diff --git a/web/app.py b/web/app.py
index 6fb763b..067822c 100644
--- a/web/app.py
+++ b/web/app.py
@@ -11,7 +11,7 @@ import os
 import secrets
 
 from fastapi import Depends, FastAPI, File, Form, HTTPException, Request, UploadFile, status
-from fastapi.responses import FileResponse, HTMLResponse
+from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
 from fastapi.security import HTTPBasic, HTTPBasicCredentials
 from fastapi.templating import Jinja2Templates
 from starlette.background import BackgroundTask
@@ -55,6 +55,58 @@ def index(request: Request, _: None = Depends(require_auth)):
     )
 
 
+@app.post("/preview")
+async def preview_pdf(
+    file: UploadFile = File(...),
+    _: None = Depends(require_auth),
+):
+    filename = file.filename or "dienstplan.pdf"
+    if not filename.lower().endswith(".pdf"):
+        return JSONResponse(
+            {"error": "Bitte eine PDF-Datei hochladen."},
+            status_code=400,
+        )
+
+    data = await file.read()
+    if not data:
+        return JSONResponse(
+            {"error": "Die Datei ist leer."},
+            status_code=400,
+        )
+
+    with tempfile.TemporaryDirectory(prefix="pdf_to_ics_web_preview_") as temp_dir:
+        temp_dir_path = Path(temp_dir)
+        pdf_path = temp_dir_path / "upload.pdf"
+        pdf_path.write_bytes(data)
+
+        dienstplan = extract_dienstplan_data(str(pdf_path))
+        if not dienstplan.get("events"):
+            return JSONResponse(
+                {"error": "Keine Dienstplan-Events in der PDF gefunden."},
+                status_code=422,
+            )
+
+        events_preview = []
+        for event in dienstplan["events"]:
+            events_preview.append({
+                "date": event["date"].strftime("%d.%m.%Y") if event["date"] else "",
+                "service": event["service"] or "—",
+                "time": f"{event['start_time']}-{event['end_time']}" if event["start_time"] and event["end_time"] else "—",
+            })
+
+        return JSONResponse({
+            "success": True,
+            "filename": filename,
+            "metadata": {
+                "name": f"{dienstplan.get('vorname', '')} {dienstplan.get('name', '')}".strip(),
+                "personalnummer": dienstplan.get("personalnummer", "—"),
+                "betriebshof": dienstplan.get("betriebshof", "—"),
+                "count": len(dienstplan["events"]),
+            },
+            "events": events_preview,
+        })
+
+
 @app.post("/convert")
 async def convert_pdf(
     request: Request,
diff --git a/web/templates/index.html b/web/templates/index.html
index 2944f0b..e8f8ff0 100644
--- a/web/templates/index.html
+++ b/web/templates/index.html
@@ -6,6 +6,7 @@
   <title>PDF zu ICS (Web)</title>
   <style>
     :root { color-scheme: light; }
+    * { box-sizing: border-box; }
     body {
       margin: 0;
       font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
@@ -13,7 +14,7 @@
       color: #1f2937;
     }
     .wrap {
-      max-width: 520px;
+      max-width: 600px;
       margin: 0 auto;
       padding: 20px 14px 28px;
     }
@@ -24,7 +25,7 @@
       box-shadow: 0 1px 4px rgba(0,0,0,0.08);
     }
     h1 {
-      margin: 0 0 10px;
+      margin: 0 0 6px;
       font-size: 1.3rem;
     }
     p {
@@ -43,7 +44,6 @@
       border: 1px solid #d1d5db;
       border-radius: 10px;
       background: #fff;
-      box-sizing: border-box;
     }
     .options {
       margin: 12px 0;
@@ -68,8 +68,14 @@
       color: #fff;
       margin-top: 6px;
       cursor: pointer;
+      transition: background 0.2s;
     }
+    button:hover { background: #1d4ed8; }
     button:active { transform: translateY(1px); }
+    button:disabled {
+      background: #9ca3af;
+      cursor: not-allowed;
+    }
     .error {
       margin: 0 0 12px;
       padding: 10px;
@@ -83,38 +89,282 @@
       font-size: 0.9rem;
       color: #6b7280;
     }
+    .hidden { display: none; }
+    .preview-header {
+      margin: 0 0 12px;
+      padding: 12px;
+      background: #f0f9ff;
+      border-radius: 10px;
+      border-left: 3px solid #2563eb;
+    }
+    .preview-meta {
+      font-size: 0.9rem;
+      display: grid;
+      grid-template-columns: 1fr 1fr;
+      gap: 8px;
+      margin: 8px 0 0;
+    }
+    .preview-meta-item {
+      color: #4b5563;
+    }
+    .preview-meta-label {
+      font-weight: 600;
+      color: #1f2937;
+    }
+    .preview-table {
+      width: 100%;
+      border-collapse: collapse;
+      font-size: 0.9rem;
+      margin: 12px 0;
+    }
+    .preview-table thead {
+      background: #f3f4f6;
+    }
+    .preview-table th, .preview-table td {
+      padding: 8px;
+      text-align: left;
+      border-bottom: 1px solid #e5e7eb;
+    }
+    .preview-table th {
+      font-weight: 600;
+      color: #374151;
+    }
+    .preview-table tbody tr:hover {
+      background: #fafafa;
+    }
+    .actions {
+      display: grid;
+      grid-template-columns: 1fr 1fr;
+      gap: 8px;
+    }
+    .actions button {
+      margin-top: 0;
+    }
+    .btn-secondary {
+      background: #6b7280;
+    }
+    .btn-secondary:hover {
+      background: #4b5563;
+    }
+    .spinner {
+      display: inline-block;
+      width: 12px;
+      height: 12px;
+      border: 2px solid #e5e7eb;
+      border-top-color: #2563eb;
+      border-radius: 50%;
+      animation: spin 0.6s linear infinite;
+    }
+    @keyframes spin {
+      to { transform: rotate(360deg); }
+    }
   </style>
 </head>
 <body>
   <main class="wrap">
     <section class="card">
       <h1>PDF zu ICS Konverter</h1>
-      <p>PDF hochladen, konvertieren und die ICS-Datei direkt herunterladen.</p>
+      <p>PDF hochladen, Vorschau prüfen und herunterladen.</p>
 
