diff --git a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderdetail/FolderDetailScreen.kt b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderdetail/FolderDetailScreen.kt
index e6c69c5..fc2197a 100644
--- a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderdetail/FolderDetailScreen.kt
+++ b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderdetail/FolderDetailScreen.kt
@@ -1,5 +1,8 @@
 package com.vaultdrop.mobile.ui.folderdetail
 
+import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
@@ -12,7 +15,9 @@ import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.items
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.Close
 import androidx.compose.material.icons.filled.Folder
+import androidx.compose.material.icons.filled.MergeType
 import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
@@ -39,7 +44,10 @@ import com.vaultdrop.mobile.data.local.entity.FileEntity
 import com.vaultdrop.mobile.data.local.entity.FolderEntity
 import com.vaultdrop.mobile.features.connection.ConnectionStatusViewModel
 import com.vaultdrop.mobile.ui.components.FileCategoryIcon
+import com.vaultdrop.mobile.ui.components.SelectionState
+import com.vaultdrop.mobile.ui.components.SelectionStatusIcon
 import com.vaultdrop.mobile.ui.components.ServerStatusBadge
+import com.vaultdrop.mobile.ui.components.rememberSelectionState
 import java.util.Locale
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -49,35 +57,70 @@ fun FolderDetailScreen(
     onBack: () -> Unit,
     onOpenFolder: (String) -> Unit,
     onOpenDocument: (String) -> Unit,
+    onBuildPdf: (List<String>) -> Unit,
     connectionStatusViewModel: ConnectionStatusViewModel,
     viewModel: FolderDetailViewModel = hiltViewModel(),
 ) {
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
     val connectionStatus by connectionStatusViewModel.status.collectAsStateWithLifecycle()
+    val selection = rememberSelectionState()
 
     LaunchedEffect(uiState.folderMissing) {
         if (uiState.folderMissing) onBack()
     }
 
+    BackHandler(enabled = selection.active) { selection.clear() }
+
     Scaffold(
         topBar = {
             TopAppBar(
-                title = { Text(uiState.folder?.name ?: stringResource(R.string.folder)) },
+                title = {
+                    if (selection.active) {
+                        Text(stringResource(R.string.selection_count, selection.ids.size))
+                    } else {
+                        Text(uiState.folder?.name ?: stringResource(R.string.folder))
+                    }
+                },
                 navigationIcon = {
-                    IconButton(onClick = onBack) {
-                        Icon(
-                            Icons.AutoMirrored.Filled.ArrowBack,
-                            contentDescription = stringResource(R.string.back),
-                        )
+                    if (selection.active) {
+                        IconButton(onClick = { selection.clear() }) {
+                            Icon(
+                                Icons.Filled.Close,
+                                contentDescription = stringResource(R.string.selection_cancel),
+                            )
+                        }
+                    } else {
+                        IconButton(onClick = onBack) {
+                            Icon(
+                                Icons.AutoMirrored.Filled.ArrowBack,
+                                contentDescription = stringResource(R.string.back),
+                            )
+                        }
                     }
                 },
                 actions = {
-                    ServerStatusBadge(
-                        status = connectionStatus,
-                        onClick = connectionStatusViewModel::checkNow,
-                    )
-                    IconButton(onClick = viewModel::refresh) {
-                        Icon(Icons.Filled.Refresh, contentDescription = stringResource(R.string.refresh))
+                    if (selection.active) {
+                        IconButton(
+                            onClick = {
+                                val ids = selection.ids.toList()
+                                selection.clear()
+                                onBuildPdf(ids)
+                            },
+                            enabled = selection.ids.isNotEmpty(),
+                        ) {
+                            Icon(
+                                Icons.Filled.MergeType,
+                                contentDescription = stringResource(R.string.selection_assemble),
+                            )
+                        }
+                    } else {
+                        ServerStatusBadge(
+                            status = connectionStatus,
+                            onClick = connectionStatusViewModel::checkNow,
+                        )
+                        IconButton(onClick = viewModel::refresh) {
+                            Icon(Icons.Filled.Refresh, contentDescription = stringResource(R.string.refresh))
+                        }
                     }
                 },
             )
@@ -88,6 +131,7 @@ fun FolderDetailScreen(
             files = uiState.files,
             isRefreshing = uiState.isRefreshing,
             error = uiState.error,
+            selection = selection,
             onOpenFolder = onOpenFolder,
             onOpenDocument = onOpenDocument,
             modifier = Modifier.padding(padding),
@@ -101,6 +145,7 @@ private fun FolderDetailContent(
     files: List<FileEntity>,
     isRefreshing: Boolean,
     error: String?,
+    selection: SelectionState,
     onOpenFolder: (String) -> Unit,
     onOpenDocument: (String) -> Unit,
     modifier: Modifier = Modifier,
@@ -116,7 +161,11 @@ private fun FolderDetailContent(
             FolderRow(folder, onClick = { onOpenFolder(folder.resourceId) })
         }
         items(files, key = { it.resourceId }) { file ->
-            FileRow(file, onClick = { onOpenDocument(file.resourceId) })
+            FileRow(
+                file = file,
+                selection = selection,
+                onOpenDocument = { onOpenDocument(file.resourceId) },
+            )
         }
         when {
             empty -> {
@@ -186,12 +235,27 @@ private fun FolderRow(folder: FolderEntity, onClick: () -> Unit) {
     }
 }
 
