diff --git a/frontend/src/components/file-uploader.tsx b/frontend/src/components/file-uploader.tsx
index 6ac3081..bc7db24 100644
--- a/frontend/src/components/file-uploader.tsx
+++ b/frontend/src/components/file-uploader.tsx
@@ -2,15 +2,16 @@
 
 import { useState, useCallback, useEffect } from "react";
 import { useDropzone } from "react-dropzone";
-import { Upload, FileText, FileSpreadsheet, Presentation, X, Download, Loader2, Cpu, AlertTriangle } from "lucide-react";
+import { Upload, FileText, FileSpreadsheet, Presentation, X, Download, Loader2, Cpu, AlertTriangle, Brain } from "lucide-react";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
 import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { Progress } from "@/components/ui/progress";
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select";
 import { Label } from "@/components/ui/label";
+import { Textarea } from "@/components/ui/textarea";
 import { Switch } from "@/components/ui/switch";
-import { useTranslationStore } from "@/lib/store";
+import { useTranslationStore, openaiModels, openrouterModels } from "@/lib/store";
 import { translateDocument, languages, providers, extractTextsFromDocument, reconstructDocument, TranslatedText } from "@/lib/api";
 import { useWebLLM } from "@/lib/webllm";
 import { cn } from "@/lib/utils";
@@ -323,7 +324,7 @@ export function FileUploader() {
         <CardHeader>
           <CardTitle className="text-white">Translation Options</CardTitle>
           <CardDescription>
-            Select your target language and start translating
+            Configure your translation settings
           </CardDescription>
         </CardHeader>
         <CardContent className="space-y-6">
@@ -351,6 +352,133 @@ export function FileUploader() {
             </Select>
           </div>
 
+          {/* Provider Selection */}
+          <div className="space-y-2">
+            <Label htmlFor="provider" className="text-zinc-300">Translation Provider</Label>
+            <Select value={provider} onValueChange={(v) => setProvider(v as ProviderType)}>
+              <SelectTrigger id="provider" className="bg-zinc-800 border-zinc-700 text-white">
+                <SelectValue placeholder="Select provider" />
+              </SelectTrigger>
+              <SelectContent className="bg-zinc-800 border-zinc-700">
+                {providers.map((p) => (
+                  <SelectItem
+                    key={p.id}
+                    value={p.id}
+                    className="text-white hover:bg-zinc-700"
+                  >
+                    <span className="flex items-center gap-2">
+                      <span>{p.icon}</span>
+                      <span>{p.name}</span>
+                    </span>
+                  </SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </div>
+
+          {/* OpenAI Model Selection */}
+          {provider === "openai" && (
+            <div className="space-y-2">
+              <Label htmlFor="openai-model" className="text-zinc-300">OpenAI Model</Label>
+              <Select 
+                value={settings.openaiModel} 
+                onValueChange={(v) => useTranslationStore.getState().updateSettings({ openaiModel: v })}
+              >
+                <SelectTrigger id="openai-model" className="bg-zinc-800 border-zinc-700 text-white">
+                  <SelectValue placeholder="Select model" />
+                </SelectTrigger>
+                <SelectContent className="bg-zinc-800 border-zinc-700">
+                  {openaiModels.map((m) => (
+                    <SelectItem
+                      key={m.id}
+                      value={m.id}
+                      className="text-white hover:bg-zinc-700"
+                    >
+                      <div className="flex flex-col">
+                        <span>{m.name}</span>
+                        <span className="text-xs text-zinc-500">{m.description}</span>
+                      </div>
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+              {!settings.openaiApiKey && (
+                <p className="text-xs text-amber-400">⚠️ API key required in Settings</p>
+              )}
+            </div>
+          )}
+
+          {/* OpenRouter Model Selection */}
+          {provider === "openrouter" && (
+            <div className="space-y-2">
+              <Label htmlFor="openrouter-model" className="text-zinc-300">OpenRouter Model</Label>
+              <Select 
+                value={settings.openrouterModel} 
+                onValueChange={(v) => useTranslationStore.getState().updateSettings({ openrouterModel: v })}
+              >
+                <SelectTrigger id="openrouter-model" className="bg-zinc-800 border-zinc-700 text-white">
+                  <SelectValue placeholder="Select model" />
+                </SelectTrigger>
+                <SelectContent className="bg-zinc-800 border-zinc-700">
+                  {openrouterModels.map((m) => (
+                    <SelectItem
+                      key={m.id}
+                      value={m.id}
+                      className="text-white hover:bg-zinc-700"
+                    >
+                      <div className="flex flex-col">
+                        <span>{m.name}</span>
+                        <span className="text-xs text-zinc-500">{m.description}</span>
+                      </div>
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+              {!settings.openrouterApiKey && (
+                <p className="text-xs text-amber-400">⚠️ API key required in Settings</p>
+              )}
+            </div>
+          )}
+
+          {/* Context Section - Only for LLM providers */}
+          {(provider === "openai" || provider === "openrouter" || provider === "ollama") && (
+            <div className="space-y-4 p-4 bg-zinc-800/50 rounded-lg border border-zinc-700">
+              <div className="flex items-center justify-between">
+                <Label className="text-zinc-300 flex items-center gap-2">
+                  <Brain className="h-4 w-4 text-teal-400" />
+                  Translation Context
+                </Label>
+                <Badge variant="outline" className="border-teal-500/50 text-teal-400 text-xs">
+                  LLM Only
+                </Badge>
+              </div>
+              
+              {/* System Prompt */}
+              <div className="space-y-2">
+                <Label htmlFor="system-prompt" className="text-zinc-400 text-sm">Instructions for the AI</Label>
+                <Textarea
+                  id="system-prompt"
+                  value={settings.systemPrompt}
+                  onChange={(e: React.ChangeEvent<HTMLTextAreaElement>) => useTranslationStore.getState().updateSettings({ systemPrompt: e.target.value })}
+                  placeholder="E.g., You are translating technical HVAC documentation. Keep unit measurements unchanged. Use formal language..."
+                  className="bg-zinc-900 border-zinc-700 text-white placeholder:text-zinc-600 min-h-[80px] text-sm"
+                />
+              </div>
+
+              {/* Glossary */}
+              <div className="space-y-2">
+                <Label htmlFor="glossary" className="text-zinc-400 text-sm">Glossary (term=translation, one per line)</Label>
+                <Textarea
+                  id="glossary"
+                  value={settings.glossary}
+                  onChange={(e: React.ChangeEvent<HTMLTextAreaElement>) => useTranslationStore.getState().updateSettings({ glossary: e.target.value })}
+                  placeholder="compressor=compresseur&#10;evaporator=évaporateur&#10;condenser=condenseur"
+                  className="bg-zinc-900 border-zinc-700 text-white placeholder:text-zinc-600 min-h-[80px] text-sm font-mono"
+                />
+              </div>
+            </div>
+          )}
+
           {/* Translate Button */}
           <Button
             onClick={handleTranslate}
diff --git a/frontend/src/components/sidebar.tsx b/frontend/src/components/sidebar.tsx
index 99939f6..063668a 100644
--- a/frontend/src/components/sidebar.tsx
+++ b/frontend/src/components/sidebar.tsx
@@ -10,6 +10,8 @@ import {
   LogIn,
   Crown,
   LogOut,
+  Settings,
+  BookOpen,
 } from "lucide-react";
 import {
   Tooltip,