diff --git a/openVulkanoCpp/IO/Files/Pnm.hpp b/openVulkanoCpp/IO/Files/Pnm.hpp
index f5c4652..99e8e96 100644
--- a/openVulkanoCpp/IO/Files/Pnm.hpp
+++ b/openVulkanoCpp/IO/Files/Pnm.hpp
@@ -87,8 +87,25 @@ namespace OpenVulkano
 			if (val > 6) throw std::runtime_error("Malformed PNM header!");
 			pnmHeader.ascii = val < 4;
 			pnmHeader.color = static_cast<ColorMode>(val - 3);
-			inStream >> pnmHeader.width >> pnmHeader.height;
-			inStream >> pnmHeader.maxValue;
+
+			if (!(inStream >> pnmHeader.width >> pnmHeader.height))
+			{
+				throw std::runtime_error("Malformed PNM header: Unable to read width and height!");
+			}
+			if (pnmHeader.width == 0 || pnmHeader.height == 0)
+			{
+				throw std::runtime_error("Malformed PNM header: Width and height must be positive!");
+			}
+
+			if (!(inStream >> pnmHeader.maxValue))
+			{
+				throw std::runtime_error("Malformed PNM header: Unable to read maxValue!");
+			}
+			if (pnmHeader.maxValue == 0 || pnmHeader.maxValue > 65535)
+			{
+				throw std::runtime_error("Malformed PNM header: Invalid maxValue (must be between 1 and 65535)!");
+			}
+
 			inStream.get();
 			return inStream;
 		}
diff --git a/tests/Files/Pnm.cpp b/tests/Files/Pnm.cpp
new file mode 100644
index 0000000..68cc035
--- /dev/null
+++ b/tests/Files/Pnm.cpp
@@ -0,0 +1,200 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include <catch2/catch_all.hpp>
+
+#include "IO/Files/Pnm.hpp"
+
+#include <sstream>
+#include <cmath>
+#include <memory>
+#include <stdexcept>
+#include <string_view>
+#include <string>
+
+using namespace OpenVulkano;
+
+namespace
+{
+	bool almostEqual(float a, float b, float epsilon = 0.001f) { return std::fabs(a - b) < epsilon; }
+}
+
+TEST_CASE("Default constructor initializes with expected values", "[Pnm]")
+{
+	PnmHeader header;
+
+	REQUIRE(header.width == 0);
+	REQUIRE(header.height == 0);
+	REQUIRE(header.maxValue == 0);
+	REQUIRE(header.color == PnmHeader::ColorMode::GRAY);
+	REQUIRE(header.ascii == false);
+}
+
+TEST_CASE("Constructor initializes with correct values", "[Pnm]")
+{
+	PnmHeader header;
+
+	header = PnmHeader(100, 200, true);
+
+	REQUIRE(header.width == 100);
+	REQUIRE(header.height == 200);
+	REQUIRE(header.maxValue == 255);
+	REQUIRE(header.color == PnmHeader::ColorMode::COLOR);
+	REQUIRE(header.ascii == false);
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::BW, 127, true);
+
+	REQUIRE(header.width == 100);
+	REQUIRE(header.height == 200);
+	REQUIRE(header.maxValue == 127);
+	REQUIRE(header.color == PnmHeader::ColorMode::BW);
+	REQUIRE(header.ascii == true);
+}
+
+TEST_CASE("GetFileType returns correct file type", "[Pnm]")
+{
+	PnmHeader header;
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::BW);
+	REQUIRE(header.GetFileType() == "PBM");
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::GRAY);
+	REQUIRE(header.GetFileType() == "PGM");
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::COLOR);
+	REQUIRE(header.GetFileType() == "PPM");
+}
+
+TEST_CASE("GetFileExtension returns correct file extension", "[Pnm]")
+{
+	PnmHeader header;
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::BW);
+	REQUIRE(header.GetFileExtension() == ".pbm");
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::GRAY);
+	REQUIRE(header.GetFileExtension() == ".pgm");
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::COLOR);