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
-private fun FileRow(file: FileEntity, onClick: () -> Unit) {
+private fun FileRow(
+    file: FileEntity,
+    selection: SelectionState,
+    onOpenDocument: () -> Unit,
+) {
+    val selected = file.resourceId in selection.ids
     Card(
-        onClick = onClick,
         colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surface),
         elevation = CardDefaults.cardElevation(defaultElevation = 1.dp),
+        modifier = Modifier
+            .fillMaxWidth()
+            .combinedClickable(
+                onClick = {
+                    if (selection.active) selection.toggle(file.resourceId) else onOpenDocument()
+                },
+                onLongClick = {
+                    if (!selection.active) selection.start(file.resourceId)
+                },
+            ),
     ) {
         Row(
             modifier = Modifier
@@ -213,6 +277,9 @@ private fun FileRow(file: FileEntity, onClick: () -> Unit) {
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
             }
+            if (selection.active) {
+                SelectionStatusIcon(selected = selected)
+            }
         }
     }
 }
diff --git a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderlist/FolderListScreen.kt b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderlist/FolderListScreen.kt
index c1f71d8..7557038 100644
--- a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderlist/FolderListScreen.kt
+++ b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/folderlist/FolderListScreen.kt
@@ -5,9 +5,12 @@ import android.content.Intent
 import android.net.Uri
 import android.provider.DocumentsContract
 import android.provider.OpenableColumns
+import androidx.activity.compose.BackHandler
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.PaddingValues
@@ -23,6 +26,8 @@ import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Add
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.MergeType
 import androidx.compose.material.icons.filled.Refresh
 import androidx.compose.material3.Button
 import androidx.compose.material3.Card
@@ -52,7 +57,10 @@ import com.vaultdrop.mobile.data.local.entity.FileEntity
 import com.vaultdrop.mobile.features.connection.ConnectionStatusViewModel
 import com.vaultdrop.mobile.features.sync.SyncViewModel
 import com.vaultdrop.mobile.ui.components.FileCategoryIcon
+import com.vaultdrop.mobile.ui.components.SelectionState
+import com.vaultdrop.mobile.ui.components.SelectionStatusIcon
 import com.vaultdrop.mobile.ui.components.ServerStatusBadge
+import com.vaultdrop.mobile.ui.components.rememberSelectionState
 import com.vaultdrop.mobile.ui.navigation.FloatingNavBar
 import com.vaultdrop.mobile.ui.navigation.NavTab
 import java.util.Locale
@@ -63,6 +71,7 @@ fun FolderListScreen(
     selectedTab: NavTab,
     onTabSelected: (NavTab) -> Unit,
     onOpenDocument: (String) -> Unit,
+    onBuildPdf: (List<String>) -> Unit,
     syncViewModel: SyncViewModel,
     connectionStatusViewModel: ConnectionStatusViewModel,
     viewModel: FolderListViewModel = hiltViewModel(),
@@ -72,6 +81,7 @@ fun FolderListScreen(
     val connectionStatus by connectionStatusViewModel.status.collectAsStateWithLifecycle()
     val context = LocalContext.current
     val folderLabel = stringResource(R.string.folder)
+    val selection = rememberSelectionState()
 
     val pickFolderLauncher = rememberLauncherForActivityResult(
         ActivityResultContracts.OpenDocumentTree(),
@@ -90,17 +100,51 @@ fun FolderListScreen(
         )
     }
 
+    BackHandler(enabled = selection.active) { selection.clear() }
+
     Scaffold(
         topBar = {
             TopAppBar(
-                title = { Text(stringResource(R.string.files)) },
+                title = {
+                    if (selection.active) {
+                        Text(stringResource(R.string.selection_count, selection.ids.size))
+                    } else {
+                        Text(stringResource(R.string.files))
+                    }
+                },
+                navigationIcon = {
+                    if (selection.active) {
+                        IconButton(onClick = { selection.clear() }) {
+                            Icon(
+                                Icons.Filled.Close,
+                                contentDescription = stringResource(R.string.selection_cancel),
+                            )
+                        }
+                    }
+                },
                 actions = {
-                    ServerStatusBadge(
-                        status = connectionStatus,
-                        onClick = connectionStatusViewModel::checkNow,
-                    )
-                    IconButton(onClick = viewModel::refresh) {
-                        Icon(Icons.Filled.Refresh, contentDescription = stringResource(R.string.refresh))
+                    if (selection.active) {
+                        IconButton(
+                            onClick = {
+                                val ids = selection.ids.toList()
+                                selection.clear()
+                                onBuildPdf(ids)
+                            },
+                            enabled = selection.ids.isNotEmpty(),
+                        ) {
+                            Icon(
+                                Icons.Filled.MergeType,
+                                contentDescription = stringResource(R.string.selection_assemble),
+                            )
+                        }
+                    } else {
+                        ServerStatusBadge(
+                            status = connectionStatus,
+                            onClick = connectionStatusViewModel::checkNow,
+                        )
+                        IconButton(onClick = viewModel::refresh) {
+                            Icon(Icons.Filled.Refresh, contentDescription = stringResource(R.string.refresh))
+                        }
                     }
                 },
             )
@@ -113,6 +157,7 @@ fun FolderListScreen(
             uiState = uiState,
             isImporting = importState.isImporting,
             error = uiState.error ?: importState.error,
+            selection = selection,
             onAddFolder = { pickFolderLauncher.launch(null) },
             onOpenDocument = onOpenDocument,
             modifier = Modifier.padding(padding),
@@ -140,6 +185,7 @@ private fun FolderListContent(
     uiState: FolderListUiState,
     isImporting: Boolean,
     error: String?,
+    selection: SelectionState,
     onAddFolder: () -> Unit,
     onOpenDocument: (String) -> Unit,
     modifier: Modifier = Modifier,
@@ -212,12 +258,14 @@ private fun FolderListContent(
                 ) {
                     FileCard(
                         file = row.left,
+                        selection = selection,
                         onClick = { onOpenDocument(row.left.resourceId) },
                         modifier = Modifier.weight(1f),
                     )
                     if (row.right != null) {
                         FileCard(
                             file = row.right,
+                            selection = selection,
                             onClick = { onOpenDocument(row.right.resourceId) },
                             modifier = Modifier.weight(1f),
                         )
@@ -241,19 +289,38 @@ private fun SectionHeader(label: String) {
     )
 }
 
