SubDown – YouTube Transcript, Subtitle Downloader, Translate & AI

About

SubDown — Read, translate, and study YouTube transcripts. Download subtitles or turn them into AI prompts.

🎯 TRANSCRIPTS & SUBTITLES
• Read the full transcript in a side panel while you watch
• Download in SRT, VTT, TXT — or Markdown with clickable timestamp deeplinks
• Markdown export drops straight into Obsidian / Notion — click a timestamp to jump back to the exact second
• Bilingual subtitles — original + translation side by side, 150+ languages (YouTube's built-in translation)
• Copy to clipboard, optional [M:SS] timestamps

📖 READ & NAVIGATE
• Side Panel — browse subtitles while watching; click any line to jump
• Auto-highlight — the current line follows playback in real time
• Search — find any word instantly
• Chapter Digest — read the transcript grouped by video chapter, collapsible
• Video chapters — one-click navigation

🤖 AI PROMPT PACK (no API, no cost)
• One click builds a ready-to-paste prompt from the transcript
• 5 templates: Summarize · Action items · Study notes · Blog draft · Social posts
• Paste into your own ChatGPT / Claude / Gemini — long videos split into parts automatically

🎓 LANGUAGE LEARNING
• Loop a sentence for shadowing / repeat practice
• Slow (or fast) playback — 0.5× up to 3×
• A-B loop — replay any section between two points
• Hide translation, click to reveal — active recall
• Search the transcript with match navigation

🔒 PRIVACY FIRST
• Zero data collection — we never track you
• Runs in your browser — no external servers, no account, no login
• Minimal permissions — only accesses youtube.com

🆓 COMPLETELY FREE
• No limits, no paywall, no ads — every feature is free

💡 WHO IS THIS FOR?
• Language learners — loop, shadow, and read along with real videos
• Note-takers & researchers — timestamped Markdown straight into your knowledge base
• Content creators — transcripts and AI prompts for repurposing
• Anyone who prefers reading to watching

📋 HOW TO USE
1. Go to any YouTube video
2. Click the SubDown icon in the toolbar (or press Alt+S)
3. Read, learn, download, or copy an AI prompt — done!

🌐 LANGUAGES
English and Chinese UI. Subtitles in any language YouTube supports.

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