diff --git a/PdfTool/pdftoolabstractapplication.cpp b/PdfTool/pdftoolabstractapplication.cpp
index d43abde..dfbb4da 100644
--- a/PdfTool/pdftoolabstractapplication.cpp
+++ b/PdfTool/pdftoolabstractapplication.cpp
@@ -317,6 +317,11 @@ void PDFToolAbstractApplication::initializeCommandLineParser(QCommandLineParser*
         parser->addOption(QCommandLineOption("list-user-certs", "Show list of user certificates.", "bool", "1"));
         parser->addOption(QCommandLineOption("list-system-certs", "Show list of system certificates.", "bool", "0"));
     }
+
+    if (optionFlags.testFlag(CertStoreInstall))
+    {
+        parser->addPositionalArgument("certificate", "Certificate file");
+    }
 }
 
 PDFToolOptions PDFToolAbstractApplication::getOptions(QCommandLineParser* parser) const
@@ -852,6 +857,11 @@ PDFToolOptions PDFToolAbstractApplication::getOptions(QCommandLineParser* parser
         options.certStoreEnumerateUserCertificates = parser->value("list-user-certs").toInt();
     }
 
+    if (optionFlags.testFlag(CertStoreInstall))
+    {
+        options.certificateStoreInstallCertificateFile = positionalArguments.isEmpty() ? QString() : positionalArguments.front();
+    }
+
     return options;
 }
 
diff --git a/PdfTool/pdftoolabstractapplication.h b/PdfTool/pdftoolabstractapplication.h
index 965d503..84e85eb 100644
--- a/PdfTool/pdftoolabstractapplication.h
+++ b/PdfTool/pdftoolabstractapplication.h
@@ -143,6 +143,9 @@ struct PDFToolOptions
     bool certStoreEnumerateSystemCertificates = false;
     bool certStoreEnumerateUserCertificates = true;
 
+    // For option 'CertStoreInstall'
+    QString certificateStoreInstallCertificateFile;
+
     /// Returns page range. If page range is invalid, then \p errorMessage is empty.
     /// \param pageCount Page count
     /// \param[out] errorMessage Error message
@@ -184,6 +187,7 @@ public:
         ErrorUnknown,
         ErrorNoDocumentSpecified,
         ErrorDocumentReading,
+        ErrorCertificateReading,
         ErrorInvalidArguments,
         ErrorFailedWriteToFile,
         ErrorPermissions,
@@ -223,6 +227,7 @@ public:
         Unite                           = 0x00080000,       ///< Settings for Unite tool
         Optimize                        = 0x00100000,       ///< Settings for Optimize tool
         CertStore                       = 0x00200000,       ///< Settings for certificate store tool
+        CertStoreInstall                = 0x00400000,       ///< Settings for certificate store install certificate tool
     };
     Q_DECLARE_FLAGS(Options, Option)
 
diff --git a/PdfTool/pdftoolcertstore.cpp b/PdfTool/pdftoolcertstore.cpp
index 24b830d..dae0df1 100644
--- a/PdfTool/pdftoolcertstore.cpp
+++ b/PdfTool/pdftoolcertstore.cpp
@@ -22,6 +22,7 @@ namespace pdftool
 {
 
 static PDFToolCertStore s_certStoreApplication;
+static PDFToolCertStoreInstallCertificate s_certStoreAddApplication;
 
 QString PDFToolCertStore::getStandardString(PDFToolAbstractApplication::StandardString standardString) const
 {
@@ -143,4 +144,61 @@ PDFToolAbstractApplication::Options PDFToolCertStore::getOptionsFlags() const
     return ConsoleFormat | DateFormat | CertStore;
 }
 
+QString PDFToolCertStoreInstallCertificate::getStandardString(PDFToolAbstractApplication::StandardString standardString) const
+{
+    switch (standardString)
+    {
+        case Command:
+            return "cert-store-install";
+
+        case Name:
+            return PDFToolTranslationContext::tr("Install Certificate");
+
+        case Description:
+            return PDFToolTranslationContext::tr("Install a new user certificate to certificate store.");
+
+        default:
+            Q_ASSERT(false);
+            break;
+    }
+
+    return QString();
+}
+
+int PDFToolCertStoreInstallCertificate::execute(const PDFToolOptions& options)
+{
+    QByteArray certificateData;
+    QFile file(options.certificateStoreInstallCertificateFile);
+    if (file.open(QFile::ReadOnly))
+    {
+        certificateData = file.readAll();
+        file.close();
+    }
+    else
+    {
+        PDFConsole::writeError(PDFToolTranslationContext::tr("Cannot open file '%1'. %2").arg(options.certificateStoreInstallCertificateFile, file.errorString()), options.outputCodec);
+        return ErrorCertificateReading;
+    }
+
+    pdf::PDFCertificateStore certificateStore;
+    certificateStore.loadDefaultUserCertificates();
+
+    if (certificateStore.add(pdf::PDFCertificateStore::EntryType::User, certificateData))
+    {
+        certificateStore.saveDefaultUserCertificates();
+    }
+    else
+    {
+        PDFConsole::writeError(PDFToolTranslationContext::tr("Cannot read certificate from file '%1'.").arg(options.certificateStoreInstallCertificateFile), options.outputCodec);
+        return ErrorCertificateReading;
+    }
+
+    return ExitSuccess;
+}
+
+PDFToolAbstractApplication::Options PDFToolCertStoreInstallCertificate::getOptionsFlags() const
+{
+    return ConsoleFormat | CertStoreInstall;
+}
+
 }   // namespace pdftool
diff --git a/PdfTool/pdftoolcertstore.h b/PdfTool/pdftoolcertstore.h
index 883f1a5..f34341a 100644
--- a/PdfTool/pdftoolcertstore.h
+++ b/PdfTool/pdftoolcertstore.h
@@ -31,6 +31,14 @@ public:
     virtual Options getOptionsFlags() const override;
 };
 
+class PDFToolCertStoreInstallCertificate : public PDFToolAbstractApplication
+{
+public:
+    virtual QString getStandardString(StandardString standardString) const override;
+    virtual int execute(const PDFToolOptions& options) override;
+    virtual Options getOptionsFlags() const override;
+};
+
 }   // namespace pdftool
 
 #endif // PDFTOOLCERTSTORE_H