diff --git a/electron/main.js b/electron/main.js
index edb5131..7aadda2 100644
--- a/electron/main.js
+++ b/electron/main.js
@@ -10,8 +10,24 @@ const { spawn } = require('child_process');
 const http = require('http');
 const https = require('https');
 const QRCode = require('qrcode');
+const yaml = require('yaml');
 const setupHelper = require('./setup-helper');
 
+const CONFIG_PATH = path.join(__dirname, '..', 'server', 'config', 'config.yaml');
+
+function readConfig() {
+  return yaml.parse(fs.readFileSync(CONFIG_PATH, 'utf8'));
+}
+
+function writeConfig(config) {
+  fs.writeFileSync(CONFIG_PATH, yaml.stringify(config), 'utf8');
+}
+
+function slugify(text) {
+  return text.toString().normalize('NFD').replace(/[̀-ͯ]/g, '')
+    .toLowerCase().trim().replace(/\s+/g, '-').replace(/[^\w-]+/g, '').replace(/--+/g, '-');
+}
+
 // État de l'application
 let mainWindow = null;
 let tray = null;
@@ -366,6 +382,60 @@ app.whenReady().then(async () => {
     return setupHelper.getNetworkIP();
   });
 
+  // ========== Groupes (lecture/écriture YAML directe, sans serveur) ==========
+
+  ipcMain.handle('groups:list', () => {
+    try {
+      const config = readConfig();
+      return { groups: config.groups || [] };
+    } catch (error) {
+      return { groups: [], error: error.message };
+    }
+  });
+
+  ipcMain.handle('groups:create', (event, { name, audioBitrate }) => {
+    try {
+      const config = readConfig();
+      const id = slugify(name);
+      if ((config.groups || []).find(g => slugify(g.name) === id)) {
+        return { success: false, error: `Un groupe "${name}" existe déjà` };
+      }
+      const group = { name, ...(audioBitrate ? { audioBitrate } : {}) };
+      config.groups = [...(config.groups || []), group];
+      writeConfig(config);
+      return { success: true, group };
+    } catch (error) {
+      return { success: false, error: error.message };
+    }
+  });
+
+  ipcMain.handle('groups:update', (event, { id, name, audioBitrate }) => {
+    try {
+      const config = readConfig();
+      const idx = (config.groups || []).findIndex(g => slugify(g.name) === id);
+      if (idx === -1) return { success: false, error: `Groupe ${id} introuvable` };
+      if (name !== undefined) config.groups[idx].name = name;
+      if (audioBitrate !== undefined) config.groups[idx].audioBitrate = audioBitrate;
+      writeConfig(config);
+      return { success: true, group: config.groups[idx] };
+    } catch (error) {
+      return { success: false, error: error.message };
+    }
+  });
+
+  ipcMain.handle('groups:delete', (event, { id }) => {
+    try {
+      const config = readConfig();
+      const idx = (config.groups || []).findIndex(g => slugify(g.name) === id);
+      if (idx === -1) return { success: false, error: `Groupe ${id} introuvable` };
+      config.groups.splice(idx, 1);
+      writeConfig(config);
+      return { success: true };
+    } catch (error) {
+      return { success: false, error: error.message };
+    }
+  });
+
   ipcMain.handle('config:export', async () => {
     const configPath = path.join(__dirname, '..', 'server', 'config', 'config.yaml');
 
diff --git a/electron/package.json b/electron/package.json
index bb84e4f..f990cb9 100644
--- a/electron/package.json
+++ b/electron/package.json
@@ -55,6 +55,7 @@
   },
   "dependencies": {
     "electron-store": "^8.1.0",
-    "qrcode": "^1.5.4"
+    "qrcode": "^1.5.4",
+    "yaml": "^2.9.0"
   }
 }
diff --git a/electron/preload.js b/electron/preload.js
index 2dd75d4..a6d2f2f 100644
--- a/electron/preload.js
+++ b/electron/preload.js
@@ -43,6 +43,14 @@ contextBridge.exposeInMainWorld('electronAPI', {
     import: () => ipcRenderer.invoke('config:import')
   },
 
+  // Groupes : lecture/écriture YAML directe (fonctionne sans serveur)
+  groups: {
+    list: () => ipcRenderer.invoke('groups:list'),
+    create: (data) => ipcRenderer.invoke('groups:create', data),
+    update: (data) => ipcRenderer.invoke('groups:update', data),
+    delete: (data) => ipcRenderer.invoke('groups:delete', data)
+  },
+
   // Helpers
   platform: process.platform,
   version: process.env.npm_package_version || '0.3.0'
diff --git a/electron/ui/app.js b/electron/ui/app.js
index 2d24cc4..009fc3f 100644
--- a/electron/ui/app.js
+++ b/electron/ui/app.js
@@ -302,17 +302,19 @@ async function fetchDevices() {
 }
 
 async function fetchGroups() {
-  const data = await apiCall('/admin/groups');
-  if (!data) return;
-
   const container = document.getElementById('groups-list');
 