-/** Carte fichier — le clic ouvre la consultation du document. */
+/** Carte fichier — clic long pour la sélection multi-fichiers, clic pour ouvrir. */
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
-private fun FileCard(file: FileEntity, onClick: () -> Unit, modifier: Modifier = Modifier) {
+private fun FileCard(
+    file: FileEntity,
+    selection: SelectionState,
+    onClick: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val selected = file.resourceId in selection.ids
     Card(
-        onClick = onClick,
         colors = CardDefaults.cardColors(containerColor = Color(0xFFF7F8FA)),
         elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
         border = BorderStroke(1.dp, Color(0xFFEAEAEA)),
         shape = RoundedCornerShape(10.dp),
-        modifier = modifier,
+        modifier = modifier.combinedClickable(
+            onClick = {
+                if (selection.active) selection.toggle(file.resourceId) else onClick()
+            },
+            onLongClick = {
+                if (!selection.active) selection.start(file.resourceId)
+            },
+        ),
     ) {
         Column(modifier = Modifier.padding(12.dp)) {
-            FileCategoryIcon(file = file, size = 36.dp)
+            Row(verticalAlignment = androidx.compose.ui.Alignment.CenterVertically) {
+                FileCategoryIcon(file = file, size = 36.dp)
+                if (selection.active) {
+                    Spacer(Modifier.weight(1f))
+                    SelectionStatusIcon(selected = selected)
+                }
+            }
             Spacer(Modifier.height(8.dp))
             Text(
                 text = file.name,
diff --git a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/navigation/NavGraph.kt b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/navigation/NavGraph.kt
index eb7625d..ae16b0b 100644
--- a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/navigation/NavGraph.kt
+++ b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/navigation/NavGraph.kt
@@ -21,6 +21,7 @@ import com.vaultdrop.mobile.ui.auth.AuthViewModel
 import com.vaultdrop.mobile.ui.document.DocumentViewerScreen
 import com.vaultdrop.mobile.ui.folderdetail.FolderDetailScreen
 import com.vaultdrop.mobile.ui.folderlist.FolderListScreen
+import com.vaultdrop.mobile.ui.pdfbuilder.PdfBuilderScreen
 import com.vaultdrop.mobile.ui.search.SearchScreen
 import com.vaultdrop.mobile.ui.settings.SettingsScreen
 
@@ -32,9 +33,12 @@ object Routes {
     const val ARG_FOLDER = "folderResourceId"
     const val DOCUMENT = "document/{documentResourceId}"
     const val ARG_DOCUMENT = "documentResourceId"
+    const val PDF_BUILDER = "pdfbuilder/{ids}"
+    const val ARG_BUILDER_IDS = "ids"
 
     fun folder(folderResourceId: String): String = "folder/$folderResourceId"
     fun document(documentResourceId: String): String = "document/$documentResourceId"
+    fun pdfBuilder(resourceIds: List<String>): String = "pdfbuilder/${resourceIds.joinToString(",")}"
 }
 
 private fun String?.toNavTab(): NavTab = when (this) {
@@ -76,6 +80,7 @@ fun NavGraph(
                     selectedTab = selectedTab,
                     onTabSelected = onTabSelected,
                     onOpenDocument = { id -> navController.navigate(Routes.document(id)) },
+                    onBuildPdf = { ids -> navController.navigate(Routes.pdfBuilder(ids)) },
                     syncViewModel = syncViewModel,
                     connectionStatusViewModel = connectionStatusViewModel,
                 )
@@ -85,6 +90,7 @@ fun NavGraph(
                     selectedTab = selectedTab,
                     onTabSelected = onTabSelected,
                     onOpenDocument = { id -> navController.navigate(Routes.document(id)) },
+                    onBuildPdf = { ids -> navController.navigate(Routes.pdfBuilder(ids)) },
                     connectionStatusViewModel = connectionStatusViewModel,
                 )
             }
@@ -110,6 +116,7 @@ fun NavGraph(
                     onBack = { navController.popBackStack() },
                     onOpenFolder = { id -> navController.navigate(Routes.folder(id)) },
                     onOpenDocument = { id -> navController.navigate(Routes.document(id)) },
+                    onBuildPdf = { ids -> navController.navigate(Routes.pdfBuilder(ids)) },
                     connectionStatusViewModel = connectionStatusViewModel,
                 )
             }
@@ -128,6 +135,22 @@ fun NavGraph(
                     connectionStatusViewModel = connectionStatusViewModel,
                 )
             }
+            composable(
+                route = Routes.PDF_BUILDER,
+                arguments = listOf(
+                    navArgument(Routes.ARG_BUILDER_IDS) { type = NavType.StringType },
+                ),
+            ) { backStackEntry ->
+                val ids = backStackEntry.arguments
+                    ?.getString(Routes.ARG_BUILDER_IDS)
+                    .orEmpty()
+                    .split(",")
+                    .filter { it.isNotBlank() }
+                PdfBuilderScreen(
+                    initialResourceIds = ids,
+                    onBack = { navController.popBackStack() },
+                )
+            }
         }
 
