diff --git a/src/libs/libpng/lv_libpng.c b/src/libs/libpng/lv_libpng.c
index 89340dea6..15578f7ab 100644
--- a/src/libs/libpng/lv_libpng.c
+++ b/src/libs/libpng/lv_libpng.c
@@ -271,10 +271,6 @@ static lv_draw_buf_t * decode_png(lv_image_decoder_dsc_t * dsc)
     image.version = PNG_IMAGE_VERSION;
 
     if(dsc->src_type == LV_IMAGE_SRC_FILE) {
-        if(lv_strcmp(lv_fs_get_ext(dsc->src), "png") != 0) {              /*Check the extension*/
-            return NULL;
-        }
-
         png_data = alloc_file(dsc->src, &png_data_size);
         if(png_data == NULL) {
             LV_LOG_WARN("can't load file: %s", (const char *)dsc->src);
diff --git a/src/libs/lodepng/lv_lodepng.c b/src/libs/lodepng/lv_lodepng.c
index cef4cbc2f..d9db17dd1 100644
--- a/src/libs/lodepng/lv_lodepng.c
+++ b/src/libs/lodepng/lv_lodepng.c
@@ -145,17 +145,16 @@ static lv_result_t decoder_open(lv_image_decoder_t * decoder, lv_image_decoder_d
     size_t png_data_size = 0;
     if(dsc->src_type == LV_IMAGE_SRC_FILE) {
         const char * fn = dsc->src;
-        if(lv_strcmp(lv_fs_get_ext(fn), "png") == 0) {              /*Check the extension*/
-            unsigned error;
-            error = lodepng_load_file((void *)&png_data, &png_data_size, fn);  /*Load the file*/
-            if(error) {
-                if(png_data != NULL) {
-                    lv_free((void *)png_data);
-                }
-                LV_LOG_WARN("error %u: %s\n", error, lodepng_error_text(error));
-                LV_PROFILER_DECODER_END_TAG("lv_lodepng_decoder_open");
-                return LV_RESULT_INVALID;
+
+        /*Load the file*/
+        unsigned error = lodepng_load_file((void *)&png_data, &png_data_size, fn);
+        if(error) {
+            if(png_data != NULL) {
+                lv_free((void *)png_data);
             }
+            LV_LOG_WARN("error %u: %s\n", error, lodepng_error_text(error));
+            LV_PROFILER_DECODER_END_TAG("lv_lodepng_decoder_open");
+            return LV_RESULT_INVALID;
         }
     }
     else if(dsc->src_type == LV_IMAGE_SRC_VARIABLE) {
diff --git a/tests/ref_imgs/libs/png_1.png b/tests/ref_imgs/libs/png_1.png
index b45e030f6..4d968feb2 100644
Binary files a/tests/ref_imgs/libs/png_1.png and b/tests/ref_imgs/libs/png_1.png differ
diff --git a/tests/ref_imgs/libs/png_2.png b/tests/ref_imgs/libs/png_2.png
deleted file mode 100644
index b45e030f6..000000000
Binary files a/tests/ref_imgs/libs/png_2.png and /dev/null differ
diff --git a/tests/ref_imgs_vg_lite/libs/png_1.png b/tests/ref_imgs_vg_lite/libs/png_1.png
index 13d0cb00e..28a7f5170 100644
Binary files a/tests/ref_imgs_vg_lite/libs/png_1.png and b/tests/ref_imgs_vg_lite/libs/png_1.png differ
diff --git a/tests/ref_imgs_vg_lite/libs/png_2.png b/tests/ref_imgs_vg_lite/libs/png_2.png
deleted file mode 100644
index 13d0cb00e..000000000
Binary files a/tests/ref_imgs_vg_lite/libs/png_2.png and /dev/null differ
diff --git a/tests/src/test_assets/test_img_lvgl_logo_png_no_ext b/tests/src/test_assets/test_img_lvgl_logo_png_no_ext
new file mode 100644
index 000000000..aaaa7b05f
Binary files /dev/null and b/tests/src/test_assets/test_img_lvgl_logo_png_no_ext differ
diff --git a/tests/src/test_cases/libs/test_libpng.c b/tests/src/test_cases/libs/test_libpng.c
index 714eab355..4db9b80c5 100644
--- a/tests/src/test_cases/libs/test_libpng.c
+++ b/tests/src/test_cases/libs/test_libpng.c
@@ -15,40 +15,40 @@ void tearDown(void)
     /* Function run after every test */
 }
 
