NovaTools

AI Subtitle Generator & Studio

0 bytes uploaded · Local In-Browser Engine
Overview & Client Processing
In-Browser Whisper Speech Recognition via WebGPU / Local Client Runtime .mp4, .webm, .mov, .mkv, .mp3, .wav, .m4a

The AI Subtitle Generator automatically transcribes spoken dialogue from video and audio files, generating timestamped subtitles and captions. It features an interactive cue studio where creators can fine-tune timestamps, adjust cue boundaries, and export standard .srt or .vtt caption files.

By running lightweight Whisper neural models locally through WebGPU and client-side in-browser runtime, NovaTools keeps sensitive audio recordings, pre-release videos, and corporate interviews entirely private. You get accurate speech recognition with zero cloud API costs, no file size limits, and zero server uploads.

Drop video or audio to generate subtitles, or browse files

Supports MP4, WebM, MKV, MOV, MP3, WAV, M4A, or import existing .SRT / .VTT files.

OpenAI Whisper AI (WebAssembly) · 100+ Languages Supported
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Step-by-Step Execution Guide
1

Upload Video or Audio

Select any MP4, WebM, MOV, MKV, MP3, WAV, or M4A file, or import an existing .SRT/.VTT.

2

Transcribe & Generate

Select audio spoken language and let the in-browser AI generate timed subtitle cues.

3

Edit & Export

Preview with synchronized video playback, adjust cues, and download as .SRT, .VTT, or ZIP.

Security & Processing Specifications
  • 100% In-Memory Sandbox Files are decoded and manipulated inside local RAM. Memory is wiped immediately when closed.
  • 100% Client-Side AI: Whisper speech-to-text with zero server uploads
  • Multi-format export: .SRT, .VTT (WebVTT), .TXT, and .JSON
  • Synchronized video player with live subtitle overlay preview
  • Interactive cue editor with timestamp nudging and search/replace
Practical Use Cases

Social Media Captions

Creating accessible subtitles for TikTok, Instagram Reels, YouTube Shorts, and LinkedIn videos.

Accessibility Compliance

Adding ADA and WCAG-compliant closed captions to educational materials and webinars.

Content Repurposing

Transcribing podcasts and interviews into written blog articles and documentation.

Frequently Asked Questions (FAQ)

Is my media uploaded to any server for transcription?

No! The AI model runs entirely inside your browser using Client-Side Engine and WebGPU. Your media never leaves your device.

What subtitle formats can I export?

You can export SubRip (.srt), WebVTT (.vtt), plain text transcript (.txt), or structured JSON.

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