diff --git a/frontend/templates/partials/cloud_list.html b/frontend/templates/partials/cloud_list.html
index facbc7c..eae5342 100644
--- a/frontend/templates/partials/cloud_list.html
+++ b/frontend/templates/partials/cloud_list.html
@@ -6,22 +6,26 @@
         type="button"
         class="btn btn-ghost"
         hx-get="/viewer/list"
-        hx-target="#viewer-panel"
-        hx-trigger="click"
+        hx-target="#cloud-list-body"
+        hx-swap="innerHTML"
+        hx-indicator="#cloud-list-spinner"
       >
         🔄 Actualiser
       </button>
+      <span id="cloud-list-spinner" class="loading loading-spinner loading-sm htmx-indicator"></span>
     </div>
 
-    {% if error %}
+    <!-- ✅ CORRECTION BUG 1 : cible séparée du bouton -->
+    <div id="cloud-list-body">
+      {% if error %}
       <div class="alert alert-error">
         <span>{{ error }}</span>
       </div>
-    {% elif not pointclouds %}
+      {% elif not pointclouds %}
       <p class="text-base-content/40 text-sm text-center py-8">
         Aucun nuage disponible sur le serveur.
       </p>
-    {% else %}
+      {% else %}
       <p class="text-xs text-base-content/40 mb-3">{{ pointclouds|length }} nuage(s)</p>
       <div class="overflow-x-auto">
         <table class="table table-sm">
@@ -36,25 +40,42 @@
           </thead>
           <tbody id="cloud-table-body">
             {% for pc in pointclouds %}
-              <tr>
-                <td>{{ pc.id }}</td>
-                <td>{{ pc.size_mb }} MB</td>
-                <td>{{ pc.file_count }}</td>
-                <td>{{ pc.created|datetimeformat }}</td>
-                <td>
-                  <a href="/admin/debug/{{ pc.id }}" class="btn btn-sm btn-ghost">🔍</a>
-                  <a href="/viewer/{{ pc.id }}" class="btn btn-sm" target="_blank">👁️</a>
-                  <button
-                    type="button"
-                    class="btn btn-sm btn-error"
-                    onclick="if(confirm('Supprimer ce nuage ?')) window.location.href='/admin/delete/{{ pc.id }}'"
-                  >🗑️</button>
-                </td>
-              </tr>
+            <tr>
+              <td class="font-mono text-xs">{{ pc.id }}</td>
+              <td>{{ pc.size_mb }} MB</td>
+              <td>{{ pc.file_count }}</td>
+              <td>{{ pc.created|datetimeformat }}</td>
+              <td class="flex gap-1 flex-wrap">
+                <a href="/admin/debug/{{ pc.id }}" class="btn btn-sm btn-ghost">🔍</a>
+                <a href="/viewer/{{ pc.id }}" class="btn btn-sm" target="_blank">👁️</a>
+                <!-- ✅ NOUVEAU : bouton Crop qui charge la section crop dans #crop-panel -->
+                <button
+                  type="button"
+                  class="btn btn-sm btn-warning"
+                  hx-get="/crop?pc_id={{ pc.id }}"
+                  hx-target="#crop-panel"
+                  hx-swap="innerHTML"
+                  onclick="document.getElementById('crop-panel').scrollIntoView({behavior:'smooth'})"
+                >✂️</button>
+                <button
+                  type="button"
+                  class="btn btn-sm btn-error"
+                  hx-delete="/admin/delete/{{ pc.id }}"
+                  hx-target="#cloud-list-body"
+                  hx-swap="innerHTML"
+                  hx-confirm="Supprimer le nuage {{ pc.id }} ?"
+                >🗑️</button>
+              </td>
+            </tr>
             {% endfor %}
           </tbody>
         </table>
       </div>
-    {% endif %}
+      {% endif %}
+    </div>
+
   </div>
 </div>
+
+<!-- ✅ NOUVEAU : section crop injectée dynamiquement ici -->
+<div id="crop-panel" class="mt-4"></div>
\ No newline at end of file
diff --git a/frontend/templates/partials/cloud_list_body.html b/frontend/templates/partials/cloud_list_body.html
new file mode 100644
index 0000000..4e55c85
--- /dev/null
+++ b/frontend/templates/partials/cloud_list_body.html
@@ -0,0 +1,61 @@
+{% if error %}
+<div class="alert alert-error">
+  <span>{{ error }}</span>
+</div>
+
+{% elif not pointclouds %}
+<p class="text-base-content/40 text-sm text-center py-8">
+  Aucun nuage disponible sur le serveur.
+</p>
+
+{% else %}
+<p class="text-xs text-base-content/40 mb-3">{{ pointclouds|length }} nuage(s)</p>
+<div class="overflow-x-auto">
+  <table class="table table-sm">
+    <thead>
+      <tr>
+        <th>ID</th>
+        <th>Taille</th>
+        <th>Fichiers</th>
+        <th>Créé le</th>
+        <th>Actions</th>
+      </tr>
+    </thead>
+    <tbody>
+      {% for pc in pointclouds %}
+      <tr>
+        <td class="font-mono text-xs max-w-[120px] truncate" title="{{ pc.id }}">{{ pc.id }}</td>
+        <td>{{ pc.size_mb }} MB</td>
+        <td>{{ pc.file_count }}</td>
+        <td>{{ pc.created|datetimeformat }}</td>
+        <td>
+          <div class="flex gap-1 flex-wrap">
+            <a href="/admin/debug/{{ pc.id }}" class="btn btn-xs btn-ghost" title="Debug">🔍</a>
+            <a href="/viewer/{{ pc.id }}" class="btn btn-xs" target="_blank" title="Visualiser">👁️</a>
+            <!-- ✅ Bouton crop : charge crop_section.html dans #crop-panel (hors de ce div) -->
+            <button
+              type="button"
+              class="btn btn-xs btn-warning"
+              title="Cropper ce nuage"
+              hx-get="/crop?pc_id={{ pc.id }}"
+              hx-target="#crop-panel"
+              hx-swap="innerHTML"
+              hx-on:htmx:after-swap="document.getElementById('crop-panel').scrollIntoView({behavior:'smooth'})"
+            >✂️ Crop</button>
+            <button
+              type="button"
+              class="btn btn-xs btn-error"
+              title="Supprimer"
+              hx-delete="/admin/delete/{{ pc.id }}"
+              hx-target="#cloud-list-body"
+              hx-swap="innerHTML"
+              hx-confirm="Supprimer le nuage {{ pc.id }} ?"
+            >🗑️</button>
+          </div>
+        </td>
+      </tr>
+      {% endfor %}
+    </tbody>
+  </table>
+</div>
+{% endif %}
\ No newline at end of file
diff --git a/frontend/templates/partials/crop_section.html b/frontend/templates/partials/crop_section.html
new file mode 100644
index 0000000..20ca5df
--- /dev/null
+++ b/frontend/templates/partials/crop_section.html
@@ -0,0 +1,157 @@
+<!-- crop_section.html — injecté dans #crop-panel (hors de viewer-panel) -->
+<div class="card bg-base-100 shadow border border-warning/30" x-data="cropForm()">
+  <div class="card-body">
+
+    <!-- En-tête -->
+    <div class="flex items-center justify-between mb-2">
+      <h2 class="card-title text-base">
+        ✂️ Crop du nuage
+        <span class="badge badge-warning font-mono text-xs">{{ pc_id }}</span>
+      </h2>
+      <button
+        type="button"
+        class="btn btn-ghost btn-sm"
+        onclick="document.getElementById('crop-panel').innerHTML = ''"
+      >✕ Fermer</button>
+    </div>
+
+    <p class="text-sm text-base-content/60 mb-4">
+      Renseignez les coordonnées de la boîte 3D à découper. Les valeurs sont dans
+      le système de coordonnées du nuage de points (en mètres ou en unités du fichier source).
+    </p>
+
+    <!-- Schéma visuel de la box -->
+    <div class="bg-base-200 rounded-lg p-4 mb-4 flex items-center justify-center gap-8">
+      <div class="text-center">
+        <div class="text-xs text-base-content/50 mb-1">Vue de dessus (XY)</div>
+        <svg width="110" height="75" viewBox="0 0 110 75">
+          <ellipse cx="55" cy="37" rx="50" ry="30" fill="none" stroke="currentColor" stroke-opacity="0.15" stroke-width="1" stroke-dasharray="3 2"/>
+          <rect x="18" y="14" width="74" height="46" rx="2" fill="none" stroke="#f59e0b" stroke-width="1.5" stroke-dasharray="4 2"/>
+          <text x="100" y="40" font-size="9" fill="currentColor" opacity="0.4">X</text>
+          <text x="52" y="9"  font-size="9" fill="currentColor" opacity="0.4">Y</text>
+        </svg>
+      </div>
+      <div class="text-center">
+        <div class="text-xs text-base-content/50 mb-1">Vue de côté (XZ)</div>
+        <svg width="110" height="75" viewBox="0 0 110 75">
+          <ellipse cx="55" cy="37" rx="50" ry="25" fill="none" stroke="currentColor" stroke-opacity="0.15" stroke-width="1" stroke-dasharray="3 2"/>
+          <rect x="18" y="16" width="74" height="42" rx="2" fill="none" stroke="#f59e0b" stroke-width="1.5" stroke-dasharray="4 2"/>
+          <text x="100" y="40" font-size="9" fill="currentColor" opacity="0.4">X</text>
+          <text x="52" y="9"  font-size="9" fill="currentColor" opacity="0.4">Z</text>
+        </svg>
+      </div>
+    </div>
+
+    <!-- Formulaire -->
+    <form
+      hx-post="/admin/crop/{{ pc_id }}"
+      hx-target="#crop-result"
+      hx-swap="innerHTML"
+      hx-indicator="#crop-spinner"
+    >
+
+      <div class="grid grid-cols-1 sm:grid-cols-3 gap-4 mb-4">
+
+        <!-- X -->
+        <div>
+          <div class="text-xs font-semibold text-base-content/50 uppercase tracking-wider mb-2">Axe X</div>
+          <div class="flex flex-col gap-2">
+            <div>
+              <label class="label py-0 pb-1"><span class="label-text text-xs">Min X</span></label>
+              <input type="number" step="any" name="minX" x-model="box.minX"
+                class="input input-bordered input-sm w-full font-mono" placeholder="ex: 100.0" required/>
+            </div>
+            <div>
+              <label class="label py-0 pb-1"><span class="label-text text-xs">Max X</span></label>
+              <input type="number" step="any" name="maxX" x-model="box.maxX"
+                class="input input-bordered input-sm w-full font-mono" placeholder="ex: 500.0" required/>
+            </div>
+          </div>
+        </div>
+
+        <!-- Y -->
+        <div>
+          <div class="text-xs font-semibold text-base-content/50 uppercase tracking-wider mb-2">Axe Y</div>
+          <div class="flex flex-col gap-2">
+            <div>
+              <label class="label py-0 pb-1"><span class="label-text text-xs">Min Y</span></label>
+              <input type="number" step="any" name="minY" x-model="box.minY"
+                class="input input-bordered input-sm w-full font-mono" placeholder="ex: 200.0" required/>
+            </div>
+            <div>
+              <label class="label py-0 pb-1"><span class="label-text text-xs">Max Y</span></label>
+              <input type="number" step="any" name="maxY" x-model="box.maxY"
+                class="input input-bordered input-sm w-full font-mono" placeholder="ex: 800.0" required/>
+            </div>
+          </div>
+        </div>
+
+        <!-- Z -->
+        <div>
+          <div class="text-xs font-semibold text-base-content/50 uppercase tracking-wider mb-2">Axe Z (altitude)</div>
+          <div class="flex flex-col gap-2">
+            <div>
+              <label class="label py-0 pb-1"><span class="label-text text-xs">Min Z</span></label>
+              <input type="number" step="any" name="minZ" x-model="box.minZ"
+                class="input input-bordered input-sm w-full font-mono" placeholder="ex: 10.0" required/>
+            </div>
+            <div>
+              <label class="label py-0 pb-1"><span class="label-text text-xs">Max Z</span></label>
+              <input type="number" step="any" name="maxZ" x-model="box.maxZ"
+                class="input input-bordered input-sm w-full font-mono" placeholder="ex: 50.0" required/>
+            </div>
+          </div>
+        </div>
+
+      </div>
+
+      <!-- Résumé dimensions en temps réel -->
+      <div class="bg-base-200 rounded p-3 mb-4 text-xs font-mono" x-show="isValid()">
+        <span class="text-base-content/60 mr-2">Dimensions :</span>
+        <span class="text-warning">ΔX=<span x-text="delta('X')"></span></span>
+        <span class="mx-2 text-base-content/30">|</span>
+        <span class="text-warning">ΔY=<span x-text="delta('Y')"></span></span>
+        <span class="mx-2 text-base-content/30">|</span>
+        <span class="text-warning">ΔZ=<span x-text="delta('Z')"></span></span>
+      </div>
+
+      <div class="flex items-center gap-3">
+        <button
+          type="submit"
+          class="btn btn-warning"
+          :disabled="!isValid()"
+        >
+          ✂️ Lancer le crop
+        </button>
+        <div id="crop-spinner" class="loading loading-spinner loading-sm htmx-indicator text-warning"></div>
+        <span class="text-xs text-base-content/50">Traitement PDAL — peut prendre plusieurs minutes</span>
+      </div>
+
+    </form>
+
+    <div id="crop-result" class="mt-4"></div>
+  </div>
+</div>
+
+<script>
+function cropForm() {
+  return {
+    box: { minX: '', minY: '', minZ: '', maxX: '', maxY: '', maxZ: '' },
+    isValid() {
+      const keys = ['minX', 'minY', 'minZ', 'maxX', 'maxY', 'maxZ'];
+      if (keys.some(k => this.box[k] === '' || isNaN(parseFloat(this.box[k])))) return false;
+      return (
+        parseFloat(this.box.minX) < parseFloat(this.box.maxX) &&
+        parseFloat(this.box.minY) < parseFloat(this.box.maxY) &&
+        parseFloat(this.box.minZ) < parseFloat(this.box.maxZ)
+      );
+    },
+    delta(axis) {
+      const min = parseFloat(this.box['min' + axis]);
+      const max = parseFloat(this.box['max' + axis]);
+      if (isNaN(min) || isNaN(max) || min >= max) return '—';
+      return (max - min).toFixed(3);
+    }
+  }
+}
+</script>
\ No newline at end of file
diff --git a/frontend/templates/partials/upload_form.html b/frontend/templates/partials/upload_form.html
new file mode 100644
index 0000000..700ee0e
--- /dev/null
+++ b/frontend/templates/partials/upload_form.html
@@ -0,0 +1,71 @@
+<!-- upload_form.html — partial HTMX uniquement (sans navbar ni layout) -->
+<!-- Injecté dans #main-content lors du clic sur le tab Upload -->
+
+<div class="grid grid-cols-1 lg:grid-cols-3 gap-6">
+
+  <!-- Colonne gauche : upload -->
+  <div class="lg:col-span-1 flex flex-col gap-4">
+    <!-- Configuration Backend -->
+    <div id="backend-config-panel" hx-get="/admin/backend-config" hx-target="this" hx-swap="innerHTML" hx-trigger="load">
+      {% include "partials/backend_config.html" %}
+    </div>
+
+    <div class="card bg-base-100 shadow">
+      <div class="card-body">
+        <h2 class="card-title text-base mb-2">📤 Upload</h2>
+        <p class="text-sm text-base-content/60 mb-3">
+          Formats acceptés : LAS, LAZ, PLY, XYZ, PTS
+        </p>
+        <form
+          hx-post="/upload"
+          hx-target="#upload-result"
+          hx-swap="innerHTML"
+          hx-encoding="multipart/form-data"
+          hx-indicator="#upload-spinner"
+        >
+          <input
+            type="file"
+            name="file"
+            accept=".las,.laz,.ply,.xyz,.pts"
+            class="file-input file-input-bordered w-full mb-4"
+            required
+          >
+          <div class="flex items-center gap-3">
+            <button
+              type="submit"
+              class="btn"
+            >
+              📤 Uploader & convertir
+            </button>
+            <div id="upload-spinner" class="loading loading-spinner loading-sm htmx-indicator"></div>
+          </div>
+        </form>
+      </div>
+    </div>
+
+    <div id="upload-result"></div>
+  </div>
+
+  <!-- Colonne droite : viewer -->
+  <div class="lg:col-span-2">
+    <div
+      id="viewer-container"
+      class="card bg-base-100 shadow min-h-[600px] flex items-center justify-center"
+    >
+      <p class="text-base-content/40 text-sm">
+        Uploadez un fichier pour lancer la visualisation
+      </p>
+    </div>
+    <div
+      id="viewer-panel"
+      class="card bg-base-100 shadow mt-4"
+      hx-get="/viewer/list"
+      hx-target="#cloud-list-body"
+      hx-swap="innerHTML"
+      hx-trigger="load"
+    >
+      {% include "partials/cloud_list.html" %}
+    </div>
+  </div>
+
+</div>
\ No newline at end of file