         // Bandeau global : visible sur tous les onglets tant qu'un import SAF
diff --git a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/search/SearchScreen.kt b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/search/SearchScreen.kt
index 28f746c..4c9bdd8 100644
--- a/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/search/SearchScreen.kt
+++ b/mobile-kotlin/app/src/main/java/com/vaultdrop/mobile/ui/search/SearchScreen.kt
@@ -1,6 +1,9 @@
 package com.vaultdrop.mobile.ui.search
 
+import androidx.activity.compose.BackHandler
 import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
@@ -17,6 +20,8 @@ import androidx.compose.foundation.lazy.LazyRow
 import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.MergeType
 import androidx.compose.material.icons.filled.Search
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
@@ -24,6 +29,7 @@ import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.FilterChip
 import androidx.compose.material3.FilterChipDefaults
 import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Scaffold
@@ -46,9 +52,12 @@ import com.vaultdrop.mobile.data.local.entity.FileEntity
 import com.vaultdrop.mobile.domain.FileCategory
 import com.vaultdrop.mobile.features.connection.ConnectionStatusViewModel
 import com.vaultdrop.mobile.ui.components.FileCategoryIcon
+import com.vaultdrop.mobile.ui.components.SelectionState
+import com.vaultdrop.mobile.ui.components.SelectionStatusIcon
 import com.vaultdrop.mobile.ui.components.ServerStatusBadge
 import com.vaultdrop.mobile.ui.components.color
 import com.vaultdrop.mobile.ui.components.icon
+import com.vaultdrop.mobile.ui.components.rememberSelectionState
 import com.vaultdrop.mobile.ui.navigation.FloatingNavBar
 import com.vaultdrop.mobile.ui.navigation.NavTab
 import java.util.Locale
@@ -59,21 +68,57 @@ fun SearchScreen(
     selectedTab: NavTab,
     onTabSelected: (NavTab) -> Unit,
     onOpenDocument: (String) -> Unit,
+    onBuildPdf: (List<String>) -> Unit,
     connectionStatusViewModel: ConnectionStatusViewModel,
     viewModel: SearchViewModel = hiltViewModel(),
 ) {
     val uiState by viewModel.uiState.collectAsStateWithLifecycle()
     val connectionStatus by connectionStatusViewModel.status.collectAsStateWithLifecycle()
+    val selection = rememberSelectionState()
+
+    BackHandler(enabled = selection.active) { selection.clear() }
 
     Scaffold(
         topBar = {
             TopAppBar(
-                title = { Text(stringResource(R.string.search)) },
+                title = {
+                    if (selection.active) {
+                        Text(stringResource(R.string.selection_count, selection.ids.size))
+                    } else {
+                        Text(stringResource(R.string.search))
+                    }
+                },
+                navigationIcon = {
+                    if (selection.active) {
+                        IconButton(onClick = { selection.clear() }) {
+                            Icon(
+                                Icons.Filled.Close,
+                                contentDescription = stringResource(R.string.selection_cancel),
+                            )
+                        }
+                    }
+                },
                 actions = {
-                    ServerStatusBadge(
-                        status = connectionStatus,
-                        onClick = connectionStatusViewModel::checkNow,
-                    )
+                    if (selection.active) {
+                        IconButton(
+                            onClick = {
+                                val ids = selection.ids.toList()
+                                selection.clear()
+                                onBuildPdf(ids)
+                            },
+                            enabled = selection.ids.isNotEmpty(),
+                        ) {
+                            Icon(
+                                Icons.Filled.MergeType,
+                                contentDescription = stringResource(R.string.selection_assemble),
+                            )
+                        }
+                    } else {
+                        ServerStatusBadge(
+                            status = connectionStatus,
+                            onClick = connectionStatusViewModel::checkNow,
+                        )
+                    }
                 },
             )
         },
@@ -83,6 +128,7 @@ fun SearchScreen(
     ) { padding ->
         SearchContent(
             uiState = uiState,
+            selection = selection,
             onQueryChange = viewModel::onQueryChange,
             onCategorySelect = viewModel::onCategorySelect,
             onOpenDocument = onOpenDocument,
@@ -94,6 +140,7 @@ fun SearchScreen(
 @Composable
 private fun SearchContent(
     uiState: SearchUiState,
+    selection: SelectionState,
     onQueryChange: (String) -> Unit,
     onCategorySelect: (String?) -> Unit,
     onOpenDocument: (String) -> Unit,
@@ -113,6 +160,7 @@ private fun SearchContent(
             leadingIcon = { Icon(Icons.Filled.Search, contentDescription = null) },
             placeholder = { Text(stringResource(R.string.search_hint)) },
             singleLine = true,
+            enabled = !selection.active,
         )
 
