diff --git a/bin/phpstan b/bin/phpstan
index b5dff81ecd..a73ce1646b 100755
--- a/bin/phpstan
+++ b/bin/phpstan
@@ -4,6 +4,7 @@
 use PHPStan\Command\AnalyseCommand;
 use PHPStan\Command\ClearResultCacheCommand;
 use PHPStan\Command\DumpDependenciesCommand;
+use PHPStan\Command\ReformatCommand;
 use PHPStan\Command\WorkerCommand;
 
 (function () {
@@ -75,6 +76,7 @@ use PHPStan\Command\WorkerCommand;
 	$reversedComposerAutoloaderProjectPaths = array_reverse($composerAutoloaderProjectPaths);
 	$application->add(new AnalyseCommand($reversedComposerAutoloaderProjectPaths));
 	$application->add(new DumpDependenciesCommand($reversedComposerAutoloaderProjectPaths));
+	$application->add(new ReformatCommand());
 	$application->add(new WorkerCommand($reversedComposerAutoloaderProjectPaths));
 	$application->add(new ClearResultCacheCommand($reversedComposerAutoloaderProjectPaths));
 	$application->run();
diff --git a/src/Command/JsonErrorFormatterDeserializer.php b/src/Command/JsonErrorFormatterDeserializer.php
new file mode 100644
index 0000000000..ab087add0c
--- /dev/null
+++ b/src/Command/JsonErrorFormatterDeserializer.php
@@ -0,0 +1,46 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Command;
+
+use Nette\Utils\Json;
+
+class JsonErrorFormatterDeserializer
+{
+
+	/**
+	 * inverse of @see \PHPStan\Command\ErrorFormatter\JsonErrorFormatter
+	 *
+	 * @param string $jsonString produced by JsonErrorFormatter
+	 *
+	 * @throws \Nette\Utils\JsonException
+	 */
+	public static function deserializeErrors(string $jsonString): AnalysisResult
+	{
+		$json = Json::decode($jsonString, Json::FORCE_ARRAY);
+
+		$notFileSpecificErrors = $json['errors'] ?? [];
+
+		$fileSpecificErrors = [];
+
+		foreach ($json['files'] ?? [] as $file => ['messages' => $messages]) {
+			foreach ($messages as $message) {
+				$fileSpecificErrors[] = new \PHPStan\Analyser\Error(
+					$message['message'],
+					$file,
+					$message['line'] ?? null,
+					$message['ignorable']
+				);
+			}
+		}
+
+		return new AnalysisResult(
+			$fileSpecificErrors,
+			$notFileSpecificErrors,
+			[],
+			false,
+			false,
+			null
+		);
+	}
+
+}
diff --git a/src/Command/ReformatCommand.php b/src/Command/ReformatCommand.php
new file mode 100644
index 0000000000..4a0f7c605d
--- /dev/null
+++ b/src/Command/ReformatCommand.php
@@ -0,0 +1,87 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Command;
+
+use PHPStan\Command\ErrorFormatter\ErrorFormatter;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class ReformatCommand extends Command
+{
+
+	private const NAME = 'reformat';
+
+	protected function configure(): void
+	{
+		$this->setName(self::NAME)
+			->setDescription('Read a previously generated analysis result from STDIN in JSON format and converts it to a different format')
+			->setDefinition([
+				new InputOption('error-format', null, InputOption::VALUE_REQUIRED, 'Format in which to print the result of the analysis', 'table'),
+				new InputOption('memory-limit', null, InputOption::VALUE_REQUIRED, 'Memory limit for the run'),
+				new InputOption('xdebug', null, InputOption::VALUE_NONE, 'Allow running with XDebug for debugging purposes'),
+			]);
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output): int
+	{
+		$memoryLimit = $input->getOption('memory-limit');
+		$allowXdebug = $input->getOption('xdebug');
+
+		if ((!is_string($memoryLimit) && $memoryLimit !== null)
+			|| (!is_bool($allowXdebug))
+		) {
+			throw new \PHPStan\ShouldNotHappenException();
+		}
+
+		$inceptionResult = CommandHelper::begin(
+			$input,
+			$output,
+			['.'],
+			null,
+			$memoryLimit,
+			null,
+			[],
+			null,
+			null,
+			$allowXdebug
+		);
+
+		$errorFormat = $input->getOption('error-format');
+		if (!is_string($errorFormat)) {
+			throw new \PHPStan\ShouldNotHappenException();
+		}
+
+		$errorOutput = $inceptionResult->getErrorOutput();
+		$container = $inceptionResult->getContainer();
+
+		$errorFormatterServiceName = sprintf('errorFormatter.%s', $errorFormat);
+		if (!$container->hasService($errorFormatterServiceName)) {
+			$errorOutput->writeLineFormatted(sprintf(
+				'Error formatter "%s" not found. Available error formatters are: %s',
+				$errorFormat,
+				implode(', ', array_map(static function (string $name): string {
