diff --git a/MANIFEST.in b/MANIFEST.in
index b4ee2e95b..b3e17ce6b 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -16,6 +16,7 @@ recursive-include changedetectionio/widgets *
 prune changedetectionio/static/package-lock.json
 prune changedetectionio/static/styles/node_modules
 prune changedetectionio/static/styles/package-lock.json
+include changedetectionio/favicon_utils.py
 include changedetection.py
 include requirements.txt
 include README-pip.md
diff --git a/changedetectionio/favicon_utils.py b/changedetectionio/favicon_utils.py
new file mode 100644
index 000000000..e2274adab
--- /dev/null
+++ b/changedetectionio/favicon_utils.py
@@ -0,0 +1,43 @@
+"""
+Favicon utilities for changedetection.io
+Handles favicon MIME type detection with caching
+"""
+
+from functools import lru_cache
+
+
+@lru_cache(maxsize=1000)
+def get_favicon_mime_type(filepath):
+    """
+    Detect MIME type of favicon by reading file content using puremagic.
+    Results are cached to avoid repeatedly reading the same files.
+
+    Args:
+        filepath: Full path to the favicon file
+
+    Returns:
+        MIME type string (e.g., 'image/png')
+    """
+    mime = None
+
+    try:
+        import puremagic
+        with open(filepath, 'rb') as f:
+            content_bytes = f.read(200)  # Read first 200 bytes
+
+        detections = puremagic.magic_string(content_bytes)
+        if detections:
+            mime = detections[0].mime_type
+    except Exception:
+        pass
+
+    # Fallback to mimetypes if puremagic fails
+    if not mime:
+        import mimetypes
+        mime, _ = mimetypes.guess_type(filepath)
+
+    # Final fallback based on extension
+    if not mime:
+        mime = 'image/x-icon' if filepath.endswith('.ico') else 'image/png'
+
+    return mime