diff --git a/hed/tools/visualization/__init__.py b/hed/tools/visualization/__init__.py
index a40c0333b..389ba92f8 100644
--- a/hed/tools/visualization/__init__.py
+++ b/hed/tools/visualization/__init__.py
@@ -1 +1 @@
-from .tag_word_cloud import create_wordcloud, summary_to_dict
+from .tag_word_cloud import create_wordcloud, summary_to_dict, word_cloud_to_svg
diff --git a/hed/tools/visualization/tag_word_cloud.py b/hed/tools/visualization/tag_word_cloud.py
index 68a3a257d..9f9092cba 100644
--- a/hed/tools/visualization/tag_word_cloud.py
+++ b/hed/tools/visualization/tag_word_cloud.py
@@ -1,9 +1,9 @@
 import numpy as np
 from PIL import Image
-from hed.tools.visualization.word_cloud_util import default_color_func, WordCloud
+from hed.tools.visualization.word_cloud_util import default_color_func, WordCloud, generate_contour_svg
 
 
-def create_wordcloud(word_dict, mask_path=None, background_color=None, width=400, height=200, **kwargs):
+def create_wordcloud(word_dict, mask_path=None, background_color=None, width=400, height=None, **kwargs):
     """Takes a word dict and returns a generated word cloud object
 
     Parameters:
@@ -25,6 +25,13 @@ def create_wordcloud(word_dict, mask_path=None, background_color=None, width=400
         mask_image = load_and_resize_mask(mask_path, width, height)
         width = mask_image.shape[1]
         height = mask_image.shape[0]
+    if height is None:
+        if width is None:
+            width = 400
+        height = width // 2
+    if width is None:
+        width = height * 2
+
     kwargs.setdefault('contour_width', 3)
     kwargs.setdefault('contour_color', 'black')
     kwargs.setdefault('prefer_horizontal', 0.75)
@@ -41,6 +48,20 @@ def create_wordcloud(word_dict, mask_path=None, background_color=None, width=400
     return wc
 
 
+def word_cloud_to_svg(wc):
+    """Takes word cloud and returns it as an SVG string.
+
+    Parameters:
+        wc(WordCloud): the word cloud object
+    Returns:
+        svg_string(str): The svg for the word cloud
+    """
+    svg_string = wc.to_svg()
+    svg_string = svg_string.replace("fill:", "fill:rgb")
+    svg_string = svg_string.replace("</svg>", generate_contour_svg(wc, wc.width, wc.height) + "</svg>")
+    return svg_string
+
+
 def summary_to_dict(summary, transform=np.log10, adjustment=5):
     """Converts a HedTagSummary json dict into the word cloud input format
 
diff --git a/hed/tools/visualization/word_cloud_util.py b/hed/tools/visualization/word_cloud_util.py
index 6071a138a..490be199f 100644
--- a/hed/tools/visualization/word_cloud_util.py
+++ b/hed/tools/visualization/word_cloud_util.py
@@ -7,14 +7,31 @@
 from wordcloud import WordCloud
 
 
-def _draw_contour(wc, img):
+def generate_contour_svg(wc, width, height):
+    """Generates an SVG contour mask based on a word cloud object and dimensions.
+
+    Parameters:
+        wc (WordCloud): The word cloud object.
+        width (int): SVG image width in pixels.
+        height (int): SVG image height in pixels.
+
+    Returns:
+        str: SVG point list for the contour mask, or empty string if not generated.
+    """
+    contour = _get_contour_mask(wc, width, height)
+    if contour is None:
+        return ""
+    return _numpy_to_svg(contour)
+
+
+def _get_contour_mask(wc, width, height):
     """Slightly tweaked copy of internal WorldCloud function to allow transparency"""
     if wc.mask is None or wc.contour_width == 0 or wc.contour_color is None:
-        return img
+        return None
 
     mask = wc._get_bolean_mask(wc.mask) * 255
     contour = Image.fromarray(mask.astype(np.uint8))
-    contour = contour.resize(img.size)
+    contour = contour.resize((width, height))
     contour = contour.filter(ImageFilter.FIND_EDGES)
     contour = np.array(contour)
 
@@ -22,6 +39,15 @@ def _draw_contour(wc, img):
     contour[[0, -1], :] = 0
     contour[:, [0, -1]] = 0
 
+    return contour
+
+
+def _draw_contour(wc, img):
+    """Slightly tweaked copy of internal WorldCloud function to allow transparency"""
+    contour = _get_contour_mask(wc, img.width, img.height)
+    if contour is None:
+        return img
+
     # use gaussian to change width, divide by 10 to give more resolution
     radius = wc.contour_width / 10
     contour = Image.fromarray(contour)
@@ -44,6 +70,15 @@ def _draw_contour(wc, img):
 WordCloud._draw_contour = _draw_contour
 