         LazyRow(
@@ -138,6 +186,7 @@ private fun SearchContent(
 
         SearchResults(
             uiState = uiState,
+            selection = selection,
             onOpenDocument = onOpenDocument,
             modifier = Modifier.weight(1f),
         )
@@ -185,6 +234,7 @@ private fun categoryLabel(category: FileCategory): String = when (category) {
 @Composable
 private fun SearchResults(
     uiState: SearchUiState,
+    selection: SelectionState,
     onOpenDocument: (String) -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -231,21 +281,40 @@ private fun SearchResults(
                 }
             }
             items(uiState.results, key = { it.resourceId }) { file ->
-                SearchResultCard(file = file, onClick = { onOpenDocument(file.resourceId) })
+                SearchResultCard(
+                    file = file,
+                    selection = selection,
+                    onOpenDocument = { onOpenDocument(file.resourceId) },
+                )
             }
         }
     }
 }
 
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
-private fun SearchResultCard(file: FileEntity, onClick: () -> Unit, modifier: Modifier = Modifier) {
+private fun SearchResultCard(
+    file: FileEntity,
+    selection: SelectionState,
+    onOpenDocument: () -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val selected = file.resourceId in selection.ids
     Card(
-        onClick = onClick,
         colors = CardDefaults.cardColors(containerColor = Color(0xFFF7F8FA)),
         elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
         border = BorderStroke(1.dp, Color(0xFFEAEAEA)),
         shape = RoundedCornerShape(10.dp),
-        modifier = modifier.fillMaxWidth(),
+        modifier = modifier
+            .fillMaxWidth()
+            .combinedClickable(
+                onClick = {
+                    if (selection.active) selection.toggle(file.resourceId) else onOpenDocument()
+                },
+                onLongClick = {
+                    if (!selection.active) selection.start(file.resourceId)
+                },
+            ),
     ) {
         Row(
             modifier = Modifier.padding(12.dp),
@@ -269,11 +338,15 @@ private fun SearchResultCard(file: FileEntity, onClick: () -> Unit, modifier: Mo
                 )
             }
             Spacer(Modifier.width(12.dp))
-            Text(
-                text = formatSize(file.size),
-                style = MaterialTheme.typography.labelMedium,
-                color = MaterialTheme.colorScheme.onSurfaceVariant,
-            )
+            if (selection.active) {
+                SelectionStatusIcon(selected = selected)
+            } else {
+                Text(
+                    text = formatSize(file.size),
+                    style = MaterialTheme.typography.labelMedium,
+                    color = MaterialTheme.colorScheme.onSurfaceVariant,
+                )
+            }
         }
     }
 }
diff --git a/mobile-kotlin/app/src/main/res/values-en/strings.xml b/mobile-kotlin/app/src/main/res/values-en/strings.xml
index 83c7334..429184b 100644
--- a/mobile-kotlin/app/src/main/res/values-en/strings.xml
+++ b/mobile-kotlin/app/src/main/res/values-en/strings.xml
@@ -74,4 +74,28 @@
     <string name="login_error_unauthorized">Incorrect username or password</string>
     <string name="login_skip">Continue without account</string>
     <string name="skip_message">Local mode — your folders stay on this device and are not synced.</string>
+
+    <!-- Multi-select + PDF assembly -->
