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+# Features Documentation
+
+## Current Features
+
+### 1. YouTube Video Information Retrieval
+- Fetch video metadata without downloading
+- Display video title, thumbnail, and duration
+- View available formats
+
+**Implementation**: `app/api/info` endpoint
+
+### 2. Video Download
+- Download videos in multiple formats:
+  - MP4 (most compatible)
+  - WebM (web-optimized)
+  - MKV (high quality)
+  - AVI (legacy support)
+
+**Implementation**: `app/api/download` endpoint with `formatType: "video"`
+
+### 3. Audio Extraction
+- Extract audio from videos in multiple formats:
+  - MP3 (most compatible, compressed)
+  - WAV (uncompressed, high quality)
+  - M4A (Apple format)
+  - Opus (modern, efficient)
+
+**Implementation**: `app/api/download` endpoint with `formatType: "audio"`
+
+### 4. Format Transcoding
+- Automatic format conversion using yt-dlp and ffmpeg
+- Best quality selection for requested format
+- Audio extraction and conversion for audio formats
+
+**Implementation**: Server-side processing in `lib/youtube.ts`
+
+### 5. Modern UI
+- Responsive design with Tailwind CSS
+- shadcn/ui components for consistent styling
+- Loading states and error handling
+- Video thumbnail preview
+- Format selection dropdowns
+
+**Implementation**: `app/page.tsx` with shadcn/ui components
+
+### 6. URL Validation
+- Client-side and server-side URL validation
+- Support for various YouTube URL formats:
+  - `https://www.youtube.com/watch?v=...`
+  - `https://youtu.be/...`
+  - `youtube.com/watch?v=...`
+
+**Implementation**: `lib/utils.ts` - `isValidYouTubeUrl()`
+
+### 7. Safe File Handling
+- Filename sanitization to prevent directory traversal
+- Unique file IDs to prevent conflicts
+- Proper file extension handling
+
+**Implementation**: `lib/youtube.ts` - `sanitizeFilename()`
+
+## Feature Roadmap
+
+### Planned Features
+
+#### Short Term
+- [ ] Download progress tracking
+- [ ] File size display before download
+- [ ] Video quality selection (720p, 1080p, etc.)
+- [ ] Download history
+- [ ] Error recovery and retry mechanism
+
+#### Medium Term
+- [ ] Playlist support
+- [ ] Batch downloads
+- [ ] Custom ffmpeg parameters
+- [ ] Download queue management
+- [ ] File cleanup automation
+
+#### Long Term
+- [ ] User authentication
+- [ ] Download quotas and limits
+- [ ] Cloud storage integration (S3, etc.)
+- [ ] API rate limiting
+- [ ] Webhook notifications
+- [ ] Mobile app support
+
+## Feature Usage Examples
+
+### Download MP4 Video
+```typescript
+const response = await fetch('/api/download', {
+  method: 'POST',
+  headers: { 'Content-Type': 'application/json' },
+  body: JSON.stringify({
+    url: 'https://www.youtube.com/watch?v=...',
+    format: 'mp4',
+    formatType: 'video'
+  })
+});
+```
+
+### Extract MP3 Audio
+```typescript
+const response = await fetch('/api/download', {
+  method: 'POST',
+  headers: { 'Content-Type': 'application/json' },
+  body: JSON.stringify({
+    url: 'https://www.youtube.com/watch?v=...',
+    format: 'mp3',
+    formatType: 'audio'
+  })
+});
+```
+
+### Get Video Info
+```typescript
+const response = await fetch('/api/info', {
+  method: 'POST',
+  headers: { 'Content-Type': 'application/json' },
+  body: JSON.stringify({
+    url: 'https://www.youtube.com/watch?v=...'
+  })
+});
+```
+
+## Feature Limitations
+
+### Current Limitations
+1. **No Progress Tracking**: Users cannot see download progress
+2. **No File Size Limits**: Large files may cause issues
+3. **No Cleanup**: Files accumulate in storage
+4. **Single Format**: One format per download request
+5. **No Playlist Support**: Only single videos
+6. **No Quality Selection**: Downloads best available quality
+7. **No Authentication**: No user accounts or history
+
+### Known Issues
+- Large files may timeout on slow connections
+- Some videos may not be available in requested format
+- Audio conversion (MP3/WAV) requires ffmpeg
+- No validation of available formats before download
+
+## Feature Dependencies
+
+### Required System Tools
+- **yt-dlp**: For video downloading and format selection
+- **ffmpeg**: For audio format conversion (MP3, WAV)
+
+### Required npm Packages
+- Next.js 16+
+- React 19+
+- shadcn/ui components
+- Tailwind CSS
+- Lucide React (icons)
+
+## Feature Testing
+
+### Manual Testing Checklist
+- [ ] Enter valid YouTube URL and get info
+- [ ] Download video in MP4 format
+- [ ] Download video in WebM format
+- [ ] Extract audio as MP3
+- [ ] Extract audio as WAV
+- [ ] Test with invalid URL (should show error)
+- [ ] Test with missing format (should show error)
+- [ ] Verify file downloads correctly
+- [ ] Check filename sanitization
+
+### Automated Testing (Future)
+- Unit tests for utility functions
+- Integration tests for API endpoints
+- E2E tests for user flows
+- Format validation tests