diff --git a/src/locales/ar.json b/src/locales/ar.json
index 7deb0d32..bf1a8b09 100644
--- a/src/locales/ar.json
+++ b/src/locales/ar.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "المستلمين",
   "msgPluginSender": "المرسل",
   "pdfPluginLoading": "تحميل ...",
-  "pdfPluginPageNumber": " {{ allPagesCount }} \\ {{ currentPage }} صفحة "
+  "pdfPluginPageNumber": " {{ allPagesCount }} \\ {{ currentPage }} صفحة ",
+  "pdfZoomInLabel": "تكبير",
+  "pdfZoomOutLabel": "تصغير",
+  "pdfZoomResetLabel": "إعادة الضبط على مستوى التكبير أو التصغير التلقائي"
 }
diff --git a/src/locales/de.json b/src/locales/de.json
index a8ca5fc1..edbd21ac 100644
--- a/src/locales/de.json
+++ b/src/locales/de.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Empfänger",
   "msgPluginSender": "Absender",
   "pdfPluginLoading": "Wird geladen...",
-  "pdfPluginPageNumber": "Seite {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Seite {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Vergrößern",
+  "pdfZoomOutLabel": "Verkleinern",
+  "pdfZoomResetLabel": "Auf Standard-Zoomstufe zurücksetzen"
 }
diff --git a/src/locales/en.json b/src/locales/en.json
index 6bda77d9..e15cc1a5 100644
--- a/src/locales/en.json
+++ b/src/locales/en.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Recipients",
   "msgPluginSender": "Sender",
   "pdfPluginLoading": "Loading...",
-  "pdfPluginPageNumber": "Page {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Page {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Zoom in",
+  "pdfZoomOutLabel": "Zoom out",
+  "pdfZoomResetLabel": "Reset to default zoom level"
 }
diff --git a/src/locales/es.json b/src/locales/es.json
index 5f82f2fb..c9496ab8 100644
--- a/src/locales/es.json
+++ b/src/locales/es.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Destinatarios",
   "msgPluginSender": "Remitente",
   "pdfPluginLoading": "Cargando...",
-  "pdfPluginPageNumber": "Página {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Página {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Acercar",
+  "pdfZoomOutLabel": "Alejar",
+  "pdfZoomResetLabel": "Restablecer el nivel de zoom predeterminado"
 }
diff --git a/src/locales/fr.json b/src/locales/fr.json
index e80bbea5..a85e6212 100644
--- a/src/locales/fr.json
+++ b/src/locales/fr.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Destinataires",
   "msgPluginSender": "Expéditeur",
   "pdfPluginLoading": "Chargement...",
-  "pdfPluginPageNumber": "Page {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Page {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Zoom avant",
+  "pdfZoomOutLabel": "Zoom arrière",
+  "pdfZoomResetLabel": "Réinitialiser le niveau de zoom par défaut"
 }
diff --git a/src/locales/it.json b/src/locales/it.json
index bc4a1e37..10e66710 100644
--- a/src/locales/it.json
+++ b/src/locales/it.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Destinatari",
   "msgPluginSender": "Mittente",
   "pdfPluginLoading": "Caricamento in corso...",
-  "pdfPluginPageNumber": "Pagina {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Pagina {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Ingrandisci",
+  "pdfZoomOutLabel": "Riduci",
+  "pdfZoomResetLabel": "Ripristina il livello di zoom predefinito"
 }
diff --git a/src/locales/ja.json b/src/locales/ja.json
index 3129341c..792dd495 100644
--- a/src/locales/ja.json
+++ b/src/locales/ja.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "受信者",
   "msgPluginSender": "送信者",
   "pdfPluginLoading": "ローティング中...",
-  "pdfPluginPageNumber": "ページ {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "ページ {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "拡大",
+  "pdfZoomOutLabel": "縮小",
+  "pdfZoomResetLabel": "リセットしてデフォルトのズームレベルに戻す"
 }
diff --git a/src/locales/pl.json b/src/locales/pl.json
index 442287ad..5861b256 100644
--- a/src/locales/pl.json
+++ b/src/locales/pl.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Odbiorcy",
   "msgPluginSender": "Nadawca",
   "pdfPluginLoading": "Wczytywanie...",
