diff --git a/.gitignore b/.gitignore
index ca8ce49..64d45d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ build/*
 *egg-info/*
 onnxruntime_profile*
 prof
+test*.png
 _doc/sg_execution_times.rst
 _doc/auto_examples/*
 _doc/examples/_cache/*
diff --git a/CHANGELOGS.rst b/CHANGELOGS.rst
index 39aaea9..dad0930 100644
--- a/CHANGELOGS.rst
+++ b/CHANGELOGS.rst
@@ -4,6 +4,7 @@ Change Logs
 0.2.0
 +++++
 
+* :pr:`61`: adds function to plot onnx model as graphs
 * :pr:`60`: supports translation of local functions
 * :pr:`59`: add methods to update nodes in GraphAPI 
 
diff --git a/_unittests/ut_plotting/test_graphviz.py b/_unittests/ut_plotting/test_graphviz.py
new file mode 100644
index 0000000..420779e
--- /dev/null
+++ b/_unittests/ut_plotting/test_graphviz.py
@@ -0,0 +1,51 @@
+import os
+import unittest
+import onnx.parser
+from onnx_array_api.ext_test_case import (
+    ExtTestCase,
+    skipif_ci_windows,
+    skipif_ci_apple,
+)
+from onnx_array_api.plotting.dot_plot import to_dot
+from onnx_array_api.plotting.graphviz_helper import draw_graph_graphviz, plot_dot
+
+
+class TestGraphviz(ExtTestCase):
+    @classmethod
+    def _get_graph(cls):
+        return onnx.parser.parse_model(
+            """
+            <ir_version: 8, opset_import: [ "": 18]>
+            agraph (float[N] x) => (float[N] z) {
+                two = Constant <value_float=2.0> ()
+                four = Add(two, two)
+                z = Mul(x, x)
+            }"""
+        )
+
+    @skipif_ci_windows("graphviz not installed")
+    @skipif_ci_apple("graphviz not installed")
+    def test_draw_graph_graphviz(self):
+        fout = "test_draw_graph_graphviz.png"
+        dot = to_dot(self._get_graph())
+        draw_graph_graphviz(dot, image=fout)
+        self.assertExists(os.path.exists(fout))
+
+    @skipif_ci_windows("graphviz not installed")
+    @skipif_ci_apple("graphviz not installed")
+    def test_draw_graph_graphviz_proto(self):
+        fout = "test_draw_graph_graphviz_proto.png"
+        dot = self._get_graph()
+        draw_graph_graphviz(dot, image=fout)
+        self.assertExists(os.path.exists(fout))
+
+    @skipif_ci_windows("graphviz not installed")
+    @skipif_ci_apple("graphviz not installed")
+    def test_plot_dot(self):
+        dot = to_dot(self._get_graph())
+        ax = plot_dot(dot)
+        ax.get_figure().savefig("test_plot_dot.png")
+
+
+if __name__ == "__main__":
+    unittest.main(verbosity=2)
diff --git a/onnx_array_api/ext_test_case.py b/onnx_array_api/ext_test_case.py
index 1068bda..3c12e65 100644
--- a/onnx_array_api/ext_test_case.py
+++ b/onnx_array_api/ext_test_case.py
@@ -19,6 +19,10 @@ def is_windows() -> bool:
     return sys.platform == "win32"
 
 
+def is_apple() -> bool:
+    return sys.platform == "darwin"
+
+
 def skipif_ci_windows(msg) -> Callable:
     """
     Skips a unit test if it runs on :epkg:`azure pipeline` on :epkg:`Windows`.
@@ -29,6 +33,16 @@ def skipif_ci_windows(msg) -> Callable:
     return lambda x: x
 
 
+def skipif_ci_apple(msg) -> Callable:
+    """
+    Skips a unit test if it runs on :epkg:`azure pipeline` on :epkg:`Windows`.
+    """
+    if is_apple() and is_azure():
+        msg = f"Test does not work on azure pipeline (Apple). {msg}"
+        return unittest.skip(msg)
+    return lambda x: x
+
+
 def ignore_warnings(warns: List[Warning]) -> Callable:
     """
     Catches warnings.
@@ -230,6 +244,10 @@ def assertEmpty(self, value: Any):
             return
         raise AssertionError(f"value is not empty: {value!r}.")
 
