diff --git a/nextcloud_favorites_to_osmand_prefixed_groups.py b/nextcloud_favorites_to_osmand_prefixed_groups.py
new file mode 100755
index 0000000..7c084ad
--- /dev/null
+++ b/nextcloud_favorites_to_osmand_prefixed_groups.py
@@ -0,0 +1,127 @@
+#!/usr/bin/env python3
+import json
+import sys
+from datetime import datetime, timezone
+from xml.sax.saxutils import escape
+
+OSMAND_NS = "https://osmand.net"
+
+def epoch_to_iso_z(value):
+    if value is None:
+        return None
+    try:
+        ts = int(value)
+        return datetime.fromtimestamp(ts, tz=timezone.utc).replace(microsecond=0).isoformat().replace("+00:00", "Z")
+    except Exception:
+        return None
+
+def norm(s):
+    if s is None:
+        return None
+    s = str(s).strip()
+    return s if s else None
+
+def main():
+    if len(sys.argv) not in (3, 4):
+        print(
+            "Usage: nextcloud_favorites_to_osmand_prefixed_groups.py .favorites.json out.gpx [prefix]\n"
+            "Example: nextcloud_favorites_to_osmand_prefixed_groups.py .favorites.json favourites.gpx Norwegen",
+            file=sys.stderr
+        )
+        sys.exit(2)
+
+    in_path = sys.argv[1]
+    out_path = sys.argv[2]
+    prefix = sys.argv[3] if len(sys.argv) == 4 else "Norwegen"
+
+    with open(in_path, "r", encoding="utf-8") as f:
+        data = json.load(f)
+
+    if not isinstance(data, dict) or data.get("type") != "FeatureCollection":
+        raise SystemExit("Input is not a GeoJSON FeatureCollection")
+
+    features = data.get("features", [])
+    if not isinstance(features, list):
+        raise SystemExit("GeoJSON 'features' is not a list")
+
+    wpts = []
+    for idx, feat in enumerate(features):
+        if not isinstance(feat, dict) or feat.get("type") != "Feature":
+            continue
+
+        geom = feat.get("geometry") or {}
+        if geom.get("type") != "Point":
+            continue
+
+        coords = geom.get("coordinates")
+        if not (isinstance(coords, list) and len(coords) >= 2):
+            continue
+
+        # GeoJSON order: [lon, lat]
+        try:
+            lon = float(coords[0])
+            lat = float(coords[1])
+        except Exception:
+            continue
+
+        props = feat.get("properties") or {}
+        title = norm(props.get("Title")) or f"Favorite {idx+1}"
+        comment = norm(props.get("Comment"))
+        category = norm(props.get("Category")) or "Uncategorized"
+
+        group = f"{prefix}/{category}"
+
+        # Prefer Updated, else Published (epoch seconds)
+        time_iso = epoch_to_iso_z(props.get("Updated", props.get("Published")))
+
+        wpts.append({
+            "lat": lat,
+            "lon": lon,
+            "name": title,
+            "desc": comment,
+            "time": time_iso,
+            "group": group,
+            "category": category
+        })
+
+    if not wpts:
+        raise SystemExit("No Point features found to convert")
+
+    with open(out_path, "w", encoding="utf-8") as f:
+        f.write('<?xml version="1.0" encoding="UTF-8"?>\n')
+        f.write('<gpx version="1.1" creator="nextcloud_favorites_to_osmand_prefixed_groups.py"\n')
+        f.write('     xmlns="http://www.topografix.com/GPX/1/1"\n')
+        f.write('     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"\n')
+        f.write(f'     xmlns:osmand="{OSMAND_NS}"\n')
+        f.write('     xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">\n')
+
+        f.write('  <metadata>\n')
+        f.write(f'    <time>{datetime.now(timezone.utc).replace(microsecond=0).isoformat().replace("+00:00","Z")}</time>\n')
+        f.write('  </metadata>\n')
+
+        for w in wpts:
+            f.write(f'  <wpt lat="{w["lat"]:.8f}" lon="{w["lon"]:.8f}">\n')
+            f.write(f'    <name>{escape(w["name"])}</name>\n')
+
+            # OsmAnd favorites group name (most important)
+            f.write(f'    <type>{escape(w["group"])}</type>\n')
+
+            if w["desc"] is not None:
+                f.write(f'    <desc>{escape(w["desc"])}</desc>\n')
+            if w["time"] is not None:
+                f.write(f'    <time>{escape(w["time"])}</time>\n')
+
+            # Extra hints (safe if ignored)
+            f.write('    <extensions>\n')
+            f.write(f'      <osmand:category>{escape(w["group"])}</osmand:category>\n')
+            f.write(f'      <osmand:tag k="nextcloud_category" v="{escape(w["category"])}"/>\n')
+            f.write('    </extensions>\n')
+
+            f.write('  </wpt>\n')
+
+        f.write('</gpx>\n')
+
+    print(f"Wrote {len(wpts)} favorites to {out_path} with groups like '{prefix}/<Category>'")
+
+if __name__ == "__main__":
+    main()
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