diff --git a/src/logging.cpp b/src/logging.cpp
index 6451906..7d5119b 100644
--- a/src/logging.cpp
+++ b/src/logging.cpp
@@ -1,6 +1,12 @@
 #include "logging.h"
 #include <boost/log/sinks/unlocked_frontend.hpp>
+#include <boost/log/sinks/text_file_backend.hpp>
+#include <boost/log/sinks/sync_frontend.hpp>
 #include <boost/log/expressions.hpp>
+#include <boost/log/keywords/file_name.hpp>
+#include <boost/log/utility/setup/common_attributes.hpp>
+// ReSharper disable once CppUnusedIncludeDirective
+#include <boost/log/support/date_time.hpp>
 #include <centiseconds.h>
 #include "tools.h"
 
@@ -14,6 +20,9 @@ using std::tuple;
 using std::make_tuple;
 
 namespace expr = boost::log::expressions;
+namespace keywords = boost::log::keywords;
+namespace sinks = boost::log::sinks;
+namespace attr = boost::log::attributes;
 
 template <>
 const string& getEnumTypeName<LogLevel>() {
@@ -75,7 +84,17 @@ void PausableBackendAdapter::resume() {
 	buffer.clear();
 }
 
-boost::shared_ptr<PausableBackendAdapter> initLogging() {
+BOOST_LOG_GLOBAL_LOGGER_INIT(globalLogger, LoggerType) {
+	LoggerType logger;
+
+	logger.add_attribute("TimeStamp", attr::local_clock());
+
+	return logger;
+}
+
+BOOST_LOG_ATTRIBUTE_KEYWORD(severity, "Severity", LogLevel)
+
+boost::shared_ptr<PausableBackendAdapter> addPausableStderrSink(LogLevel minLogLevel) {
 	// Create logging backend that logs to stderr
 	auto streamBackend = boost::make_shared<text_ostream_backend>();
 	streamBackend->add_stream(boost::shared_ptr<std::ostream>(&std::cerr, [](std::ostream*) {}));
@@ -86,14 +105,24 @@ boost::shared_ptr<PausableBackendAdapter> initLogging() {
 
 	// Create a sink that feeds into the adapter
 	auto sink = boost::make_shared<unlocked_sink<PausableBackendAdapter>>(pausableAdapter);
-
-	// Set output formatting
-	sink->set_formatter(expr::stream << "[" << expr::attr<LogLevel>("Severity") << "] " << expr::smessage);
-
+	sink->set_formatter(expr::stream << "[" << severity << "] " << expr::smessage);
+	sink->set_filter(severity >= minLogLevel);
 	boost::log::core::get()->add_sink(sink);
+
 	return pausableAdapter;
 }
 
+void addFileSink(const boost::filesystem::path& logFilePath, LogLevel minLogLevel) {
+	auto textFileBackend = boost::make_shared<sinks::text_file_backend>(
+		keywords::file_name = logFilePath.string());
+	auto sink = boost::make_shared<sinks::synchronous_sink<sinks::text_file_backend>>(textFileBackend);
+	sink->set_formatter(expr::stream
+		<< "[" << expr::format_date_time<boost::posix_time::ptime>("TimeStamp", "%Y-%m-%d %H:%M:%S")
+		<< "] [" << severity << "] " << expr::smessage);
+	sink->set_filter(severity >= minLogLevel);
+	boost::log::core::get()->add_sink(sink);
+}
+
 void logTimedEvent(const string& eventName, centiseconds start, centiseconds end, const string& value) {
 	LOG_DEBUG << "##" << eventName << "[" << formatDuration(start) << "-" << formatDuration(end) << "]: " << value;
 }
diff --git a/src/logging.h b/src/logging.h
index 0d32aa7..0031b4c 100644
--- a/src/logging.h
+++ b/src/logging.h
@@ -9,6 +9,7 @@
 #include <mutex>
 #include <tuple>
 #include "centiseconds.h"
+#include <boost/filesystem.hpp>
 #include "enumTools.h"
 
 enum class LogLevel {
@@ -33,7 +34,7 @@ std::istream& operator>>(std::istream& stream, LogLevel& value);
 
 using LoggerType = boost::log::sources::severity_logger_mt<LogLevel>;
 
-BOOST_LOG_INLINE_GLOBAL_LOGGER_DEFAULT(globalLogger, LoggerType)
+BOOST_LOG_GLOBAL_LOGGER(globalLogger, LoggerType)
 
 #define LOG(level) \
 	BOOST_LOG_STREAM_WITH_PARAMS(globalLogger::get(), (::boost::log::keywords::severity = level))
@@ -61,6 +62,8 @@ private:
 	bool isPaused = false;
 };
 