+    def assertExists(self, name):
+        if not os.path.exists(name):
+            raise AssertionError(f"File or folder {name!r} does not exists.")
+
     def assertHasAttr(self, cls: type, name: str):
         if not hasattr(cls, name):
             raise AssertionError(f"Class {cls} has no attribute {name!r}.")
diff --git a/onnx_array_api/plotting/graphviz_helper.py b/onnx_array_api/plotting/graphviz_helper.py
new file mode 100644
index 0000000..2dd93c2
--- /dev/null
+++ b/onnx_array_api/plotting/graphviz_helper.py
@@ -0,0 +1,236 @@
+import os
+import subprocess
+import sys
+import tempfile
+from typing import List, Optional, Tuple, Union
+import numpy as np
+from onnx import ModelProto
+
+
+def _find_in_PATH(prog: str) -> Optional[str]:
+    """
+    Looks into every path mentioned in ``%PATH%`` a specific file,
+    it raises an exception if not found.
+
+    :param prog: program to look for
+    :return: path
+    """
+    sep = ";" if sys.platform.startswith("win") else ":"
+    path = os.environ["PATH"]
+    for p in path.split(sep):
+        f = os.path.join(p, prog)
+        if os.path.exists(f):
+            return p
+    return None
+
+
+def _find_graphviz_dot(exc: bool = True) -> str:
+    """
+    Determines the path to graphviz (on Windows),
+    the function tests the existence of versions 34 to 45
+    assuming it was installed in a standard folder:
+    ``C:\\Program Files\\MiKTeX 2.9\\miktex\\bin\\x64``.
+
+    :param exc: raise exception of be silent
+    :return: path to dot
+    :raises FileNotFoundError: if graphviz not found
+    """
+    if sys.platform.startswith("win"):
+        version = list(range(34, 60))
+        version.extend([f"{v}.1" for v in version])
+        for v in version:
+            graphviz_dot = f"C:\\Program Files (x86)\\Graphviz2.{v}\\bin\\dot.exe"
+            if os.path.exists(graphviz_dot):
+                return graphviz_dot
+        extra = ["build/update_modules/Graphviz/bin"]
+        for ext in extra:
+            graphviz_dot = os.path.join(ext, "dot.exe")
+            if os.path.exists(graphviz_dot):
+                return graphviz_dot
+        p = _find_in_PATH("dot.exe")
+        if p is None:
+            if exc:
+                raise FileNotFoundError(
+                    f"Unable to find graphviz, look into paths such as {graphviz_dot}."
+                )
+            return None
+        return os.path.join(p, "dot.exe")
+    # linux
+    return "dot"
+
+
+def _run_subprocess(
+    args: List[str],
+    cwd: Optional[str] = None,
+):
+    assert not isinstance(
+        args, str
+    ), "args should be a sequence of strings, not a string."
+
+    p = subprocess.Popen(
+        args,
+        cwd=cwd,
+        shell=False,
+        env=os.environ,
+        stdout=subprocess.PIPE,
+        stderr=subprocess.STDOUT,
+    )
+    raise_exception = False
+    output = ""
+    while True:
+        output = p.stdout.readline().decode(errors="ignore")
+        if output == "" and p.poll() is not None:
+            break
+        if output:
+            if (
+                "fatal error" in output
+                or "CMake Error" in output
+                or "gmake: ***" in output
+                or "): error C" in output
+                or ": error: " in output
+            ):
+                raise_exception = True
+    p.poll()
+    p.stdout.close()
+    if raise_exception:
+        raise RuntimeError(
+            "An error was found in the output. The build is stopped.\n{output}"
+        )
+    return output
+
+
+def _run_graphviz(filename: str, image: str, engine: str = "dot") -> str:
+    """
+    Run :epkg:`Graphviz`.
+
+    :param filename: filename which contains the graph definition
+    :param image: output image
+    :param engine: *dot* or *neato*
+    :return: output of graphviz
+    """
+    ext = os.path.splitext(image)[-1]
+    assert ext in {
+        ".png",
+        ".bmp",
+        ".fig",
+        ".gif",
+        ".ico",
+        ".jpg",
+        ".jpeg",
+        ".pdf",
+        ".ps",
+        ".svg",
+        ".vrml",
+        ".tif",
+        ".tiff",
+        ".wbmp",
+    }, f"Unexpected extension {ext!r} for {image!r}."
+    if sys.platform.startswith("win"):
+        bin_ = os.path.dirname(_find_graphviz_dot())
+        # if bin not in os.environ["PATH"]:
+        #    os.environ["PATH"] = os.environ["PATH"] + ";" + bin
+        exe = os.path.join(bin_, engine)
+    else:
+        exe = engine
+    if os.path.exists(image):
+        os.remove(image)
+    output = _run_subprocess([exe, f"-T{ext[1:]}", filename, "-o", image])
+    assert os.path.exists(image), f"Graphviz failed due to {output}"
+    return output
+
+
+def draw_graph_graphviz(
+    dot: Union[str, ModelProto],
+    image: str,
+    engine: str = "dot",
+) -> str:
+    """
+    Draws a graph using :epkg:`Graphviz`.
+
+    :param dot: dot graph or ModelProto
+    :param image: output image, None, just returns the output
+    :param engine: *dot* or *neato*
+    :return: :epkg:`Graphviz` output or
+        the dot text if *image* is None
+
+    The function creates a temporary file to store the dot file if *image* is not None.
+    """
+    if isinstance(dot, ModelProto):
+        from .dot_plot import to_dot
+
+        sdot = to_dot(dot)
+    else:
+        sdot = dot
+    with tempfile.NamedTemporaryFile(delete=False) as fp:
+        fp.write(sdot.encode("utf-8"))
+        fp.close()
+
+        filename = fp.name
+        assert os.path.exists(
+            filename
+        ), f"File {filename!r} cannot be created to store the graph."
+        out = _run_graphviz(filename, image, engine=engine)
+        assert os.path.exists(
+            image
+        ), f"Graphviz failed with no reason, {image!r} not found, output is {out}."
+        os.remove(filename)
+        return out
+
+
+def plot_dot(
+    dot: Union[str, ModelProto],
+    ax: Optional["matplotlib.axis.Axis"] = None,  # noqa: F821
+    engine: str = "dot",
+    figsize: Optional[Tuple[int, int]] = None,
+) -> "matplotlib.axis.Axis":  # noqa: F821
+    """
+    Draws a dot graph into a matplotlib graph.
+
+    :param dot: dot graph or ModelProto
+    :param image: output image, None, just returns the output
+    :param engine: *dot* or *neato*
+    :param figsize: figsize of ax is None
+    :return: :epkg:`Graphviz` output or
+        the dot text if *image* is None
+
+    .. plot::
+
+        import matplotlib.pyplot as plt
+        import onnx.parser
+
+        model = onnx.parser.parse_model(
+                    '''
+                    <ir_version: 8, opset_import: [ "": 18]>
+                    agraph (float[N] x) => (float[N] z) {
+                        two = Constant <value_float=2.0> ()
+                        four = Add(two, two)
+                        z = Mul(four, four)
+                    }''')
+        ax = plot_dot(dot)
+        ax.set_title("Dummy graph")
+        plt.show()
+    """
+    if ax is None:
+        import matplotlib.pyplot as plt
+
+        _, ax = plt.subplots(1, 1, figsize=figsize)
+        clean = True
+    else:
+        clean = False
+
+    from PIL import Image
+
+    with tempfile.NamedTemporaryFile(suffix=".png", delete=False) as fp:
+        fp.close()
+
+        draw_graph_graphviz(dot, fp.name, engine=engine)
+        img = np.asarray(Image.open(fp.name))
+        os.remove(fp.name)
+
+        ax.imshow(img)
+
+    if clean:
+        ax.get_xaxis().set_visible(False)
+        ax.get_yaxis().set_visible(False)
+        ax.get_figure().tight_layout()
+    return ax