feat: add comprehensive conversion options and enhanced UI

This major update adds powerful format-specific controls, quality presets,
file metadata display, and enhanced progress feedback to significantly
improve the user experience.

New Components:
- ConversionOptionsPanel: Format-specific controls with collapsible advanced options
  - Video options: codec selection (H.264, H.265, VP8, VP9), bitrate, resolution, FPS
  - Audio options: codec selection, bitrate, sample rate, channels
  - Image options: quality slider, width/height controls
- Quality Presets: One-click presets (High Quality, Balanced, Small File, Web Optimized)
- FileInfo: Displays file metadata including size, duration, dimensions
- Slider: Reusable slider component for quality/bitrate controls
- Select: Reusable dropdown component for codec/format selection

Enhanced Features:
- ConversionPreview improvements:
  - Real-time elapsed time display
  - Estimated time remaining calculation
  - File size comparison (input vs output with % reduction/increase)
  - Better visual status indicators with icons
  - Enhanced loading states with detailed progress
- FileConverter integration:
  - Passes conversion options to converter services
  - Manages conversion options state
  - Resets options on file reset

UI/UX Improvements:
- Format-specific option panels that adapt to selected output format
- Visual preset buttons with icons and descriptions
- Collapsible advanced options to reduce clutter
- Better progress feedback with time estimates
- File size comparison badges showing compression results
- Smooth animations and transitions (existing animations already in place)
- Responsive design for all new components

Technical Details:
- Options are properly typed and integrated with ConversionOptions interface
- All components support disabled states during conversion
- Preview component calculates speed and estimates remaining time
- Metadata extraction for video/audio/image files using browser APIs
- Proper cleanup of object URLs and timers

User Benefits:
- Power users can fine-tune codec, bitrate, resolution settings
- Beginners can use quality presets with confidence
- Better understanding of conversion progress and file size impact
- Informed decisions with file metadata display
- Professional-grade control over output quality

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/converter/ConversionOptions.tsx

@@ -0,0 +1,406 @@
+'use client';
+
+import * as React from 'react';
+import { ChevronDown, ChevronUp, Sparkles } from 'lucide-react';
+import { Card } from '@/components/ui/Card';
+import { Button } from '@/components/ui/Button';
+import { Slider } from '@/components/ui/Slider';
+import { Select } from '@/components/ui/Select';
+import type { ConversionOptions, ConversionFormat } from '@/types/conversion';
+
+interface ConversionOptionsProps {
+  inputFormat: ConversionFormat;
+  outputFormat: ConversionFormat;
+  options: ConversionOptions;
+  onOptionsChange: (options: ConversionOptions) => void;
+  disabled?: boolean;
+}
+
+interface QualityPreset {
+  id: string;
+  name: string;
+  description: string;
+  icon: string;
+  options: ConversionOptions;
+}
+
+export function ConversionOptionsPanel({
+  inputFormat,
+  outputFormat,
+  options,
+  onOptionsChange,
+  disabled = false,
+}: ConversionOptionsProps) {
+  const [isExpanded, setIsExpanded] = React.useState(false);
+  const [selectedPreset, setSelectedPreset] = React.useState<string | null>(null);
+
+  // Quality presets based on output format category
+  const getPresets = (): QualityPreset[] => {
+    const category = outputFormat.category;
+
+    if (category === 'video') {
+      return [
+        {
+          id: 'high-quality',
+          name: 'High Quality',
+          description: 'Best quality, larger file size',
+          icon: '⭐',
+          options: {
+            videoBitrate: '5M',
+            videoCodec: outputFormat.extension === 'webm' ? 'libvpx' : 'libx264',
+            audioBitrate: '192k',
+            audioCodec: outputFormat.extension === 'webm' ? 'libvorbis' : 'aac',
+          },
+        },
+        {
+          id: 'balanced',
+          name: 'Balanced',
+          description: 'Good quality, moderate size',
+          icon: '⚖️',
+          options: {
+            videoBitrate: '2M',
+            videoCodec: outputFormat.extension === 'webm' ? 'libvpx' : 'libx264',
+            audioBitrate: '128k',
+            audioCodec: outputFormat.extension === 'webm' ? 'libvorbis' : 'aac',
+          },
+        },
+        {
+          id: 'small-file',
+          name: 'Small File',
+          description: 'Smaller size, lower quality',
+          icon: '📦',
+          options: {
+            videoBitrate: '1M',
+            videoCodec: outputFormat.extension === 'webm' ? 'libvpx' : 'libx264',
+            audioBitrate: '96k',
+            audioCodec: outputFormat.extension === 'webm' ? 'libvorbis' : 'aac',
+          },
+        },
+        {
+          id: 'web-optimized',
+          name: 'Web Optimized',
+          description: 'Fast loading for web',
+          icon: '🌐',
+          options: {
+            videoBitrate: '1.5M',
+            videoCodec: 'libvpx',
+            audioBitrate: '128k',
+            audioCodec: 'libvorbis',
+            videoResolution: '720x-1',
+          },
+        },
+      ];
+    } else if (category === 'audio') {
+      return [
+        {
+          id: 'high-quality',
+          name: 'High Quality',
+          description: 'Best audio quality',
+          icon: '⭐',
+          options: {
+            audioBitrate: '320k',
+            audioCodec: outputFormat.extension === 'mp3' ? 'libmp3lame' : 'default',
+          },
+        },
+        {
+          id: 'balanced',
+          name: 'Balanced',
+          description: 'Good quality, smaller size',
+          icon: '⚖️',
+          options: {
+            audioBitrate: '192k',
+            audioCodec: outputFormat.extension === 'mp3' ? 'libmp3lame' : 'default',
+          },
+        },
+        {
+          id: 'small-file',
+          name: 'Small File',
+          description: 'Minimum file size',
+          icon: '📦',
+          options: {
+            audioBitrate: '128k',
+            audioCodec: outputFormat.extension === 'mp3' ? 'libmp3lame' : 'default',
+          },
+        },
+      ];
+    } else if (category === 'image') {
+      return [
+        {
+          id: 'high-quality',
+          name: 'High Quality',
+          description: 'Best image quality',
+          icon: '⭐',
+          options: {
+            imageQuality: 95,
+          },
+        },
+        {
+          id: 'balanced',
+          name: 'Balanced',
+          description: 'Good quality',
+          icon: '⚖️',
+          options: {
+            imageQuality: 85,
+          },
+        },
+        {
+          id: 'web-optimized',
+          name: 'Web Optimized',
+          description: 'Optimized for web',
+          icon: '🌐',
+          options: {
+            imageQuality: 75,
+          },
+        },
+      ];
+    }
+
+    return [];
+  };
+
+  const presets = getPresets();
+
+  const handlePresetClick = (preset: QualityPreset) => {
+    setSelectedPreset(preset.id);
+    onOptionsChange({ ...options, ...preset.options });
+  };
+
+  const handleOptionChange = (key: string, value: any) => {
+    setSelectedPreset(null); // Clear preset when manual change
+    onOptionsChange({ ...options, [key]: value });
+  };
+
+  const renderVideoOptions = () => (
+    <div className="space-y-4">
+      {/* Video Codec */}
+      <Select
+        label="Video Codec"
+        value={options.videoCodec || 'default'}
+        onValueChange={(value) => handleOptionChange('videoCodec', value === 'default' ? undefined : value)}
+        options={[
+          { value: 'default', label: 'Auto (Recommended)' },
+          { value: 'libx264', label: 'H.264 (MP4, AVI, MOV)' },
+          { value: 'libx265', label: 'H.265 (MP4)' },
+          { value: 'libvpx', label: 'VP8 (WebM)' },
+          { value: 'libvpx-vp9', label: 'VP9 (WebM)' },
+        ]}
+        disabled={disabled}
+      />
+
+      {/* Video Bitrate */}
+      <div>
+        <label className="text-sm font-medium text-foreground mb-2 block">Video Bitrate</label>
+        <div className="space-y-2">
+          <Slider
+            min={0.5}
+            max={10}
+            step={0.5}
+            value={parseFloat(options.videoBitrate?.replace('M', '') || '2')}
+            onValueChange={(value) => handleOptionChange('videoBitrate', `${value}M`)}
+            showValue={true}
+            unit="M"
+            disabled={disabled}
+          />
+          <p className="text-xs text-muted-foreground">Higher bitrate = better quality, larger file</p>
+        </div>
+      </div>
+
+      {/* Resolution */}
+      <Select
+        label="Resolution"
+        value={options.videoResolution || 'original'}
+        onValueChange={(value) => handleOptionChange('videoResolution', value === 'original' ? undefined : value)}
+        options={[
+          { value: 'original', label: 'Original' },
+          { value: '1920x-1', label: '1080p (1920x1080)' },
+          { value: '1280x-1', label: '720p (1280x720)' },