+	REQUIRE(header.GetFileExtension() == ".ppm");
+}
+
+TEST_CASE("GetMagicNumberValue and GetMagicNumberChar return correct values", "[Pnm]")
+{
+	PnmHeader header;
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::BW, 255, true);
+	REQUIRE(header.GetMagicNumberValue() == 1);
+	REQUIRE(header.GetMagicNumberChar() == '1');
+
+	header = PnmHeader(100, 200, PnmHeader::ColorMode::COLOR, 255, false);
+	REQUIRE(header.GetMagicNumberValue() == 6);
+	REQUIRE(header.GetMagicNumberChar() == '6');
+}
+
+TEST_CASE("GetImageSize returns correct size", "[Pnm]")
+{
+	PnmHeader header;
+	header = PnmHeader(8, 8, PnmHeader::ColorMode::BW);
+	REQUIRE(header.GetImageSize() == 8);
+
+	header = PnmHeader(100, 100, PnmHeader::ColorMode::GRAY);
+	REQUIRE(header.GetImageSize() == 10000);
+
+	header = PnmHeader(50, 50, PnmHeader::ColorMode::COLOR);
+	REQUIRE(header.GetImageSize() == 7500);
+
+	header = PnmHeader(50, 50, PnmHeader::ColorMode::COLOR, 65535);
+	REQUIRE(header.GetImageSize() == 15000);
+}
+
+TEST_CASE("Ostream operator<< outputs correct header", "[Pnm]")
+{
+	PnmHeader header(100, 200, PnmHeader::ColorMode::COLOR, 255, false);
+	std::stringstream ss;
+	ss << header;
+
+	std::string expectedOutput = "P6\n100 200\n255\n";
+	REQUIRE(ss.str() == expectedOutput);
+}
+
+TEST_CASE("Istream operator>> reads correctly formatted PNM header", "[Pnm]")
+{
+	std::string pnmData = "P6\n100 200\n255\n";
+	std::stringstream ss(pnmData);
+
+	PnmHeader header;
+	ss >> header;
+
+	REQUIRE(header.width == 100);
+	REQUIRE(header.height == 200);
+	REQUIRE(header.maxValue == 255);
+	REQUIRE(header.color == PnmHeader::ColorMode::COLOR);
+	REQUIRE(header.ascii == false);
+}
+
+TEST_CASE("Istream operator>> throws on malformed header", "[Pnm]")
+{
+	{
+		std::string malformedData = "X6\n100 200\n255\n";
+		std::stringstream ss(malformedData);
+
+		PnmHeader header;
+		REQUIRE_THROWS_AS(ss >> header, std::runtime_error);
+	}
+
+	{
+		std::string malformedData = "P9\n100 200\n255\n";
+		std::stringstream ss(malformedData);
+
+		PnmHeader header;
+		REQUIRE_THROWS_AS(ss >> header, std::runtime_error);
+	}
+
+	{
+		std::string malformedData = "P6\n100\n255\n";
+		std::stringstream ss(malformedData);
+
+		PnmHeader header;
+		REQUIRE_THROWS_AS(ss >> header, std::runtime_error);
+	}
+
+	{
+		std::string malformedData = "GarbageInput";
+		std::stringstream ss(malformedData);
+
+		PnmHeader header;
+		REQUIRE_THROWS_AS(ss >> header, std::runtime_error);
+	}
+}
+
+TEST_CASE("Read throws on unsupported ascii mode", "[Pnm]")
+{
+	std::string pnmData = "P3\n100 100\n255\n";
+	std::stringstream ss(pnmData);
+
+	PnmImage image;
+	REQUIRE_THROWS_AS(image.Read(ss), std::runtime_error);
+}
+
+TEST_CASE("Read successfully reads binary image data", "[Pnm]")
+{
+	std::string pnmHeader = "P6\n2 2\n255\n";
+	std::string pnmImage = "\xFF\x00\x00\x00\xFF\x00\x00\x00\xFF\xFF\x00\x00";
+	std::stringstream ss(pnmHeader + pnmImage);
+
+	PnmImage image;
+	REQUIRE_NOTHROW(image.Read(ss));
+
+	REQUIRE(image.header.width == 2);
+	REQUIRE(image.header.height == 2);
+	REQUIRE(image.header.maxValue == 255);
+	REQUIRE(image.header.color == PnmHeader::ColorMode::COLOR);
+
+	REQUIRE(image.image[0] == '\xFF');
+	REQUIRE(image.image[1] == '\x00');
+	REQUIRE(image.image[2] == '\x00');
+}
\ No newline at end of file