+static void create_image_item(lv_obj_t * parent, const void * src, const char * text)
+{
+    lv_obj_t * cont = lv_obj_create(parent);
+    lv_obj_remove_style_all(cont);
+    lv_obj_set_size(cont, 300, 200);
+    lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_COLUMN);
+    lv_obj_set_flex_align(cont, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
+
+    lv_obj_t * img = lv_image_create(cont);
+    lv_image_set_src(img, src);
+
+    lv_obj_t * label = lv_label_create(cont);
+    lv_label_set_text(label, text);
+}
+
 static void create_images(void)
 {
-    lv_obj_clean(lv_screen_active());
-
-    lv_obj_t * img;
-    lv_obj_t * label;
+    lv_obj_t * screen = lv_screen_active();
+    lv_obj_clean(screen);
+    lv_obj_set_flex_flow(screen, LV_FLEX_FLOW_ROW_WRAP);
+    lv_obj_set_flex_align(screen, LV_FLEX_ALIGN_SPACE_AROUND, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
 
     /* PNG array */
     LV_IMAGE_DECLARE(test_img_lvgl_logo_png);
-    img = lv_image_create(lv_screen_active());
-    lv_image_set_src(img, &test_img_lvgl_logo_png);
-    lv_obj_align(img, LV_ALIGN_CENTER, -100, -20);
-
-    label = lv_label_create(lv_screen_active());
-    lv_label_set_text(label, "Array");
-    lv_obj_align(label, LV_ALIGN_CENTER, -100, 20);
+    create_image_item(screen, &test_img_lvgl_logo_png, "Array");
 
     /* 32 bit PNG file */
-    img = lv_image_create(lv_screen_active());
-    lv_image_set_src(img, "A:src/test_assets/test_img_lvgl_logo.png");
-    lv_obj_align(img, LV_ALIGN_CENTER, 100, -100);
+    create_image_item(screen, "A:src/test_assets/test_img_lvgl_logo.png", "File (32 bit)");
 
-    label = lv_label_create(lv_screen_active());
-    lv_label_set_text(label, "File (32 bit)");
-    lv_obj_align(label, LV_ALIGN_CENTER, 100, -60);
+    /* No extension PNG file */
+    create_image_item(screen, "A:src/test_assets/test_img_lvgl_logo_png_no_ext", "File (32 bit) No Extension");
 
     /* 8 bit palette PNG file */
-    img = lv_image_create(lv_screen_active());
-    lv_image_set_src(img, "A:src/test_assets/test_img_lvgl_logo_8bit_palette.png");
-    lv_obj_align(img, LV_ALIGN_CENTER, 100, 60);
-
-    label = lv_label_create(lv_screen_active());
-    lv_label_set_text(label, "File (8 bit palette)");
-    lv_obj_align(label, LV_ALIGN_CENTER, 100, 100);
+    create_image_item(screen, "A:src/test_assets/test_img_lvgl_logo_8bit_palette.png", "File (8 bit palette)");
 }
 
 void test_libpng_1(void)
@@ -58,7 +58,7 @@ void test_libpng_1(void)
 
     create_images();
 
-    TEST_ASSERT_EQUAL_SCREENSHOT("libs/png_2.png");
+    TEST_ASSERT_EQUAL_SCREENSHOT("libs/png_1.png");
 
     size_t mem_before = lv_test_get_free_mem();
     for(uint32_t i = 0; i < 20; i++) {
@@ -68,7 +68,7 @@ void test_libpng_1(void)
         lv_refr_now(NULL);
     }
 