+          { value: '854x-1', label: '480p (854x480)' },
+          { value: '640x-1', label: '360p (640x360)' },
+        ]}
+        disabled={disabled}
+      />
+
+      {/* FPS */}
+      <Select
+        label="Frame Rate (FPS)"
+        value={options.videoFps?.toString() || 'original'}
+        onValueChange={(value) => handleOptionChange('videoFps', value === 'original' ? undefined : parseInt(value))}
+        options={[
+          { value: 'original', label: 'Original' },
+          { value: '60', label: '60 fps' },
+          { value: '30', label: '30 fps' },
+          { value: '24', label: '24 fps' },
+          { value: '15', label: '15 fps' },
+        ]}
+        disabled={disabled}
+      />
+
+      {/* Audio Bitrate */}
+      <Slider
+        label="Audio Bitrate"
+        min={64}
+        max={320}
+        step={32}
+        value={parseInt(options.audioBitrate?.replace('k', '') || '128')}
+        onValueChange={(value) => handleOptionChange('audioBitrate', `${value}k`)}
+        showValue={true}
+        unit="k"
+        disabled={disabled}
+      />
+    </div>
+  );
+
+  const renderAudioOptions = () => (
+    <div className="space-y-4">
+      {/* Audio Codec */}
+      <Select
+        label="Audio Codec"
+        value={options.audioCodec || 'default'}
+        onValueChange={(value) => handleOptionChange('audioCodec', value === 'default' ? undefined : value)}
+        options={[
+          { value: 'default', label: 'Auto (Recommended)' },
+          { value: 'libmp3lame', label: 'MP3 (LAME)' },
+          { value: 'aac', label: 'AAC' },
+          { value: 'libvorbis', label: 'Vorbis (OGG)' },
+          { value: 'libopus', label: 'Opus' },
+          { value: 'flac', label: 'FLAC (Lossless)' },
+        ]}
+        disabled={disabled}
+      />
+
+      {/* Bitrate */}
+      <Slider
+        label="Bitrate"
+        min={64}
+        max={320}
+        step={32}
+        value={parseInt(options.audioBitrate?.replace('k', '') || '192')}
+        onValueChange={(value) => handleOptionChange('audioBitrate', `${value}k`)}
+        showValue={true}
+        unit="k"
+        disabled={disabled}
+      />
+
+      {/* Sample Rate */}
+      <Select
+        label="Sample Rate"
+        value={options.audioSampleRate?.toString() || 'original'}
+        onValueChange={(value) => handleOptionChange('audioSampleRate', value === 'original' ? undefined : parseInt(value))}
+        options={[
+          { value: 'original', label: 'Original' },
+          { value: '48000', label: '48 kHz (Studio)' },
+          { value: '44100', label: '44.1 kHz (CD Quality)' },
+          { value: '22050', label: '22.05 kHz' },
+        ]}
+        disabled={disabled}
+      />
+
+      {/* Channels */}
+      <Select
+        label="Channels"
+        value={options.audioChannels?.toString() || 'original'}
+        onValueChange={(value) => handleOptionChange('audioChannels', value === 'original' ? undefined : parseInt(value))}
+        options={[
+          { value: 'original', label: 'Original' },
+          { value: '2', label: 'Stereo (2 channels)' },
+          { value: '1', label: 'Mono (1 channel)' },
+        ]}
+        disabled={disabled}
+      />
+    </div>
+  );
+
+  const renderImageOptions = () => (
+    <div className="space-y-4">
+      {/* Quality */}
+      <Slider
+        label="Quality"
+        min={1}
+        max={100}
+        step={1}
+        value={options.imageQuality || 85}
+        onValueChange={(value) => handleOptionChange('imageQuality', value)}
+        showValue={true}
+        unit="%"
+        disabled={disabled}
+      />
+
+      {/* Width */}
+      <div>
+        <label className="text-sm font-medium text-foreground mb-2 block">Width (px)</label>
+        <input
+          type="number"
+          value={options.imageWidth || ''}
+          onChange={(e) => handleOptionChange('imageWidth', e.target.value ? parseInt(e.target.value) : undefined)}
+          placeholder="Original"
+          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm"
+          disabled={disabled}
+        />
+        <p className="text-xs text-muted-foreground mt-1">Leave empty to keep original</p>
+      </div>
+
+      {/* Height */}
+      <div>
+        <label className="text-sm font-medium text-foreground mb-2 block">Height (px)</label>
+        <input
+          type="number"
+          value={options.imageHeight || ''}
+          onChange={(e) => handleOptionChange('imageHeight', e.target.value ? parseInt(e.target.value) : undefined)}
+          placeholder="Original"
+          className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm"
+          disabled={disabled}
+        />
+        <p className="text-xs text-muted-foreground mt-1">Leave empty to maintain aspect ratio</p>
+      </div>
+    </div>
+  );
+
+  return (
+    <Card className="p-4">
+      {/* Presets Section */}
+      {presets.length > 0 && (
+        <div className="mb-4">
+          <div className="flex items-center gap-2 mb-3">
+            <Sparkles className="h-4 w-4 text-primary" />
+            <h3 className="text-sm font-semibold">Quality Presets</h3>
+          </div>
+          <div className="grid grid-cols-2 md:grid-cols-4 gap-2">
+            {presets.map((preset) => (
+              <Button
+                key={preset.id}
+                onClick={() => handlePresetClick(preset)}
+                variant={selectedPreset === preset.id ? 'default' : 'outline'}
+                size="sm"
+                className="flex flex-col h-auto py-3 px-3 text-left items-start"
+                disabled={disabled}
+              >
+                <span className="text-base mb-1">{preset.icon}</span>
+                <span className="text-xs font-medium">{preset.name}</span>
+                <span className="text-xs text-muted-foreground mt-1">{preset.description}</span>
+              </Button>
+            ))}
+          </div>
+        </div>
+      )}
+
+      {/* Advanced Options Toggle */}
+      <button
+        onClick={() => setIsExpanded(!isExpanded)}
+        className="w-full flex items-center justify-between text-sm font-medium text-foreground hover:text-primary transition-colors mb-3"
+        disabled={disabled}
+      >
+        <span>Advanced Options</span>
+        {isExpanded ? <ChevronUp className="h-4 w-4" /> : <ChevronDown className="h-4 w-4" />}
+      </button>
+
+      {/* Advanced Options Panel */}
+      {isExpanded && (
+        <div className="pt-3 border-t border-border">
+          {outputFormat.category === 'video' && renderVideoOptions()}
+          {outputFormat.category === 'audio' && renderAudioOptions()}
+          {outputFormat.category === 'image' && renderImageOptions()}
+        </div>
+      )}
+    </Card>
+  );
+}

