diff --git a/autotests/CMakeLists.txt b/autotests/CMakeLists.txt
index 037d56f..b4232bd 100644
--- a/autotests/CMakeLists.txt
+++ b/autotests/CMakeLists.txt
@@ -122,6 +122,9 @@ if (LibHeif_FOUND)
         kimageformats_read_tests(FUZZ 1
             hej2
         )
+        kimageformats_write_tests(FUZZ 1
+            hej2-nodatacheck-lossless
+        )
     endif()
 
     if (LibHeif_VERSION VERSION_GREATER_EQUAL "1.19.6")
diff --git a/autotests/write/basic/hej2.json b/autotests/write/basic/hej2.json
new file mode 100644
index 0000000..28c1e17
--- /dev/null
+++ b/autotests/write/basic/hej2.json
@@ -0,0 +1,65 @@
+{
+    "format" : "hej2",
+    "metadata" : [
+        {
+            "key" : "CreationDate",
+            "value" : "2025-01-14T13:53:32+01:00"
+        },
+        {
+            "key" : "Direction",
+            "value" : "123.7"
+        },
+        {
+            "key" : "ModificationDate",
+            "value" : "2025-02-14T15:58:44+01:00"
+        },
+        {
+            "key" : "Software" ,
+            "value" : "Adobe Photoshop 26.2 (Windows)"
+        },
+        {
+            "key" : "Altitude",
+            "value" : "34"
+        },
+        {
+            "key" : "Author",
+            "value" : "KDE Project"
+        },
+        {
+            "key" : "Copyright",
+            "value" : "@2025 KDE Project"
+        },
+        {
+            "key" : "Description",
+            "value" : "TV broadcast test image."
+        },
+        {
+            "key" : "Latitude",
+            "value" : "44.6478"
+        },
+        {
+            "key" : "LensManufacturer",
+            "value" : "KDE Glasses"
+        },
+        {
+            "key" : "LensModel",
+            "value" : "A1234"
+        },
+        {
+            "key" : "Longitude",
+            "value" : "10.9254"
+        },
+        {
+            "key" : "Manufacturer",
+            "value" : "KFramework"
+        },
+        {
+            "key" : "Model",
+            "value" : "KImageFormats"
+        }
+    ],
+    "resolution" : {
+        "dotsPerMeterX" : 11811,
+        "dotsPerMeterY" : 11812
+    }
+}
diff --git a/autotests/write/format/hej2/Format_A2BGR30_Premultiplied.hej2 b/autotests/write/format/hej2/Format_A2BGR30_Premultiplied.hej2
new file mode 100644
index 0000000..7ada2e0
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diff --git a/autotests/write/format/hej2/Format_A2RGB30_Premultiplied.hej2 b/autotests/write/format/hej2/Format_A2RGB30_Premultiplied.hej2
new file mode 100644
index 0000000..7ada2e0
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diff --git a/autotests/write/format/hej2/Format_ARGB32.hej2 b/autotests/write/format/hej2/Format_ARGB32.hej2
new file mode 100644
index 0000000..5c89cca
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diff --git a/autotests/write/format/hej2/Format_ARGB32_Premultiplied.hej2 b/autotests/write/format/hej2/Format_ARGB32_Premultiplied.hej2
new file mode 100644
index 0000000..cbb2fa7
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diff --git a/autotests/write/format/hej2/Format_ARGB4444_Premultiplied.hej2 b/autotests/write/format/hej2/Format_ARGB4444_Premultiplied.hej2
new file mode 100644
index 0000000..3dce6cf
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diff --git a/autotests/write/format/hej2/Format_ARGB6666_Premultiplied.hej2 b/autotests/write/format/hej2/Format_ARGB6666_Premultiplied.hej2
new file mode 100644
index 0000000..1caf272
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diff --git a/autotests/write/format/hej2/Format_ARGB8555_Premultiplied.hej2 b/autotests/write/format/hej2/Format_ARGB8555_Premultiplied.hej2
new file mode 100644
index 0000000..456a178
