diff --git a/lerobot/common/robot_devices/robots/koch.py b/lerobot/common/robot_devices/robots/koch.py
index cedbcf0bb..ba1847e0a 100644
--- a/lerobot/common/robot_devices/robots/koch.py
+++ b/lerobot/common/robot_devices/robots/koch.py
@@ -20,7 +20,9 @@
 
 AVAILABLE_ROBOT_TYPES = ["koch", "aloha"]
 
-URL_TEMPLATE = "https://raw.githubusercontent.com/huggingface/lerobot/main/media/{robot}/{arm}_{position}.png"
+URL_TEMPLATE = (
+    "https://raw.githubusercontent.com/huggingface/lerobot/main/media/{robot}/{arm}_{position}.webp"
+)
 
 # In nominal range ]-2048, 2048[
 # First target position consists in moving koch arm to a straight horizontal position with gripper closed.
diff --git a/media/koch/follower_first.png b/media/koch/follower_first.png
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diff --git a/media/koch/follower_rest.png b/media/koch/follower_rest.png
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diff --git a/media/koch/follower_second.png b/media/koch/follower_second.png
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diff --git a/media/koch/leader_first.png b/media/koch/leader_first.png
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diff --git a/media/koch/leader_rest.png b/media/koch/leader_rest.png
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diff --git a/media/koch/leader_second.png b/media/koch/leader_second.png
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