+					return substr($name, strlen('errorFormatter.'));
+				}, $container->findServiceNamesByType(ErrorFormatter::class)))
+			));
+			return 1;
+		}
+
+		/** @var ErrorFormatter $errorFormatter */
+		$errorFormatter = $container->getService($errorFormatterServiceName);
+
+		if (!defined('STDIN')) {
+			$errorOutput->writeLineFormatted('STDIN is not defined');
+			return 1;
+		}
+		$jsonString = stream_get_contents(STDIN);
+		if ($jsonString === false) {
+			$errorOutput->writeLineFormatted('reading from STDIN failed');
+			return 1;
+		}
+		$analysisResult = JsonErrorFormatterDeserializer::deserializeErrors($jsonString);
+		return $errorFormatter->formatErrors($analysisResult, $inceptionResult->getStdOutput());
+	}
+
+}
diff --git a/tests/PHPStan/Command/CaptureOutput.php b/tests/PHPStan/Command/CaptureOutput.php
new file mode 100644
index 0000000000..317a73d410
--- /dev/null
+++ b/tests/PHPStan/Command/CaptureOutput.php
@@ -0,0 +1,93 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Command;
+
+/**
+ * Test helper to capture and verify output
+ */
+class CaptureOutput implements Output
+{
+
+	/** @var string */
+	private $result = '';
+
+	public function writeFormatted(string $message): void
+	{
+		$this->result .= $message;
+	}
+
+	public function writeLineFormatted(string $message): void
+	{
+		$this->result .= $message . "\n";
+	}
+
+	public function writeRaw(string $message): void
+	{
+		$this->result .= $message;
+	}
+
+	public function getStyle(): OutputStyle
+	{
+		return new class implements OutputStyle {
+
+			public function title(string $message): void
+			{
+			}
+
+			public function section(string $message): void
+			{
+			}
+
+			public function listing(array $elements): void
+			{
+			}
+
+			public function success(string $message): void
+			{
+			}
+
+			public function error(string $message): void
+			{
+			}
+
+			public function warning(string $message): void
+			{
+			}
+
+			public function note(string $message): void
+			{
+			}
+
+			public function caution(string $message): void
+			{
+			}
+
+			public function table(array $headers, array $rows): void
+			{
+			}
+
+			public function newLine(int $count = 1): void
+			{
+			}
+
+			public function progressStart(int $max = 0): void
+			{
+			}
+
+			public function progressAdvance(int $step = 1): void
+			{
+			}
+
+			public function progressFinish(): void
+			{
+			}
+
+		};
+	}
+
+	public function getResult(): string
+	{
+		return $this->result;
+	}
+
+}
diff --git a/tests/PHPStan/Command/JsonErrorFormatterDeserializerTest.php b/tests/PHPStan/Command/JsonErrorFormatterDeserializerTest.php
new file mode 100644
index 0000000000..08ae984d51
--- /dev/null
+++ b/tests/PHPStan/Command/JsonErrorFormatterDeserializerTest.php
@@ -0,0 +1,63 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Command;
+
+use PHPStan\Analyser\Error;
+use PHPStan\Command\ErrorFormatter\JsonErrorFormatter;
+use PHPStan\Testing\TestCase;
+
+class JsonErrorFormatterDeserializerTest extends TestCase
+{
+
+	public function testJsonIsBidirectional(): void
+	{
+		$jsonFormatter = new JsonErrorFormatter(true);
+
+		$firstSerialization = new CaptureOutput();
+		$jsonFormatter->formatErrors(self::createSampleAnalysisResult(), $firstSerialization);
+
+		$parsedAnalysisResult = JsonErrorFormatterDeserializer::deserializeErrors($firstSerialization->getResult());
+
+		$secondSerialization = new CaptureOutput();
+		$jsonFormatter->formatErrors($parsedAnalysisResult, $secondSerialization);
+
+		self::assertEquals('{', $firstSerialization->getResult()[0]);
+		self::assertEquals($firstSerialization->getResult(), $secondSerialization->getResult());
+	}
+
+	private static function createSampleAnalysisResult(): AnalysisResult
+	{
+		$fileSpecificErrors = [
+			new Error(
+				'Cushioned proxy should only be used untethered',
+				'src/Code.php',
+				42,
+				true
+			),
+			new Error(
+				'Liaised mutex found to be grandfathered',
+				'src/MoreCode.php',
+				43,
+				false
+			),
+		];
+
+		$notFileSpecificErrors = [
+			'Orchestration was under quarantine',
+		];
+
+		$warnings = [
+			'Technobabble detected',
+		];
+
+		return new AnalysisResult(
+			$fileSpecificErrors,
+			$notFileSpecificErrors,
+			$warnings,
+			false,
+			false,
+			'./jsontest.neon'
+		);
+	}
+
+}