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diff --git a/autotests/write/format/hej2/Format_ARGB8565_Premultiplied.hej2 b/autotests/write/format/hej2/Format_ARGB8565_Premultiplied.hej2
new file mode 100644
index 0000000..f9e4646
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diff --git a/autotests/write/format/hej2/Format_BGR30.hej2 b/autotests/write/format/hej2/Format_BGR30.hej2
new file mode 100644
index 0000000..6401c69
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diff --git a/autotests/write/format/hej2/Format_BGR888.hej2 b/autotests/write/format/hej2/Format_BGR888.hej2
new file mode 100644
index 0000000..22c0d55
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diff --git a/autotests/write/format/hej2/Format_CMYK8888.hej2 b/autotests/write/format/hej2/Format_CMYK8888.hej2
new file mode 100644
index 0000000..5f3e8ab
Binary files /dev/null and b/autotests/write/format/hej2/Format_CMYK8888.hej2 differ
diff --git a/autotests/write/format/hej2/Format_Grayscale16.hej2 b/autotests/write/format/hej2/Format_Grayscale16.hej2
new file mode 100644
index 0000000..acfebc5
Binary files /dev/null and b/autotests/write/format/hej2/Format_Grayscale16.hej2 differ
diff --git a/autotests/write/format/hej2/Format_Grayscale8.hej2 b/autotests/write/format/hej2/Format_Grayscale8.hej2
new file mode 100644
index 0000000..4a3a592
Binary files /dev/null and b/autotests/write/format/hej2/Format_Grayscale8.hej2 differ
diff --git a/autotests/write/format/hej2/Format_Indexed8.hej2 b/autotests/write/format/hej2/Format_Indexed8.hej2
new file mode 100644
index 0000000..4a2ab2f
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diff --git a/autotests/write/format/hej2/Format_Mono.hej2 b/autotests/write/format/hej2/Format_Mono.hej2
new file mode 100644
index 0000000..2762455
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diff --git a/autotests/write/format/hej2/Format_MonoLSB.hej2 b/autotests/write/format/hej2/Format_MonoLSB.hej2
new file mode 100644
index 0000000..2762455
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diff --git a/autotests/write/format/hej2/Format_RGB16.hej2 b/autotests/write/format/hej2/Format_RGB16.hej2
new file mode 100644
index 0000000..5b5d08d
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diff --git a/autotests/write/format/hej2/Format_RGB30.hej2 b/autotests/write/format/hej2/Format_RGB30.hej2
new file mode 100644
index 0000000..6401c69
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diff --git a/autotests/write/format/hej2/Format_RGB32.hej2 b/autotests/write/format/hej2/Format_RGB32.hej2
new file mode 100644
index 0000000..cc03401
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diff --git a/autotests/write/format/hej2/Format_RGB444.hej2 b/autotests/write/format/hej2/Format_RGB444.hej2
new file mode 100644
index 0000000..8e4a70f
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diff --git a/autotests/write/format/hej2/Format_RGB555.hej2 b/autotests/write/format/hej2/Format_RGB555.hej2
new file mode 100644
index 0000000..5db343d
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diff --git a/autotests/write/format/hej2/Format_RGB666.hej2 b/autotests/write/format/hej2/Format_RGB666.hej2
new file mode 100644
index 0000000..352ec9e
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diff --git a/autotests/write/format/hej2/Format_RGB888.hej2 b/autotests/write/format/hej2/Format_RGB888.hej2
new file mode 100644
index 0000000..22c0d55
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diff --git a/autotests/write/format/hej2/Format_RGBA16FPx4.hej2 b/autotests/write/format/hej2/Format_RGBA16FPx4.hej2
new file mode 100644
index 0000000..acb65e6
