limited

AnyTool is a privacy-first client-side caption burner — transcription and encoding run locally and nothing is uploaded.