diff --git a/PdfTool/pdftoolabstractapplication.cpp b/PdfTool/pdftoolabstractapplication.cpp
index 1c73c8f..17b4c96 100644
--- a/PdfTool/pdftoolabstractapplication.cpp
+++ b/PdfTool/pdftoolabstractapplication.cpp
@@ -228,6 +228,7 @@ void PDFToolAbstractApplication::initializeCommandLineParser(QCommandLineParser*
 
     if (optionFlags.testFlag(TextSpeech))
     {
+        parser->addOption(QCommandLineOption("audio-format", "Audio fromat, valid values are wav/mp3.", "audio format", "mp3"));
         parser->addOption(QCommandLineOption("mark-page-numbers", "Mark page numbers in audio stream."));
         parser->addOption(QCommandLineOption("say-page-numbers", "Say page numbers."));
         parser->addOption(QCommandLineOption("say-struct-titles", "Say titles extracted from structure tree (only for tagged pdf)."));
@@ -388,6 +389,13 @@ PDFToolOptions PDFToolAbstractApplication::getOptions(QCommandLineParser* parser
 
     if (optionFlags.testFlag(TextSpeech))
     {
+        options.textSpeechAudioFormat = parser->value("audio-format");
+        if (options.textSpeechAudioFormat != "wav" && options.textSpeechAudioFormat != "mp3")
+        {
+            PDFConsole::writeError(PDFToolTranslationContext::tr("Unknown audio format '%1'. Defaulting to mp3 audio format.").arg(options.textSpeechAudioFormat), options.outputCodec);
+            options.textSpeechAudioFormat = "mp3";
+        }
+
         options.textSpeechMarkPageNumbers = parser->isSet("mark-page-numbers");
         options.textSpeechSayPageNumbers = parser->isSet("say-page-numbers");
         options.textSpeechSayStructTitles = parser->isSet("say-struct-titles");
diff --git a/PdfTool/pdftoolabstractapplication.h b/PdfTool/pdftoolabstractapplication.h
index f625711..5a7a0f9 100644
--- a/PdfTool/pdftoolabstractapplication.h
+++ b/PdfTool/pdftoolabstractapplication.h
@@ -106,6 +106,7 @@ struct PDFToolOptions
     bool textSpeechSayStructAlternativeDescription = false;
     bool textSpeechSayStructExpandedForm = false;
     bool textSpeechSayStructActualText = false;
+    QString textSpeechAudioFormat = "mp3";
 
     /// Returns page range. If page range is invalid, then \p errorMessage is empty.
     /// \param pageCount Page count
diff --git a/PdfTool/pdftoolaudiobook.cpp b/PdfTool/pdftoolaudiobook.cpp
index 90b7705..2e5e4e1 100644
--- a/PdfTool/pdftoolaudiobook.cpp
+++ b/PdfTool/pdftoolaudiobook.cpp
@@ -398,7 +398,7 @@ int PDFToolAudioBook::createAudioBook(const PDFToolOptions& options, pdf::PDFDoc
     }
 
     QFileInfo info(options.document);
-    QString outputFile = QString("%1/%2.wav").arg(info.path(), info.completeBaseName());
+    QString outputFile = QString("%1/%2.%3").arg(info.path(), info.completeBaseName(), options.textSpeechAudioFormat);
     BSTR outputFileName = (BSTR)outputFile.utf16();
 
     ISpeechFileStream* stream = nullptr;