+    <string name="selection_count">%1$d selected</string>
+    <string name="selection_assemble">Assemble PDF</string>
+    <string name="selection_cancel">Cancel selection</string>
+    <string name="pdf_builder_title">Assemble a PDF</string>
+    <string name="pdf_builder_empty">Nothing here yet. Add files or a note to start assembling.</string>
+    <string name="pdf_builder_add_files">Add a file</string>
+    <string name="pdf_builder_pick_files">Pick files</string>
+    <string name="pdf_builder_add_note">Add a note</string>
+    <string name="pdf_builder_note">Text note</string>
+    <string name="pdf_builder_note_hint">Type your note text…</string>
+    <string name="pdf_builder_add">Add</string>
+    <string name="pdf_builder_cancel">Cancel</string>
+    <string name="pdf_builder_assemble">Assemble PDF</string>
+    <string name="pdf_builder_remove">Remove</string>
+    <string name="pdf_builder_move_up">Move up</string>
+    <string name="pdf_builder_move_down">Move down</string>
+    <string name="pdf_builder_unreadable">Unreadable — skipped</string>
+    <string name="pdf_builder_no_items">Select at least one file or add a note.</string>
+    <string name="pdf_builder_error">Could not generate the PDF.</string>
+    <string name="pdf_builder_save_error">Could not save the PDF.</string>
+    <string name="pdf_builder_saved">PDF created</string>
+    <string name="pdf_generated_folder">Generated PDFs</string>
 </resources>
\ No newline at end of file
diff --git a/mobile-kotlin/app/src/main/res/values/strings.xml b/mobile-kotlin/app/src/main/res/values/strings.xml
index 4a0bb7b..55be93b 100644
--- a/mobile-kotlin/app/src/main/res/values/strings.xml
+++ b/mobile-kotlin/app/src/main/res/values/strings.xml
@@ -82,4 +82,28 @@
     <string name="status_checking">Vérification…</string>
     <string name="status_local">Mode local</string>
     <string name="status_tap_to_recheck">Statut serveur — appuyer pour vérifier</string>
+
+    <!-- Sélection multi-fichiers + assemblage PDF -->
+    <string name="selection_count">%1$d sélectionné(s)</string>
+    <string name="selection_assemble">Assembler en PDF</string>
+    <string name="selection_cancel">Annuler la sélection</string>
+    <string name="pdf_builder_title">Assembler un PDF</string>
+    <string name="pdf_builder_empty">Aucun élément. Ajoute des fichiers ou une note pour commencer l\'assemblage.</string>
+    <string name="pdf_builder_add_files">Ajouter un fichier</string>
+    <string name="pdf_builder_pick_files">Choisir des fichiers</string>
+    <string name="pdf_builder_add_note">Ajouter une note</string>
+    <string name="pdf_builder_note">Note texte</string>
+    <string name="pdf_builder_note_hint">Saisis le texte de la note…</string>
+    <string name="pdf_builder_add">Ajouter</string>
+    <string name="pdf_builder_cancel">Annuler</string>
+    <string name="pdf_builder_assemble">Assembler le PDF</string>
+    <string name="pdf_builder_remove">Retirer</string>
+    <string name="pdf_builder_move_up">Monter</string>
+    <string name="pdf_builder_move_down">Descendre</string>
+    <string name="pdf_builder_unreadable">Illisible — ignoré</string>
+    <string name="pdf_builder_no_items">Sélectionne au moins un fichier ou ajoute une note.</string>
+    <string name="pdf_builder_error">Impossible de générer le PDF.</string>
+    <string name="pdf_builder_save_error">Impossible d\'enregistrer le PDF.</string>
+    <string name="pdf_builder_saved">PDF créé</string>
+    <string name="pdf_generated_folder">PDF générés</string>
 </resources>
\ No newline at end of file