components/converter/ConversionPreview.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import * as React from 'react';
-import { Download, CheckCircle, XCircle, Loader2 } from 'lucide-react';
+import { Download, CheckCircle, XCircle, Loader2, Clock, TrendingUp, FileCheck2, ArrowRight } from 'lucide-react';
 import { cn } from '@/lib/utils/cn';
 import { Button } from '@/components/ui/Button';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/Card';
@@ -16,6 +16,32 @@ export interface ConversionPreviewProps {
 
 export function ConversionPreview({ job, onDownload }: ConversionPreviewProps) {
   const [previewUrl, setPreviewUrl] = React.useState<string | null>(null);
+  const [elapsedTime, setElapsedTime] = React.useState(0);
+  const [estimatedTimeRemaining, setEstimatedTimeRemaining] = React.useState<number | null>(null);
+
+  // Timer for elapsed time and estimation
+  React.useEffect(() => {
+    if (job.status === 'processing' || job.status === 'loading') {
+      const interval = setInterval(() => {
+        if (job.startTime) {
+          const elapsed = Date.now() - job.startTime;
+          setElapsedTime(elapsed);
+
+          // Estimate time remaining based on progress
+          if (job.progress > 5 && job.progress < 100) {
+            const progressRate = job.progress / elapsed;
+            const remainingProgress = 100 - job.progress;
+            const estimated = remainingProgress / progressRate;
+            setEstimatedTimeRemaining(estimated);
+          }
+        }
+      }, 100);
+
+      return () => clearInterval(interval);
+    } else {
+      setEstimatedTimeRemaining(null);
+    }
+  }, [job.status, job.startTime, job.progress]);
 
   // Create preview URL for result
   React.useEffect(() => {
@@ -77,44 +103,109 @@ export function ConversionPreview({ job, onDownload }: ConversionPreviewProps) {
     }
   };
 
+  const formatTime = (ms: number) => {
+    const seconds = Math.floor(ms / 1000);
+    if (seconds < 60) return `${seconds}s`;
+    const minutes = Math.floor(seconds / 60);
+    const remainingSeconds = seconds % 60;
+    return `${minutes}m ${remainingSeconds}s`;
+  };
+
   const renderStatus = () => {
     switch (job.status) {
       case 'loading':
         return (
+          <div className="space-y-3">
             <div className="flex items-center gap-2 text-info">
               <Loader2 className="h-4 w-4 animate-spin" />
-            <span className="text-sm font-medium">Loading converter...</span>
+              <span className="text-sm font-medium">Loading WASM converter...</span>
+            </div>
+            <div className="flex items-center gap-2 text-xs text-muted-foreground">
+              <Clock className="h-3.5 w-3.5" />
+              <span>Elapsed: {formatTime(elapsedTime)}</span>
+            </div>
           </div>
         );
 