 
+def _numpy_to_svg(contour):
+    svg_elements = []
+    points = np.array(contour.nonzero()).T
+    for y, x in points:
+        svg_elements.append(f'<circle cx="{x}" cy="{y}" r="1" stroke="black" fill="black" />')
+
+    return '\n'.join(svg_elements)
+
+
 def random_color_darker(word=None, font_size=None, position=None, orientation=None, font_path=None, random_state=None):
     """Random color generation func"""
     if random_state is None:
diff --git a/tests/data/visualization/word_mask.png b/tests/data/visualization/word_mask.png
new file mode 100644
index 000000000..e235d063e
Binary files /dev/null and b/tests/data/visualization/word_mask.png differ
diff --git a/tests/models/test_definition_dict.py b/tests/models/test_definition_dict.py
index 357584cc1..5005f55c5 100644
--- a/tests/models/test_definition_dict.py
+++ b/tests/models/test_definition_dict.py
@@ -134,5 +134,15 @@ def test_expand_defs(self):
             hed_string.expand_defs()
             self.assertEqual(str(hed_string), expected_results[key])
 
+    def test_altering_definition_contents(self):
+        def_dict = DefinitionDict("(Definition/DefName, (Event, Action))", self.hed_schema)
+        hed_string1 = HedString("Def/DefName", self.hed_schema, def_dict)
+        hed_string2 = HedString("Def/DefName", self.hed_schema, def_dict)
+        hed_string1.expand_defs()
+        hed_string2.expand_defs()
+        hed_string1.remove([hed_string1.get_all_tags()[2]])
+
+        self.assertNotEqual(hed_string1, hed_string2)
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/tests/tools/visualization/test_tag_word_cloud.py b/tests/tools/visualization/test_tag_word_cloud.py
index 2b515c941..6bb940eec 100644
--- a/tests/tools/visualization/test_tag_word_cloud.py
+++ b/tests/tools/visualization/test_tag_word_cloud.py
@@ -2,12 +2,19 @@
 from wordcloud import WordCloud
 from hed.tools.visualization import tag_word_cloud
 from hed.tools.visualization.tag_word_cloud import load_and_resize_mask
+from hed.tools.visualization.word_cloud_util import generate_contour_svg
+
 import numpy as np
 from PIL import Image, ImageDraw
 import os
 
 
 class TestWordCloudFunctions(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.mask_path = os.path.realpath(os.path.join(os.path.dirname(__file__),
+                                                      '../../data/visualization/word_mask.png'))
+
     def test_convert_summary_to_word_dict(self):
         # Assume we have a valid summary_json
         summary_json = {
@@ -40,6 +47,30 @@ def test_create_wordcloud(self):
         self.assertEqual(wc.width, width)
         self.assertEqual(wc.height, height)
 
+    def test_create_wordcloud_default_params(self):
+        word_dict = {'tag1': 5, 'tag2': 3, 'tag3': 7}
+        wc = tag_word_cloud.create_wordcloud(word_dict)
+
+        self.assertIsInstance(wc, WordCloud)
+        self.assertEqual(wc.width, 400)
+        self.assertEqual(wc.height, 200)
+
+    def test_mask_scaling(self):
+        word_dict = {'tag1': 5, 'tag2': 3, 'tag3': 7}
+        wc = tag_word_cloud.create_wordcloud(word_dict, self.mask_path, width=300, height=300)
+
+        self.assertIsInstance(wc, WordCloud)
+        self.assertEqual(wc.width, 300)
+        self.assertEqual(wc.height, 300)
+
+    def test_mask_scaling2(self):
+        word_dict = {'tag1': 5, 'tag2': 3, 'tag3': 7}
+        wc = tag_word_cloud.create_wordcloud(word_dict, self.mask_path, width=300, height=None)
+
+        self.assertIsInstance(wc, WordCloud)
+        self.assertEqual(wc.width, 300)
+        self.assertLess(wc.height, 300)
+
     def test_create_wordcloud_with_empty_dict(self):
         # Test creation of word cloud with an empty dictionary
         word_dict = {}
@@ -54,6 +85,15 @@ def test_create_wordcloud_with_single_word(self):
         # Check that the single word is in the word cloud
         self.assertIn('single_word', wc.words_)
 
+    def test_valid_word_cloud(self):
+        word_dict = {'tag1': 5, 'tag2': 3, 'tag3': 7}
+        wc = tag_word_cloud.create_wordcloud(word_dict, mask_path=self.mask_path, width=400, height=None)
+        svg_output = tag_word_cloud.word_cloud_to_svg(wc)
+        self.assertTrue(svg_output.startswith('<svg'))
+        self.assertIn("<circle cx=", svg_output)
+        self.assertTrue(svg_output.endswith('</svg>'))
+        self.assertIn('fill:rgb', svg_output)
+
 
 class TestLoadAndResizeMask(unittest.TestCase):
     @classmethod