diff --git a/pygmt/figure.py b/pygmt/figure.py
index 1f44e0b4ad8..f8b631e7102 100644
--- a/pygmt/figure.py
+++ b/pygmt/figure.py
@@ -306,7 +306,7 @@ def savefig(
 
         fname = Path(fname)
         prefix, suffix = fname.with_suffix("").as_posix(), fname.suffix
-        ext = suffix[1:]  # Remove the .
+        ext = suffix[1:].lower()  # Remove the . and normalize to lowercase
         # alias jpeg to jpg
         if ext == "jpeg":
             ext = "jpg"
diff --git a/pygmt/tests/test_figure.py b/pygmt/tests/test_figure.py
index d895c08785d..f01df85f942 100644
--- a/pygmt/tests/test_figure.py
+++ b/pygmt/tests/test_figure.py
@@ -83,11 +83,13 @@ def test_figure_savefig_exists():
     fig = Figure()
     fig.basemap(region="10/70/-300/800", projection="X3i/5i", frame="af")
     prefix = "test_figure_savefig_exists"
-    for fmt in "png pdf jpg jpeg bmp eps tif".split():
+    for fmt in "png pdf jpg jpeg bmp eps tif PNG JPG JPEG Png".split():
         fname = ".".join([prefix, fmt])
         fig.savefig(fname)
-        assert os.path.exists(fname)
-        os.remove(fname)
+
+        fname = Path(fname)
+        assert fname.exists()
+        fname.unlink()
 
 
 def test_figure_savefig_directory_nonexists():