diff --git a/cookieplone/filters/__init__.py b/cookieplone/filters/__init__.py
index 5ba5093..a5f6454 100644
--- a/cookieplone/filters/__init__.py
+++ b/cookieplone/filters/__init__.py
@@ -106,3 +106,9 @@ def locales_language_code(code: str) -> str:
 def image_prefix(registry: str) -> str:
     """Return the a prefix to be used with all Docker images."""
     return containers.image_prefix(registry)
+
+
+@simple_filter
+def image_separator(registry: str) -> str:
+    """ return the separator to be used for Docker images"""
+    return containers.image_separator(registry)
diff --git a/cookieplone/utils/containers.py b/cookieplone/utils/containers.py
index 4168deb..fac5e15 100644
--- a/cookieplone/utils/containers.py
+++ b/cookieplone/utils/containers.py
@@ -2,8 +2,13 @@
 #
 # SPDX-License-Identifier: MIT
 REGISTRIES = {"docker_hub": "", "github": "ghcr.io/", "gitlab": "registry.gitlab.com/"}
+SEPARATORS = {"docker_hub": "-", "github": "-", "gitlab": "/"}
 
 
 def image_prefix(registry: str) -> str:
     """Return the image prefix to be used based on the registry used."""
     return REGISTRIES.get(registry, "")
+
+def image_separator(registry: str) -> str:
+    """ Return the image separator to be used based on the registry used. """
+    return SEPARATORS.get(registry, "-")