diff --git a/Tests/test_util.py b/Tests/test_util.py
index b5bfca012..58a8ff4f6 100644
--- a/Tests/test_util.py
+++ b/Tests/test_util.py
@@ -8,7 +8,7 @@ def test_is_path():
     fp = "filename.ext"
 
     # Act
-    it_is = _util.isPath(fp)
+    it_is = _util.is_path(fp)
 
     # Assert
     assert it_is
@@ -21,7 +21,7 @@ def test_path_obj_is_path():
     test_path = Path("filename.ext")
 
     # Act
-    it_is = _util.isPath(test_path)
+    it_is = _util.is_path(test_path)
 
     # Assert
     assert it_is
@@ -33,7 +33,7 @@ def test_is_not_path(tmp_path):
         pass
 
     # Act
-    it_is_not = _util.isPath(fp)
+    it_is_not = _util.is_path(fp)
 
     # Assert
     assert not it_is_not
@@ -44,7 +44,7 @@ def test_is_directory():
     directory = "Tests"
 
     # Act
-    it_is = _util.isDirectory(directory)
+    it_is = _util.is_directory(directory)
 
     # Assert
     assert it_is
@@ -55,7 +55,7 @@ def test_is_not_directory():
     text = "abc"
 
     # Act
-    it_is_not = _util.isDirectory(text)
+    it_is_not = _util.is_directory(text)
 
     # Assert
     assert not it_is_not
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index ab391b9b4..504c57643 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -50,7 +50,7 @@ except ImportError:
 # Use __version__ instead.
 from . import ImageMode, TiffTags, UnidentifiedImageError, __version__, _plugins
 from ._binary import i32le, o32be, o32le
-from ._util import deferred_error, isPath
+from ._util import deferred_error, is_path
 
 
 def __getattr__(name):
@@ -2251,7 +2251,7 @@ class Image:
         if isinstance(fp, Path):
             filename = str(fp)
             open_fp = True
-        elif isPath(fp):
+        elif is_path(fp):
             filename = fp
             open_fp = True
         elif fp == sys.stdout:
@@ -2259,7 +2259,7 @@ class Image:
                 fp = sys.stdout.buffer
             except AttributeError:
                 pass
-        if not filename and hasattr(fp, "name") and isPath(fp.name):
+        if not filename and hasattr(fp, "name") and is_path(fp.name):
             # only set the name for metadata purposes
             filename = fp.name
 
@@ -3065,7 +3065,7 @@ def open(fp, mode="r", formats=None):
     filename = ""
     if isinstance(fp, Path):
         filename = str(fp.resolve())
-    elif isPath(fp):
+    elif is_path(fp):
         filename = fp
 
     if filename:
diff --git a/src/PIL/ImageFile.py b/src/PIL/ImageFile.py
index 34f344f1d..a4e7f625e 100644
--- a/src/PIL/ImageFile.py
+++ b/src/PIL/ImageFile.py
@@ -33,7 +33,7 @@ import struct
 import sys
 
 from . import Image
-from ._util import isPath
+from ._util import is_path
 
 MAXBLOCK = 65536
 
@@ -99,7 +99,7 @@ class ImageFile(Image.Image):
         self.decoderconfig = ()
         self.decodermaxblock = MAXBLOCK
 
-        if isPath(fp):
+        if is_path(fp):
             # filename
             self.fp = open(fp, "rb")
             self.filename = fp
diff --git a/src/PIL/ImageFont.py b/src/PIL/ImageFont.py
index f21b6de71..e9f1ab544 100644
--- a/src/PIL/ImageFont.py
+++ b/src/PIL/ImageFont.py
@@ -33,7 +33,7 @@ from enum import IntEnum
 from io import BytesIO
 
 from . import Image
-from ._util import isDirectory, isPath
+from ._util import is_directory, is_path
 
 
 class Layout(IntEnum):
@@ -212,7 +212,7 @@ class FreeTypeFont:
                 "", size, index, encoding, self.font_bytes, layout_engine
             )
 
-        if isPath(font):
+        if is_path(font):
             if sys.platform == "win32":
                 font_bytes_path = font if isinstance(font, bytes) else font.encode()
                 try:
@@ -877,7 +877,7 @@ def truetype(font=None, size=10, index=0, encoding="", layout_engine=None):
     try:
         return freetype(font)
     except OSError:
-        if not isPath(font):
+        if not is_path(font):
             raise
         ttf_filename = os.path.basename(font)
 
@@ -931,7 +931,7 @@ def load_path(filename):
     :exception OSError: If the file could not be read.
     """
     for directory in sys.path:
-        if isDirectory(directory):
+        if is_directory(directory):
             if not isinstance(filename, str):
                 filename = filename.decode("utf-8")
             try:
diff --git a/src/PIL/ImageQt.py b/src/PIL/ImageQt.py
index db8fa0fa9..c8143d394 100644
--- a/src/PIL/ImageQt.py
+++ b/src/PIL/ImageQt.py
@@ -20,7 +20,7 @@ import sys
 from io import BytesIO
 
 from . import Image
-from ._util import isPath
+from ._util import is_path
 
 qt_versions = [
     ["6", "PyQt6"],
@@ -140,7 +140,7 @@ def _toqclass_helper(im):
     if hasattr(im, "toUtf8"):
         # FIXME - is this really the best way to do this?
         im = str(im.toUtf8(), "utf-8")
-    if isPath(im):
+    if is_path(im):
         im = Image.open(im)
         exclusive_fp = True
 
diff --git a/src/PIL/_util.py b/src/PIL/_util.py
index 0c5d3892e..48d41c752 100644
--- a/src/PIL/_util.py
+++ b/src/PIL/_util.py
@@ -2,13 +2,13 @@ import os
 from pathlib import Path
 
 
-def isPath(f):
+def is_path(f):
     return isinstance(f, (bytes, str, Path))
 
 
-# Checks if an object is a string, and that it points to a directory.
-def isDirectory(f):
-    return isPath(f) and os.path.isdir(f)
+def is_directory(f):
+    """Checks if an object is a string, and that it points to a directory."""
+    return is_path(f) and os.path.isdir(f)
 
 
 class deferred_error: