SubExtractor

Real-time AI transcription and subtitle extraction for video content

SubExtractor is a powerful yet beautifully simple Chrome extension that helps you extract subtitles, view site captions, generate live transcriptions, clean and organize text, and export everything with ease. Whether you watch videos for learning, research, note-taking, accessibility, or personal study, SubExtractor gives you full control over captions and spoken content from across the web — all processed directly on your device. This extension was created for users who want a reliable, privacy-first tool that works on multiple websites, offers a clean and intuitive interface, and requires no complicated setup. SubExtractor detects captions from major platforms, supports many types of subtitle formats, and includes its own on-device transcription system for videos without subtitles. If you spend time watching videos and wish you could easily save, search, clean, or export what was said, SubExtractor will completely transform how you work with online content. ⸻ What SubExtractor Does 1. Extracts captions from supported sites instantly Many websites provide captions but hide them behind menus or make them difficult to copy. SubExtractor automatically detects subtitles from supported platforms and displays them in a clear, organized panel. Current supported platforms include: • YouTube (UI captions) • TED • Dailymotion • JW.org (.vtt subtitle files) • Sites using standard caption formats such as VTT or SRT • Want support for a specific site? Contact us. Once detected, captions appear automatically in the “Site Captions” tab. Each caption segment displays a timestamp, and all text is fully searchable, scrollable, and editable. This feature is ideal for anyone who needs quick access to captions for studying, translation, note-taking, or accessibility. ⸻ 2. Live Transcription — convert spoken audio into text, even when a video has no subtitles If a video does not include captions or you prefer real-time transcription, SubExtractor includes its own built-in transcription engine powered by Whisper running locally through Transformers.js. You simply click “Start Capture,” and SubExtractor begins converting the audio from your current tab into text. SubExtractor transcribes audio in real time and displays text as it’s generated. You can continue browsing or watching the video normally while SubExtractor listens and converts spoken words into accurate transcripts. ⸻ 3. Everything runs on your device — no recordings or subtitles ever leave your browser Privacy is a core part of SubExtractor. Unlike tools that send audio or subtitles to external servers, all processing happens directly inside your browser through on-device models. Your content stays on your computer, making the tool safe for personal, educational, or confidential material. ⸻ 4. Clean and polish subtitles or transcripts with one click Raw captions and transcripts usually include extra line breaks, odd punctuation, filler words, or fragmented phrases. SubExtractor includes a “Clean Up” system that transforms messy captions into smooth, readable paragraphs. Instead of scrolling through dozens or hundreds of short subtitle lines, you get a clean document that reads normally. ⸻ 5. Edit, combine, search, and organize caption text Everything is designed to be simple, intuitive, and fast. ⸻ 6. Export your captions or transcripts After extracting or generating text, you can export it for later use. SubExtractor supports exporting your cleaned or raw text as .txt files or copying everything to your clipboard in one click. The export tools allow you to take valuable information from online videos and use it wherever you need it. ⸻ 7. Modern, clean, and accessible design SubExtractor’s layout is intentionally simple and elegant. The panel expands as needed, offers a two-tab structure (Live Transcription and Site Captions), and includes a settings area with theme options. The interface is easy for beginners, comfortable for daily use, and visually polished for professionals. ⸻ Why Users Install SubExtractor 1. It's free 2. It provides high-quality transcription even when no subtitles exist 3. It helps you save time. Capturing captions manually is slow and frustrating. SubExtractor organizes and formats everything instantly. 4. It improves learning and note-taking 5. It is excellent for accessibility 6. It respects your privacy 7. It keeps text structured and exportable ⸻ Ideal Use Cases SubExtractor is designed for a wide range of users, including: • Students: Capture lectures, online classes, language lessons, documentaries, and study materials. • Researchers: Extract data and quotes from educational videos or interviews. • JW.org Viewers: Save captions from JW Broadcasting or transcribe older videos without subtitles. • TED Fans: Export captions, transcripts, or clean versions of inspiring talks. • Professionals: Capture meeting notes, training material, or spoken instructions from videos. • Content Creators: Save ideas, quotes, and references from videos for later use. • Language Learners: Extract subtitles to study vocabulary and grammar. • Individuals with hearing impairments: Read what is being said across many sites. • Anyone taking notes from videos: SubExtractor makes this effortless. ⸻ Frequently Asked Questions 1. Does this extension record or upload audio anywhere? No. All transcription is done on your device. 2. Does SubExtractor monitor all pages? No. The extension activates only when you open it. 3. Does it work on every website? Live Transcription works on any page with audio. Site Captions works on supported platforms or sites using standard caption formats. 4. Do I need an account? No.