-      {% if error %}
-      <div class="error">{{ error }}</div>
-      {% endif %}
+      <div id="error" class="error hidden"></div>
 
-      <form action="/convert" method="post" enctype="multipart/form-data">
+      <!-- UPLOAD-FORMULAR -->
+      <div id="step-init">
         <label for="file">Dienstplan-PDF</label>
-        <input id="file" name="file" type="file" accept="application/pdf,.pdf" required />
+        <input id="file" type="file" accept="application/pdf,.pdf" />
 
         <div class="options">
           <label class="option">
-            <input type="checkbox" name="exclude_rest" value="true" />
+            <input id="exclude_rest" type="checkbox" />
             Ruhetage ausschließen
           </label>
           <label class="option">
-            <input type="checkbox" name="exclude_vacation" value="true" />
+            <input id="exclude_vacation" type="checkbox" />
             Urlaub ausschließen
           </label>
         </div>
 
-        <button type="submit">ICS erstellen</button>
-      </form>
+        <button type="button" onclick="uploadAndPreview()">
+          Vorschau laden
+        </button>
 
-      <div class="hint">Hinweis: Die Datei wird nur temporär für die Konvertierung verarbeitet.</div>
+        <div class="hint">Hinweis: Die Datei wird nur temporär verarbeitet.</div>
+      </div>
+
+      <!-- PREVIEW -->
+      <div id="step2" class="hidden">
+        <div class="preview-header">
+          <div style="font-weight: 600; font-size: 0.95rem;" id="preview-name"></div>
+          <div class="preview-meta">
+            <div class="preview-meta-item">
+              <div class="preview-meta-label">Personalnummer</div>
+              <div id="preview-personalnummer">—</div>
+            </div>
+            <div class="preview-meta-item">
+              <div class="preview-meta-label">Betriebshof</div>
+              <div id="preview-betriebshof">—</div>
+            </div>
+          </div>
+          <div style="margin-top: 8px; color: #4b5563;">
+            <strong id="preview-count"></strong> Ereignisse gefunden
+          </div>
+        </div>
+
+        <table class="preview-table">
+          <thead>
+            <tr>
+              <th>Datum</th>
+              <th>Dienstart</th>
+              <th>Zeit</th>
+            </tr>
+          </thead>
+          <tbody id="preview-events"></tbody>
+        </table>
+
+        <div class="actions">
+          <button type="button" class="btn-secondary" onclick="resetForm()">Erneut hochladen</button>
+          <button type="button" onclick="downloadICS()">ICS herunterladen</button>
+        </div>
+      </div>
     </section>
   </main>
+
+  <script>
+    let currentFile = null;
+    let currentFilename = null;
+
+    async function uploadAndPreview() {
+      const fileInput = document.getElementById("file");
+      currentFile = fileInput.files[0];
+      currentFilename = currentFile?.name;
+
+      if (!currentFile) {
+        showError("Bitte eine PDF-Datei auswählen.");
+        return;
+      }
+
+      const btn = event.target;
+      btn.disabled = true;
+      btn.innerHTML = '<span class="spinner"></span> Lädt Vorschau...';
+
+      try {
+        const formData = new FormData();
+        formData.append("file", currentFile);
+
+        const response = await fetch("/preview", {
+          method: "POST",
+          body: formData,
+        });
+
+        if (!response.ok) {
+          const data = await response.json();
+          showError(data.error || "Fehler beim Hochladen");
+          btn.disabled = false;
+          btn.textContent = "Vorschau laden";
+          return;
+        }
+
+        const data = await response.json();
+        if (!data.success) {
+          showError(data.error || "Fehler beim Vorschau-Laden");
+          btn.disabled = false;
+          btn.textContent = "Vorschau laden";
+          return;
+        }
+
+        showPreview(data);
+        hide("step-init");
+        show("step2");
+      } catch (error) {
+        showError(`Fehler: ${error.message}`);
+        btn.disabled = false;
+        btn.textContent = "Vorschau laden";
+      }
+    }
+
+    function showPreview(data) {
+      const { metadata, events } = data;
+
+      document.getElementById("preview-name").textContent = metadata.name;
+      document.getElementById("preview-personalnummer").textContent = metadata.personalnummer;
+      document.getElementById("preview-betriebshof").textContent = metadata.betriebshof;
+      document.getElementById("preview-count").textContent = metadata.count;
+
+      const tbody = document.getElementById("preview-events");
+      tbody.innerHTML = "";
+      events.forEach((event) => {
+        const tr = document.createElement("tr");
+        tr.innerHTML = `<td>${event.date}</td><td>${event.service}</td><td>${event.time}</td>`;
+        tbody.appendChild(tr);
+      });
+    }
+
+    async function downloadICS() {
+      const btn = event.target;
+      btn.disabled = true;
+      btn.innerHTML = '<span class="spinner"></span> Download...';
+
+      try {
+        const formData = new FormData();
+        formData.append("file", currentFile);
+        formData.append("exclude_rest", document.getElementById("exclude_rest").checked);
+        formData.append("exclude_vacation", document.getElementById("exclude_vacation").checked);
+
+        const response = await fetch("/convert", {
+          method: "POST",
+          body: formData,
+        });
+
+        if (!response.ok) {
+          showError("Fehler beim Download");
+          btn.disabled = false;
+          btn.textContent = "ICS herunterladen";
+          return;
+        }
+
+        const blob = await response.blob();
+        const url = window.URL.createObjectURL(blob);
+        const a = document.createElement("a");
+        a.href = url;
+        a.download = currentFilename.replace(/\.pdf$/i, ".ics");
+        document.body.appendChild(a);
+        a.click();
+        window.URL.revokeObjectURL(url);
+        a.remove();
+
+        resetForm();
+      } catch (error) {
+        showError(`Fehler: ${error.message}`);
+        btn.disabled = false;
+        btn.textContent = "ICS herunterladen";
+      }
+    }
+
+    function resetForm() {
+      document.getElementById("file").value = "";
+      document.getElementById("exclude_rest").checked = false;
+      document.getElementById("exclude_vacation").checked = false;
+      currentFile = null;
+      currentFilename = null;
+
+      hide("step2");
+      show("step-init");
+      hide("error");
+    }
+
+    function showError(message) {
+      const el = document.getElementById("error");
+      el.textContent = message;
+      show("error");
+    }
+
+    function show(id) {
+      document.getElementById(id).classList.remove("hidden");
+    }
+
+    function hide(id) {
+      document.getElementById(id).classList.add("hidden");
+    }
+  </script>
 </body>
 </html>