-  "pdfPluginPageNumber": "Strona {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Strona {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Powiększ",
+  "pdfZoomOutLabel": "Pomniejsz",
+  "pdfZoomResetLabel": "Przywróć domyślny poziom powiększeni"
 }
diff --git a/src/locales/pt.json b/src/locales/pt.json
index 03b9388c..6ea6ef74 100644
--- a/src/locales/pt.json
+++ b/src/locales/pt.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Destinatários",
   "msgPluginSender": "Remetente",
   "pdfPluginLoading": "Carregando...",
-  "pdfPluginPageNumber": "Página {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Página {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Ampliar",
+  "pdfZoomOutLabel": "Reduzir",
+  "pdfZoomResetLabel": "Repor o nível de zoom predefinido"
 }
diff --git a/src/locales/ru.json b/src/locales/ru.json
index e4ca6055..27a9d140 100644
--- a/src/locales/ru.json
+++ b/src/locales/ru.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Получатели",
   "msgPluginSender": "Отправитель",
   "pdfPluginLoading": "Загрузка...",
-  "pdfPluginPageNumber": "Страница {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Страница {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Увеличить",
+  "pdfZoomOutLabel": "Уменьшить",
+  "pdfZoomResetLabel": "Восстановить масштаб по умолчанию"
 }
diff --git a/src/locales/se.json b/src/locales/se.json
index aa8e6aa9..081a433b 100644
--- a/src/locales/se.json
+++ b/src/locales/se.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Mottagare",
   "msgPluginSender": "Avsändare",
   "pdfPluginLoading": "Laddar...",
-  "pdfPluginPageNumber": "Sida {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Sida {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Zooma in",
+  "pdfZoomOutLabel": "Zooma out",
+  "pdfZoomResetLabel": "Återställ standardzoomnivån"
 }
diff --git a/src/locales/sr.json b/src/locales/sr.json
index ad7d05ae..d57c26d2 100644
--- a/src/locales/sr.json
+++ b/src/locales/sr.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Primaoci",
   "msgPluginSender": "Pošiljalac",
   "pdfPluginLoading": "Učitavanje...",
-  "pdfPluginPageNumber": "Strana {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Strana {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Povećaj",
+  "pdfZoomOutLabel": "Smanji",
+  "pdfZoomResetLabel": "Vraćanje na zadanu razinu zumiranja"
 }
diff --git a/src/locales/sr_cyr.json b/src/locales/sr_cyr.json
index d0f0e7ef..f43db9ab 100644
--- a/src/locales/sr_cyr.json
+++ b/src/locales/sr_cyr.json
@@ -6,5 +6,8 @@
   "msgPluginRecipients": "Примаоци",
   "msgPluginSender": "Пошиљалац",
   "pdfPluginLoading": "Учитавање...",
-  "pdfPluginPageNumber": "Страна {{ currentPage }}/{{ allPagesCount }}"
+  "pdfPluginPageNumber": "Страна {{ currentPage }}/{{ allPagesCount }}",
+  "pdfZoomInLabel": "Увећај",
+  "pdfZoomOutLabel": "Умањи",
+  "pdfZoomResetLabel": "Ресетуј на подразумевани ниво зумирања"
 }
diff --git a/src/renderers/pdf/components/PDFControls.tsx b/src/renderers/pdf/components/PDFControls.tsx
index 4a86c345..7ca71894 100644
--- a/src/renderers/pdf/components/PDFControls.tsx
+++ b/src/renderers/pdf/components/PDFControls.tsx
@@ -47,6 +47,7 @@ const PDFControls: FC = () => {
 
       <ControlButton
         id="pdf-zoom-out"
+        title={t("pdfZoomOutLabel")}
         onMouseDown={() => dispatch(setZoomLevel(zoomLevel - zoomJump))}
       >
         <ZoomOutPDFIcon color="#000" size="80%" />
@@ -54,6 +55,7 @@ const PDFControls: FC = () => {
 
       <ControlButton
         id="pdf-zoom-in"
+        title={t("pdfZoomInLabel")}
         onMouseDown={() => dispatch(setZoomLevel(zoomLevel + zoomJump))}
       >
         <ZoomInPDFIcon color="#000" size="80%" />
@@ -61,6 +63,7 @@ const PDFControls: FC = () => {
 
       <ControlButton
         id="pdf-zoom-reset"
+        title={t("pdfZoomResetLabel")}
         onMouseDown={() => dispatch(setZoomLevel(defaultZoomLevel))}
         disabled={zoomLevel === defaultZoomLevel}
       >