       case 'processing':
         return (
-          <div>
-            <div className="flex items-center gap-2 text-info mb-2">
+          <div className="space-y-3">
+            <div className="flex items-center justify-between">
+              <div className="flex items-center gap-2 text-info">
                 <Loader2 className="h-4 w-4 animate-spin" />
                 <span className="text-sm font-medium">Converting...</span>
               </div>
-            <Progress value={job.progress} showLabel />
+              <span className="text-xs text-muted-foreground">{job.progress}%</span>
+            </div>
+            <Progress value={job.progress} showLabel={false} />
+            <div className="flex items-center gap-4 text-xs text-muted-foreground">
+              <div className="flex items-center gap-2">
+                <Clock className="h-3.5 w-3.5" />
+                <span>Elapsed: {formatTime(elapsedTime)}</span>
+              </div>
+              {estimatedTimeRemaining && (
+                <div className="flex items-center gap-2">
+                  <TrendingUp className="h-3.5 w-3.5" />
+                  <span>~{formatTime(estimatedTimeRemaining)} remaining</span>
+                </div>
+              )}
+            </div>
           </div>
         );
 
       case 'completed':
+        const inputSize = job.inputFile.size;
+        const outputSize = job.result?.size || 0;
+        const sizeReduction = inputSize > 0 ? ((inputSize - outputSize) / inputSize) * 100 : 0;
+
         return (
+          <div className="space-y-3">
             <div className="flex items-center gap-2 text-success">
-            <CheckCircle className="h-4 w-4" />
+              <CheckCircle className="h-5 w-5" />
               <span className="text-sm font-medium">Conversion complete!</span>
-            {job.result && (
-              <span className="text-xs text-muted-foreground ml-auto">
-                {formatFileSize(job.result.size)}
+            </div>
+
+            {/* File size comparison */}
+            <div className="bg-muted/50 rounded-lg p-3 space-y-2">
+              <div className="flex items-center justify-between text-sm">
+                <div className="flex items-center gap-2">
+                  <FileCheck2 className="h-4 w-4 text-muted-foreground" />
+                  <span className="text-muted-foreground">Input:</span>
+                </div>
+                <span className="font-medium">{formatFileSize(inputSize)}</span>
+              </div>
+
+              <div className="flex items-center justify-center py-1">
+                <ArrowRight className="h-4 w-4 text-muted-foreground" />
+              </div>
+
+              <div className="flex items-center justify-between text-sm">
+                <div className="flex items-center gap-2">
+                  <FileCheck2 className="h-4 w-4 text-muted-foreground" />
+                  <span className="text-muted-foreground">Output:</span>
+                </div>
+                <div className="flex items-center gap-2">
+                  <span className="font-medium">{formatFileSize(outputSize)}</span>
+                  {Math.abs(sizeReduction) > 1 && (
+                    <span className={cn(
+                      "text-xs px-2 py-0.5 rounded-full",
+                      sizeReduction > 0
+                        ? "bg-success/10 text-success"
+                        : "bg-info/10 text-info"
+                    )}>
+                      {sizeReduction > 0 ? '-' : '+'}{Math.abs(sizeReduction).toFixed(0)}%
                     </span>
                   )}
                 </div>
+              </div>
+            </div>
+          </div>
         );
 
       case 'error':
         return (
           <div className="flex items-center gap-2 text-destructive">
-            <XCircle className="h-4 w-4" />
+            <XCircle className="h-5 w-5" />
             <span className="text-sm font-medium">Conversion failed</span>
           </div>
         );

components/converter/FileConverter.tsx

@@ -7,6 +7,8 @@ import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/com
 import { FileUpload } from './FileUpload';
 import { FormatSelector } from './FormatSelector';
 import { ConversionPreview } from './ConversionPreview';
+import { ConversionOptionsPanel } from './ConversionOptions';
+import { FileInfo } from './FileInfo';
 import { useToast } from '@/components/ui/Toast';
 import {
   SUPPORTED_FORMATS,
@@ -17,7 +19,7 @@ import {
 import { convertWithFFmpeg } from '@/lib/converters/ffmpegService';
 import { convertWithImageMagick } from '@/lib/converters/imagemagickService';
 import { addToHistory } from '@/lib/storage/history';
-import type { ConversionJob, ConversionFormat } from '@/types/conversion';
+import type { ConversionJob, ConversionFormat, ConversionOptions } from '@/types/conversion';
 
 export function FileConverter() {
   const { addToast } = useToast();
@@ -27,6 +29,7 @@ export function FileConverter() {
   const [outputFormat, setOutputFormat] = React.useState<ConversionFormat | undefined>();
   const [compatibleFormats, setCompatibleFormats] = React.useState<ConversionFormat[]>([]);
   const [conversionJob, setConversionJob] = React.useState<ConversionJob | undefined>();
+  const [conversionOptions, setConversionOptions] = React.useState<ConversionOptions>({});
 