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diff --git a/autotests/write/format/hej2/Format_RGBA16FPx4_Premultiplied.hej2 b/autotests/write/format/hej2/Format_RGBA16FPx4_Premultiplied.hej2
new file mode 100644
index 0000000..acb65e6
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diff --git a/autotests/write/format/hej2/Format_RGBA32FPx4.hej2 b/autotests/write/format/hej2/Format_RGBA32FPx4.hej2
new file mode 100644
index 0000000..acb65e6
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diff --git a/autotests/write/format/hej2/Format_RGBA32FPx4_Premultiplied.hej2 b/autotests/write/format/hej2/Format_RGBA32FPx4_Premultiplied.hej2
new file mode 100644
index 0000000..acb65e6
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diff --git a/autotests/write/format/hej2/Format_RGBA64.hej2 b/autotests/write/format/hej2/Format_RGBA64.hej2
new file mode 100644
index 0000000..5c89cca
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diff --git a/autotests/write/format/hej2/Format_RGBA64_Premultiplied.hej2 b/autotests/write/format/hej2/Format_RGBA64_Premultiplied.hej2
new file mode 100644
index 0000000..acb65e6
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diff --git a/autotests/write/format/hej2/Format_RGBA8888.hej2 b/autotests/write/format/hej2/Format_RGBA8888.hej2
new file mode 100644
index 0000000..5c89cca
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diff --git a/autotests/write/format/hej2/Format_RGBA8888_Premultiplied.hej2 b/autotests/write/format/hej2/Format_RGBA8888_Premultiplied.hej2
new file mode 100644
index 0000000..cbb2fa7
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diff --git a/autotests/write/format/hej2/Format_RGBX16FPx4.hej2 b/autotests/write/format/hej2/Format_RGBX16FPx4.hej2
new file mode 100644
index 0000000..22c0d55
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diff --git a/autotests/write/format/hej2/Format_RGBX32FPx4.hej2 b/autotests/write/format/hej2/Format_RGBX32FPx4.hej2
new file mode 100644
index 0000000..22c0d55
Binary files /dev/null and b/autotests/write/format/hej2/Format_RGBX32FPx4.hej2 differ
diff --git a/autotests/write/format/hej2/Format_RGBX64.hej2 b/autotests/write/format/hej2/Format_RGBX64.hej2
new file mode 100644
index 0000000..22c0d55
Binary files /dev/null and b/autotests/write/format/hej2/Format_RGBX64.hej2 differ
diff --git a/autotests/write/format/hej2/Format_RGBX8888.hej2 b/autotests/write/format/hej2/Format_RGBX8888.hej2
new file mode 100644
index 0000000..22c0d55
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diff --git a/autotests/writetest.cpp b/autotests/writetest.cpp
index 8fbb228..91238b7 100644
--- a/autotests/writetest.cpp
+++ b/autotests/writetest.cpp
@@ -634,14 +634,18 @@ int main(int argc, char **argv)
     const QList<QByteArray> read_formats = QImageReader::supportedImageFormats();
     const QList<QByteArray> write_formats = QImageWriter::supportedImageFormats();
 
-    if (!read_formats.contains(format) && format == "heif") {
-        QTextStream(stdout) << "WARNING : libheif configuration is missing necessary decoder(s)!\n";
-        return 0;
+    if (!read_formats.contains(format)) {
+        if (format == "heif" || format == "hej2") {
+            QTextStream(stdout) << "WARNING : libheif configuration is missing necessary decoder(s)!\n";
+            return 0;
+        }
     }
 
-    if (!write_formats.contains(format) && format == "heif") {
-        QTextStream(stdout) << "WARNING : libheif configuration is missing necessary encoder(s)!\n";
-        return 0;
+    if (!write_formats.contains(format)) {
+        if (format == "heif" || format == "hej2") {
+            QTextStream(stdout) << "WARNING : libheif configuration is missing necessary encoder(s)!\n";
+            return 0;
+        }
     }
 
     // run test