-    TEST_ASSERT_EQUAL_SCREENSHOT("libs/png_2.png");
+    TEST_ASSERT_EQUAL_SCREENSHOT("libs/png_1.png");
 
     TEST_ASSERT_MEM_LEAK_LESS_THAN(mem_before, 32);
 
diff --git a/tests/src/test_cases/libs/test_lodepng.c b/tests/src/test_cases/libs/test_lodepng.c
index 5f3f1cf78..aae78f309 100644
--- a/tests/src/test_cases/libs/test_lodepng.c
+++ b/tests/src/test_cases/libs/test_lodepng.c
@@ -15,40 +15,40 @@ void tearDown(void)
     /* Function run after every test */
 }
 
+static void create_image_item(lv_obj_t * parent, const void * src, const char * text)
+{
+    lv_obj_t * cont = lv_obj_create(parent);
+    lv_obj_remove_style_all(cont);
+    lv_obj_set_size(cont, 300, 200);
+    lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_COLUMN);
+    lv_obj_set_flex_align(cont, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
+
+    lv_obj_t * img = lv_image_create(cont);
+    lv_image_set_src(img, src);
+
+    lv_obj_t * label = lv_label_create(cont);
+    lv_label_set_text(label, text);
+}
+
 static void create_images(void)
 {
-    lv_obj_clean(lv_screen_active());
-
-    lv_obj_t * img;
-    lv_obj_t * label;
+    lv_obj_t * screen = lv_screen_active();
+    lv_obj_clean(screen);
+    lv_obj_set_flex_flow(screen, LV_FLEX_FLOW_ROW_WRAP);
+    lv_obj_set_flex_align(screen, LV_FLEX_ALIGN_SPACE_AROUND, LV_FLEX_ALIGN_CENTER, LV_FLEX_ALIGN_CENTER);
 
     /* PNG array */
     LV_IMAGE_DECLARE(test_img_lvgl_logo_png);
-    img = lv_image_create(lv_screen_active());
-    lv_image_set_src(img, &test_img_lvgl_logo_png);
-    lv_obj_align(img, LV_ALIGN_CENTER, -100, -20);
-
-    label = lv_label_create(lv_screen_active());
-    lv_label_set_text(label, "Array");
-    lv_obj_align(label, LV_ALIGN_CENTER, -100, 20);
+    create_image_item(screen, &test_img_lvgl_logo_png, "Array");
 
     /* 32 bit PNG file */
-    img = lv_image_create(lv_screen_active());
-    lv_image_set_src(img, "A:src/test_assets/test_img_lvgl_logo.png");
-    lv_obj_align(img, LV_ALIGN_CENTER, 100, -100);
+    create_image_item(screen, "A:src/test_assets/test_img_lvgl_logo.png", "File (32 bit)");
 
-    label = lv_label_create(lv_screen_active());
-    lv_label_set_text(label, "File (32 bit)");
-    lv_obj_align(label, LV_ALIGN_CENTER, 100, -60);
+    /* No extension PNG file */
+    create_image_item(screen, "A:src/test_assets/test_img_lvgl_logo_png_no_ext", "File (32 bit) No Extension");
 
     /* 8 bit palette PNG file */
-    img = lv_image_create(lv_screen_active());
-    lv_image_set_src(img, "A:src/test_assets/test_img_lvgl_logo_8bit_palette.png");
-    lv_obj_align(img, LV_ALIGN_CENTER, 100, 60);
-
-    label = lv_label_create(lv_screen_active());
-    lv_label_set_text(label, "File (8 bit palette)");
-    lv_obj_align(label, LV_ALIGN_CENTER, 100, 100);
+    create_image_item(screen, "A:src/test_assets/test_img_lvgl_logo_8bit_palette.png", "File (8 bit palette)");
 }
 
 void test_lodepng_1(void)