   // Detect input format when file is selected
   React.useEffect(() => {
@@ -77,7 +80,7 @@ export function FileConverter() {
       inputFile: selectedFile,
       inputFormat,
       outputFormat,
-      options: {},
+      options: conversionOptions,
       status: 'loading',
       progress: 0,
       startTime: Date.now(),
@@ -94,7 +97,7 @@ export function FileConverter() {
 
       switch (outputFormat.converter) {
         case 'ffmpeg':
-          result = await convertWithFFmpeg(selectedFile, outputFormat.extension, {}, (progress) => {
+          result = await convertWithFFmpeg(selectedFile, outputFormat.extension, conversionOptions, (progress) => {
             setConversionJob((prev) => prev && { ...prev, progress });
           });
           break;
@@ -103,7 +106,7 @@ export function FileConverter() {
           result = await convertWithImageMagick(
             selectedFile,
             outputFormat.extension,
-            {},
+            conversionOptions,
             (progress) => {
               setConversionJob((prev) => prev && { ...prev, progress });
             }
@@ -165,6 +168,7 @@ export function FileConverter() {
     setOutputFormat(undefined);
     setCompatibleFormats([]);
     setConversionJob(undefined);
+    setConversionOptions({});
   };
 
   const isConvertDisabled =
@@ -189,6 +193,11 @@ export function FileConverter() {
             disabled={conversionJob?.status === 'processing' || conversionJob?.status === 'loading'}
           />
 
+          {/* File Info */}
+          {selectedFile && inputFormat && (
+            <FileInfo file={selectedFile} format={inputFormat} />
+          )}
+
           {/* Format selection */}
           {inputFormat && compatibleFormats.length > 0 && (
             <div className="grid grid-cols-1 md:grid-cols-[1fr_auto_1fr] gap-4 items-start">
@@ -217,6 +226,17 @@ export function FileConverter() {
             </div>
           )}
 
+          {/* Conversion Options */}
+          {inputFormat && outputFormat && (
+            <ConversionOptionsPanel
+              inputFormat={inputFormat}
+              outputFormat={outputFormat}
+              options={conversionOptions}
+              onOptionsChange={setConversionOptions}
+              disabled={conversionJob?.status === 'processing' || conversionJob?.status === 'loading'}
+            />
+          )}
+
           {/* Convert button */}
           {inputFormat && outputFormat && (
             <div className="flex gap-3">