+  // Lecture directe depuis config.yaml via IPC (fonctionne sans serveur)
+  const data = await window.electronAPI.groups.list();
+
   if (!data.groups || data.groups.length === 0) {
     container.innerHTML = '<p class="empty-state">Aucun groupe configuré</p>';
     return;
   }
 
-  container.innerHTML = data.groups.map(group => {
+  const serverNote = serverRunning ? '' : '<p class="config-note" style="margin-bottom:1rem">Serveur arrêté — les modifications seront appliquées au prochain démarrage.</p>';
+
+  container.innerHTML = serverNote + data.groups.map(group => {
     const id = slugify(group.name);
     return `
     <div class="group-item">
@@ -358,18 +360,27 @@ async function editGroup(id, currentName, currentBitrate) {
   }
 
   try {
-    const response = await fetch(`${API_BASE}/admin/groups/${id}`, {
-      method: 'PUT',
-      headers: { 'Content-Type': 'application/json' },
-      body: JSON.stringify({ name: newName, audioBitrate: newBitrate })
-    });
+    let ok, errorMsg;
 
-    if (response.ok) {
+    if (serverRunning) {
+      const response = await fetch(`${API_BASE}/admin/groups/${id}`, {
+        method: 'PUT',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ name: newName, audioBitrate: newBitrate })
+      });
+      ok = response.ok;
+      if (!ok) errorMsg = (await response.json().catch(() => ({}))).error;
+    } else {
+      const res = await window.electronAPI.groups.update({ id, name: newName, audioBitrate: newBitrate });
+      ok = res.success;
+      errorMsg = res.error;
+    }
+
+    if (ok) {
       showNotification('Groupe modifié', 'success');
       await fetchGroups();
     } else {
-      const err = await response.json().catch(() => ({}));
-      showNotification('Erreur: ' + (err.error || 'Modification échouée'), 'error');
+      showNotification('Erreur: ' + (errorMsg || 'Modification échouée'), 'error');
     }
   } catch (error) {
     console.error('Erreur edit group:', error);
@@ -388,16 +399,23 @@ async function deleteGroup(id, name) {
   if (!confirmed) return;
 
   try {
-    const response = await fetch(`${API_BASE}/admin/groups/${id}`, {
-      method: 'DELETE'
-    });
+    let ok, errorMsg;
 
-    if (response.ok) {
+    if (serverRunning) {
+      const response = await fetch(`${API_BASE}/admin/groups/${id}`, { method: 'DELETE' });
+      ok = response.ok;
+      if (!ok) errorMsg = (await response.json().catch(() => ({}))).error;
+    } else {
+      const res = await window.electronAPI.groups.delete({ id });
+      ok = res.success;
+      errorMsg = res.error;
+    }
+
+    if (ok) {
       showNotification('Groupe supprimé', 'success');
       await fetchGroups();
     } else {
-      const err = await response.json().catch(() => ({}));
-      showNotification('Erreur: ' + (err.error || 'Suppression échouée'), 'error');
+      showNotification('Erreur: ' + (errorMsg || 'Suppression échouée'), 'error');
     }
   } catch (error) {
     console.error('Erreur delete group:', error);
@@ -554,6 +572,12 @@ async function loadInitialData() {
 }
 
 async function loadViewData(view) {
+  // Les groupes sont lisibles même sans serveur (config.yaml direct)
+  if (view === 'groups') {
+    await fetchGroups();
+    return;
+  }
+
   if (!serverRunning) return;
 
   switch (view) {
@@ -566,9 +590,6 @@ async function loadViewData(view) {
       await fetchDevices();
       await fetchConfig();
       break;
-    case 'groups':
-      await fetchGroups();
-      break;
     case 'monitoring':
       renderVUMeters();
       break;
@@ -653,18 +674,27 @@ document.addEventListener('DOMContentLoaded', () => {
       const audioBitrate = parseInt(result.bitrate) || 96;
 
       try {
-        const response = await fetch(`${API_BASE}/admin/groups`, {
-          method: 'POST',
-          headers: { 'Content-Type': 'application/json' },
-          body: JSON.stringify({ name, audioBitrate })
-        });
+        let ok, errorMsg;
 
-        if (response.ok) {
+        if (serverRunning) {
+          const response = await fetch(`${API_BASE}/admin/groups`, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ name, audioBitrate })
+          });
+          ok = response.ok;
+          if (!ok) errorMsg = (await response.json().catch(() => ({}))).error;
+        } else {
+          const res = await window.electronAPI.groups.create({ name, audioBitrate });
+          ok = res.success;
+          errorMsg = res.error;
+        }
+
+        if (ok) {
           showNotification('Groupe créé', 'success');
           await fetchGroups();
         } else {
-          const err = await response.json().catch(() => ({}));
-          showNotification('Erreur: ' + (err.error || 'Création échouée'), 'error');
+          showNotification('Erreur: ' + (errorMsg || 'Création échouée'), 'error');
         }
       } catch (error) {
         console.error('Erreur add group:', error);