-boost::shared_ptr<PausableBackendAdapter> initLogging();
+boost::shared_ptr<PausableBackendAdapter> addPausableStderrSink(LogLevel minLogLevel);
+
+void addFileSink(const boost::filesystem::path& logFilePath, LogLevel minLogLevel);
 
 void logTimedEvent(const std::string& eventName, centiseconds start, centiseconds end, const std::string& value);
diff --git a/src/main.cpp b/src/main.cpp
index e0343f2..5ecae3b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -16,6 +16,7 @@
 
 using std::exception;
 using std::string;
+using std::vector;
 using std::unique_ptr;
 using std::map;
 using std::chrono::duration;
@@ -23,6 +24,8 @@ using std::chrono::duration_cast;
 using boost::filesystem::path;
 using boost::property_tree::ptree;
 
+namespace tclap = TCLAP;
+
 string getMessage(const exception& e) {
 	string result(e.what());
 	try {
@@ -69,36 +72,45 @@ ptree createXmlTree(const path& filePath, const map<centiseconds, Phone>& phones
 	return tree;
 }
 
-// Tell TCLAP how to handle boost::optional
+// Tell TCLAP how to handle our types
 namespace TCLAP {
 	template<>
-	struct ArgTraits<boost::optional<string>> {
-		typedef TCLAP::StringLike ValueCategory;
+	struct ArgTraits<LogLevel> {
+		typedef ValueLike ValueCategory;
 	};
 }
 
 int main(int argc, char *argv[]) {
-	auto logOutputController = initLogging();
-	logOutputController->pause();
+	auto pausableStderrSink = addPausableStderrSink(LogLevel::Warning);
+	pausableStderrSink->pause();
 
 	// Define command-line parameters
 	const char argumentValueSeparator = ' ';
-	TCLAP::CmdLine cmd(appName, argumentValueSeparator, appVersion);
+	tclap::CmdLine cmd(appName, argumentValueSeparator, appVersion);
 	cmd.setExceptionHandling(false);
 	cmd.setOutput(new NiceCmdLineOutput());
-	TCLAP::UnlabeledValueArg<string> inputFileName("inputFile", "The input file. Must be a sound file in WAVE format.", true, "", "string", cmd);
-	TCLAP::ValueArg<boost::optional<string>> dialog("d", "dialog", "The text of the dialog.", false, boost::optional<string>(), "string", cmd);
+	auto logLevels = vector<LogLevel>(getEnumValues<LogLevel>());
+	tclap::ValuesConstraint<LogLevel> logLevelConstraint(logLevels);
+	tclap::ValueArg<LogLevel> logLevel("", "logLevel", "The minimum log level to log", false, LogLevel::Debug, &logLevelConstraint, cmd);
+	tclap::ValueArg<string> logFileName("", "logFile", "The log file path.", false, string(), "string", cmd);
+	tclap::ValueArg<string> dialog("d", "dialog", "The text of the dialog.", false, string(), "string", cmd);
+	tclap::UnlabeledValueArg<string> inputFileName("inputFile", "The input file. Must be a sound file in WAVE format.", true, "", "string", cmd);
 
 	try {
 		auto resumeLogging = gsl::finally([&]() {
 			std::cerr << std::endl << std::endl;
-			logOutputController->resume();
+			pausableStderrSink->resume();
 			std::cerr << std::endl;
 		});
 
 		// Parse command line
 		cmd.parse(argc, argv);
 
+		// Set up log file
+		if (logFileName.isSet()) {
+			addFileSink(path(logFileName.getValue()), logLevel.getValue());
+		}
+
 		// Detect phones
 		const int columnWidth = 30;
 		std::cerr << std::left;
@@ -108,7 +120,7 @@ int main(int argc, char *argv[]) {
 			ProgressBar progressBar;
 			phones = detectPhones(
 				createAudioStream(inputFileName.getValue()),
-				dialog.getValue(),
+				dialog.isSet() ? dialog.getValue() : boost::optional<string>(),
 				progressBar);
 		}
 		std::cerr << "Done" << std::endl;
@@ -125,12 +137,12 @@ int main(int argc, char *argv[]) {
 		boost::property_tree::write_xml(std::cout, xmlTree, boost::property_tree::xml_writer_settings<string>(' ', 2));
 
 		return 0;
-	} catch (TCLAP::ArgException& e) {
+	} catch (tclap::ArgException& e) {
 		// Error parsing command-line args.
 		cmd.getOutput()->failure(cmd, e);
 		std::cerr << std::endl;
 		return 1;
-	} catch (TCLAP::ExitException&) {
+	} catch (tclap::ExitException&) {
 		// A built-in TCLAP command (like --help) has finished. Exit application.
 		std::cerr << std::endl;
 		return 0;