components/converter/FileInfo.tsx

@@ -0,0 +1,210 @@
+'use client';
+
+import * as React from 'react';
+import { File, FileVideo, FileAudio, FileImage, Clock, HardDrive, Film, Music } from 'lucide-react';
+import { Card } from '@/components/ui/Card';
+import type { ConversionFormat } from '@/types/conversion';
+
+interface FileInfoProps {
+  file: File;
+  format: ConversionFormat;
+}
+
+interface FileMetadata {
+  name: string;
+  size: string;
+  type: string;
+  category: string;
+  duration?: string;
+  dimensions?: string;
+}
+
+export function FileInfo({ file, format }: FileInfoProps) {
+  const [metadata, setMetadata] = React.useState<FileMetadata | null>(null);
+
+  React.useEffect(() => {
+    extractMetadata(file, format);
+  }, [file, format]);
+
+  const extractMetadata = async (file: File, format: ConversionFormat) => {
+    const sizeInMB = (file.size / (1024 * 1024)).toFixed(2);
+    const baseMetadata: FileMetadata = {
+      name: file.name,
+      size: file.size < 1024 * 1024 ? `${(file.size / 1024).toFixed(2)} KB` : `${sizeInMB} MB`,
+      type: format.name,
+      category: format.category,
+    };
+
+    // Try to extract media-specific metadata
+    if (format.category === 'video' && file.type.startsWith('video/')) {
+      try {
+        const video = document.createElement('video');
+        video.preload = 'metadata';
+
+        const promise = new Promise<FileMetadata>((resolve) => {
+          video.onloadedmetadata = () => {
+            const duration = video.duration;
+            const minutes = Math.floor(duration / 60);
+            const seconds = Math.floor(duration % 60);
+            const durationStr = `${minutes}:${seconds.toString().padStart(2, '0')}`;
+
+            resolve({
+              ...baseMetadata,
+              duration: durationStr,
+              dimensions: `${video.videoWidth} × ${video.videoHeight}`,
+            });
+
+            URL.revokeObjectURL(video.src);
+          };
+
+          video.onerror = () => {
+            resolve(baseMetadata);
+            URL.revokeObjectURL(video.src);
+          };
+        });
+
+        video.src = URL.createObjectURL(file);
+        const result = await promise;
+        setMetadata(result);
+        return;
+      } catch (error) {
+        console.error('Failed to extract video metadata:', error);
+      }
+    } else if (format.category === 'audio' && file.type.startsWith('audio/')) {
+      try {
+        const audio = document.createElement('audio');
+        audio.preload = 'metadata';
+
+        const promise = new Promise<FileMetadata>((resolve) => {
+          audio.onloadedmetadata = () => {
+            const duration = audio.duration;
+            const minutes = Math.floor(duration / 60);
+            const seconds = Math.floor(duration % 60);
+            const durationStr = `${minutes}:${seconds.toString().padStart(2, '0')}`;
+
+            resolve({
+              ...baseMetadata,
+              duration: durationStr,
+            });
+
+            URL.revokeObjectURL(audio.src);
+          };
+
+          audio.onerror = () => {
+            resolve(baseMetadata);
+            URL.revokeObjectURL(audio.src);
+          };
+        });
+
+        audio.src = URL.createObjectURL(file);
+        const result = await promise;
+        setMetadata(result);
+        return;
+      } catch (error) {
+        console.error('Failed to extract audio metadata:', error);
+      }
+    } else if (format.category === 'image' && file.type.startsWith('image/')) {
+      try {
+        const img = new Image();
+
+        const promise = new Promise<FileMetadata>((resolve) => {
+          img.onload = () => {
+            resolve({
+              ...baseMetadata,
+              dimensions: `${img.width} × ${img.height}`,
+            });
+
+            URL.revokeObjectURL(img.src);
+          };
+
+          img.onerror = () => {
+            resolve(baseMetadata);
+            URL.revokeObjectURL(img.src);
+          };
+        });
+
+        img.src = URL.createObjectURL(file);
+        const result = await promise;
+        setMetadata(result);
+        return;
+      } catch (error) {
+        console.error('Failed to extract image metadata:', error);
+      }
+    }
+
+    setMetadata(baseMetadata);
+  };
+
+  const getCategoryIcon = () => {
+    switch (format.category) {
+      case 'video':
+        return <FileVideo className="h-5 w-5 text-primary" />;
+      case 'audio':
+        return <FileAudio className="h-5 w-5 text-primary" />;
+      case 'image':
+        return <FileImage className="h-5 w-5 text-primary" />;
+      default:
+        return <File className="h-5 w-5 text-primary" />;
+    }
+  };
+
+  if (!metadata) {
+    return (
+      <Card className="p-4 animate-pulse">
+        <div className="flex items-start gap-3">
+          <div className="w-5 h-5 bg-secondary rounded"></div>
+          <div className="flex-1 space-y-2">
+            <div className="h-4 bg-secondary rounded w-3/4"></div>
+            <div className="h-3 bg-secondary rounded w-1/2"></div>
+          </div>
+        </div>
+      </Card>
+    );
+  }
+
+  return (
+    <Card className="p-4">
+      <div className="flex items-start gap-3">
+        <div className="mt-0.5">{getCategoryIcon()}</div>
+        <div className="flex-1 min-w-0">
+          <h3 className="text-sm font-medium text-foreground truncate" title={metadata.name}>
+            {metadata.name}
+          </h3>
+          <div className="mt-2 grid grid-cols-2 gap-2 text-xs">
+            {/* File Size */}
+            <div className="flex items-center gap-2 text-muted-foreground">
+              <HardDrive className="h-3.5 w-3.5" />
+              <span>{metadata.size}</span>
+            </div>
+
+            {/* Type */}
+            <div className="flex items-center gap-2 text-muted-foreground">
+              <File className="h-3.5 w-3.5" />
+              <span>{metadata.type}</span>
+            </div>
+
+            {/* Duration (for video/audio) */}
+            {metadata.duration && (
+              <div className="flex items-center gap-2 text-muted-foreground">
+                <Clock className="h-3.5 w-3.5" />
+                <span>{metadata.duration}</span>
+              </div>
+            )}
+
+            {/* Dimensions */}
+            {metadata.dimensions && (
+              <div className="flex items-center gap-2 text-muted-foreground">
+                {format.category === 'video' ? (
+                  <Film className="h-3.5 w-3.5" />
+                ) : (
+                  <FileImage className="h-3.5 w-3.5" />
+                )}
+                <span>{metadata.dimensions}</span>
+              </div>
+            )}
+          </div>
+        </div>
+      </div>
+    </Card>
+  );
+}

components/ui/Select.tsx

@@ -0,0 +1,51 @@
+import * as React from 'react';
+import { cn } from '@/lib/utils/cn';
+
+export interface SelectOption {
+  value: string;
+  label: string;
+}
+
+export interface SelectProps extends Omit<React.SelectHTMLAttributes<HTMLSelectElement>, 'onChange'> {
+  options: SelectOption[];
+  onValueChange?: (value: string) => void;
+  label?: string;
+}
+
+const Select = React.forwardRef<HTMLSelectElement, SelectProps>(
+  ({ className, options, onValueChange, label, value, ...props }, ref) => {
+    const handleChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
+      onValueChange?.(e.target.value);
+    };
+
+    return (
+      <div className="space-y-2">
+        {label && <label className="text-sm font-medium text-foreground">{label}</label>}
+        <select
+          value={value}
+          onChange={handleChange}
+          className={cn(
+            'flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm',
+            'ring-offset-background focus-visible:outline-none focus-visible:ring-2',
+            'focus-visible:ring-ring focus-visible:ring-offset-2',
+            'disabled:cursor-not-allowed disabled:opacity-50',
+            'cursor-pointer',
+            className
+          )}
+          ref={ref}
+          {...props}
+        >
+          {options.map((option) => (
+            <option key={option.value} value={option.value}>
+              {option.label}
+            </option>
+          ))}
+        </select>
+      </div>
+    );
+  }
+);
+
+Select.displayName = 'Select';
+
+export { Select };

components/ui/Slider.tsx

@@ -0,0 +1,64 @@
+import * as React from 'react';
+import { cn } from '@/lib/utils/cn';
+
+export interface SliderProps extends Omit<React.InputHTMLAttributes<HTMLInputElement>, 'type'> {
+  min?: number;
+  max?: number;
+  step?: number;
+  value?: number;
+  onValueChange?: (value: number) => void;
+  showValue?: boolean;
+  label?: string;
+  unit?: string;
+}
+
+const Slider = React.forwardRef<HTMLInputElement, SliderProps>(
+  ({ className, min = 0, max = 100, step = 1, value = 50, onValueChange, showValue = true, label, unit = '', ...props }, ref) => {
+    const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+      const newValue = parseFloat(e.target.value);
+      onValueChange?.(newValue);
+    };
+
+    return (
+      <div className="space-y-2">
+        {label && (
+          <div className="flex items-center justify-between">
+            <label className="text-sm font-medium text-foreground">{label}</label>
+            {showValue && (
+              <span className="text-sm text-muted-foreground">
+                {value}{unit}
+              </span>
+            )}
+          </div>
+        )}
+        <input
+          type="range"
+          min={min}
+          max={max}
+          step={step}
+          value={value}
+          onChange={handleChange}
+          className={cn(
+            'w-full h-2 bg-secondary rounded-lg appearance-none cursor-pointer',
+            '[&::-webkit-slider-thumb]:appearance-none [&::-webkit-slider-thumb]:w-4 [&::-webkit-slider-thumb]:h-4',
+            '[&::-webkit-slider-thumb]:rounded-full [&::-webkit-slider-thumb]:bg-primary',
+            '[&::-webkit-slider-thumb]:cursor-pointer [&::-webkit-slider-thumb]:transition-all',
+            '[&::-webkit-slider-thumb]:hover:scale-110',
+            '[&::-moz-range-thumb]:w-4 [&::-moz-range-thumb]:h-4 [&::-moz-range-thumb]:rounded-full',
+            '[&::-moz-range-thumb]:bg-primary [&::-moz-range-thumb]:border-0',
+            '[&::-moz-range-thumb]:cursor-pointer [&::-moz-range-thumb]:transition-all',
+            '[&::-moz-range-thumb]:hover:scale-110',
+            'disabled:opacity-50 disabled:cursor-not-allowed',
+            className
+          )}
+          ref={ref}
+          {...props}
+        />
+      </div>
+    );
+  }
+);
+
+Slider.displayName = 'Slider';
+
+export { Slider };