diff --git a/src/main/resources/messages_de_DE.properties b/src/main/resources/messages_de_DE.properties
index 7837b6b9..a902dce7 100644
--- a/src/main/resources/messages_de_DE.properties
+++ b/src/main/resources/messages_de_DE.properties
@@ -941,6 +941,7 @@ pdfToPDFA.header=PDF zu PDF/A
 pdfToPDFA.credit=Dieser Dienst verwendet OCRmyPDF für die PDF/A-Konvertierung
 pdfToPDFA.submit=Konvertieren
 pdfToPDFA.tip=Dieser Dienst kann nur einzelne Eingangsdateien verarbeiten.
+pdfToPDFA.outputFormat=Ausgabeformat
 
 
 #PDFToWord
diff --git a/src/main/resources/messages_en_GB.properties b/src/main/resources/messages_en_GB.properties
index 30bcb9fd..08631ec0 100644
--- a/src/main/resources/messages_en_GB.properties
+++ b/src/main/resources/messages_en_GB.properties
@@ -941,6 +941,7 @@ pdfToPDFA.header=PDF To PDF/A
 pdfToPDFA.credit=This service uses OCRmyPDF for PDF/A conversion
 pdfToPDFA.submit=Convert
 pdfToPDFA.tip=Currently does not work for multiple inputs at once
+pdfToPDFA.outputFormat=Output format
 
 
 #PDFToWord
diff --git a/src/main/resources/messages_en_US.properties b/src/main/resources/messages_en_US.properties
index 3f0c7afb..ab06056a 100644
--- a/src/main/resources/messages_en_US.properties
+++ b/src/main/resources/messages_en_US.properties
@@ -941,6 +941,7 @@ pdfToPDFA.header=PDF To PDF/A
 pdfToPDFA.credit=This service uses OCRmyPDF for PDF/A conversion
 pdfToPDFA.submit=Convert
 pdfToPDFA.tip=Currently does not work for multiple inputs at once
+pdfToPDFA.outputFormat=Output format
 
 
 #PDFToWord