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diff --git a/pose_library/conversion.py b/pose_library/conversion.py
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+++ b/pose_library/conversion.py
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+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+"""
+Pose Library - Conversion of old pose libraries.
+"""
+
+from typing import Optional
+from collections.abc import Collection
+
+if "pose_creation" not in locals():
+    from . import pose_creation
+else:
+    import importlib
+
+    pose_creation = importlib.reload(pose_creation)
+
+import bpy
+from bpy.types import (
+    Action,
+    TimelineMarker,
+)
+
+
+def convert_old_poselib(old_poselib: Action) -> Collection[Action]:
+    """Convert an old-style pose library to a set of pose Actions.
+
+    Old pose libraries were one Action with multiple pose markers. Each pose
+    marker will be converted to an Action by itself and marked as asset.
+    """
+
+    pose_assets = [
+        action
+        for marker in old_poselib.pose_markers
+        if (action := convert_old_pose(old_poselib, marker))
+    ]
+
+    # Mark all Actions as assets in one go. Ideally this would be done on an
+    # appropriate frame in the scene (to set up things like the background
+    # colour), but the old-style poselib doesn't contain such information. All
+    # we can do is just render on the current frame.
+    bpy.ops.asset.mark({'selected_ids': pose_assets})
+
+    return pose_assets
+
+
+def convert_old_pose(old_poselib: Action, marker: TimelineMarker) -> Optional[Action]:
+    """Convert an old-style pose library pose to a pose action."""
+
+    frame: int = marker.frame
+    action: Optional[Action] = None
+
+    for fcurve in old_poselib.fcurves:
+        key = pose_creation.find_keyframe(fcurve, frame)
+        if not key:
+            continue
+
+        if action is None:
+            action = bpy.data.actions.new(marker.name)
+
+        pose_creation.create_single_key_fcurve(action, fcurve, key)
+
+    return action