diff --git a/README.md b/README.md
index 05ede55..45ff373 100644
--- a/README.md
+++ b/README.md
@@ -86,7 +86,7 @@ Visual multi-LoRA loader with a thumbnail grid browser, selected-LoRA panel, and
 
 **SFW toggle:** When enabled, any folder named `NSFW` (case-insensitive) is hidden from browse and search — at any depth in your LoRA library. Turn it off to show those folders again.
 
-**Thumbnails:** place `{lora_name}.png` next to each `.safetensors` file. Right-click a **Preview Image** → **Save as LoRA thumbnail** to save from a generated image (overwrites existing).
+**Thumbnails:** place an image next to each `.safetensors` file using the same base name — `.png`, `.webp`, `.jpg`, or `.jpeg` (`.png` is preferred when multiple exist). Right-click a **Preview Image** → **Save as LoRA thumbnail** to save from a generated image (saved as `.png`, overwrites existing).
 
 **Trigger words:** companion `.txt` file beside the LoRA (same base name). One per line or comma-separated.
 
diff --git a/lora_browser.py b/lora_browser.py
index b9b9d4c..a6eba32 100644
--- a/lora_browser.py
+++ b/lora_browser.py
@@ -10,12 +10,12 @@ import folder_paths
 from .lora_info_service import get_lora_info
 from .nodes.lora_utils import (
     _resolve_lora_full_path,
+    find_lora_preview_path,
     get_lora_triggers,
     lora_has_preview,
     normalize_lora_path,
 )
 
-IMAGE_EXTENSIONS = {".png", ".jpg", ".jpeg", ".webp", ".gif", ".bmp"}
 NSFW_FOLDER_NAME = "nsfw"
 
 
@@ -237,15 +237,7 @@ def _search_loras(relative_path: str, query: str, sfw: bool = True) -> list[dict
 
 def _find_preview_image(lora_relative_path: str) -> str | None:
     full_path = _resolve_lora_path(lora_relative_path)
-    if full_path is None:
-        return None
-
-    base, _ = os.path.splitext(full_path)
-    for ext in IMAGE_EXTENSIONS:
-        candidate = f"{base}{ext}"
-        if os.path.isfile(candidate):
-            return candidate
-    return None
+    return find_lora_preview_path(full_path)
 
 
 def _preview_cache_headers(source_path: str) -> dict[str, str]:
diff --git a/nodes/lora_utils.py b/nodes/lora_utils.py
index 31e9131..e9a3b0d 100644
--- a/nodes/lora_utils.py
+++ b/nodes/lora_utils.py
@@ -219,13 +219,25 @@ def get_lora_by_filename(file_path: str, lora_paths=None) -> str | None:
     return None
 
 
+LORA_PREVIEW_EXTENSIONS = (".png", ".webp", ".jpg", ".jpeg", ".gif", ".bmp")
+
+
+def find_lora_preview_path(full_path: str | None) -> str | None:
+    if not full_path:
+        return None
+
+    base, _ = os.path.splitext(full_path)
+    for ext in LORA_PREVIEW_EXTENSIONS:
+        candidate = f"{base}{ext}"
+        if os.path.isfile(candidate):
+            return candidate
+    return None
+
+
 def lora_has_preview(lora_relative_path: str, *, full_path: str | None = None) -> bool:
     if full_path is None:
         full_path = _resolve_lora_full_path(lora_relative_path)
-    if full_path is None:
-        return False
-    base, _ = os.path.splitext(full_path)
-    return os.path.isfile(f"{base}.png")
+    return find_lora_preview_path(full_path) is not None
 
 
 def get_lora_triggers(lora_relative_path: str = "", *, full_path: str | None = None) -> list[str]: