diff --git a/WebHostLib/__init__.py b/WebHostLib/__init__.py
index 934cc249..e928b8f3 100644
--- a/WebHostLib/__init__.py
+++ b/WebHostLib/__init__.py
@@ -61,18 +61,26 @@ cache = Cache()
 Compress(app)
 
 
+def to_python(value):
+    return uuid.UUID(bytes=base64.urlsafe_b64decode(value + '=='))
+
+
+def to_url(value):
+    return base64.urlsafe_b64encode(value.bytes).rstrip(b'=').decode('ascii')
+
+
 class B64UUIDConverter(BaseConverter):
 
     def to_python(self, value):
-        return uuid.UUID(bytes=base64.urlsafe_b64decode(value + '=='))
+        return to_python(value)
 
     def to_url(self, value):
-        return base64.urlsafe_b64encode(value.bytes).rstrip(b'=').decode('ascii')
+        return to_url(value)
 
 
 # short UUID
 app.url_map.converters["suuid"] = B64UUIDConverter
-app.jinja_env.filters['suuid'] = lambda value: base64.urlsafe_b64encode(value.bytes).rstrip(b'=').decode('ascii')
+app.jinja_env.filters["suuid"] = to_url
 app.jinja_env.filters["title_sorted"] = title_sorted
 
 
diff --git a/WebHostLib/api/room.py b/WebHostLib/api/room.py
index 93379756..78623bbe 100644
--- a/WebHostLib/api/room.py
+++ b/WebHostLib/api/room.py
@@ -3,6 +3,7 @@ from uuid import UUID
 
 from flask import abort, url_for
 
+from WebHostLib import to_url
 import worlds.Files
 from . import api_endpoints, get_players
 from ..models import Room
@@ -33,7 +34,7 @@ def room_info(room_id: UUID) -> Dict[str, Any]:
             downloads.append(slot_download)
 
     return {
-        "tracker": room.tracker,
+        "tracker": to_url(room.tracker),
         "players": get_players(room.seed),
         "last_port": room.last_port,
         "last_activity": room.last_activity,
diff --git a/WebHostLib/api/user.py b/WebHostLib/api/user.py
index 2524cc40..59c8e572 100644
--- a/WebHostLib/api/user.py
+++ b/WebHostLib/api/user.py
@@ -1,6 +1,7 @@
 from flask import session, jsonify
 from pony.orm import select
 
+from WebHostLib import to_url
 from WebHostLib.models import Room, Seed
 from . import api_endpoints, get_players
 
@@ -10,13 +11,13 @@ def get_rooms():
     response = []
     for room in select(room for room in Room if room.owner == session["_id"]):
         response.append({
-            "room_id": room.id,
-            "seed_id": room.seed.id,
+            "room_id": to_url(room.id),
+            "seed_id": to_url(room.seed.id),
             "creation_time": room.creation_time,
             "last_activity": room.last_activity,
             "last_port": room.last_port,
             "timeout": room.timeout,
-            "tracker": room.tracker,
+            "tracker": to_url(room.tracker),
         })
     return jsonify(response)
 
@@ -26,7 +27,7 @@ def get_seeds():
     response = []
     for seed in select(seed for seed in Seed if seed.owner == session["_id"]):
         response.append({
-            "seed_id": seed.id,
+            "seed_id": to_url(seed.id),
             "creation_time": seed.creation_time,
             "players": get_players(seed),
         })
diff --git a/test/hosting/webhost.py b/test/hosting/webhost.py
index 4db605e8..8888c3fb 100644
--- a/test/hosting/webhost.py
+++ b/test/hosting/webhost.py
@@ -2,6 +2,8 @@ import re
 from pathlib import Path
 from typing import TYPE_CHECKING, Optional, cast
 
+from WebHostLib import to_python
+
 if TYPE_CHECKING:
     from flask import Flask
     from werkzeug.test import Client as FlaskClient
@@ -103,7 +105,7 @@ def stop_room(app_client: "FlaskClient",
     poll_interval = 2
 
     print(f"Stopping room {room_id}")
-    room_uuid = app.url_map.converters["suuid"].to_python(None, room_id)  # type: ignore[arg-type]
+    room_uuid = to_python(room_id)
 
     if timeout is not None:
         sleep(.1)  # should not be required, but other things might use threading
@@ -156,7 +158,7 @@ def set_room_timeout(room_id: str, timeout: float) -> None:
     from WebHostLib.models import Room
     from WebHostLib import app
 
-    room_uuid = app.url_map.converters["suuid"].to_python(None, room_id)  # type: ignore[arg-type]
+    room_uuid = to_python(room_id)
     with db_session:
         room: Room = Room.get(id=room_uuid)
         room.timeout = timeout
@@ -168,7 +170,7 @@ def get_multidata_for_room(webhost_client: "FlaskClient", room_id: str) -> bytes
     from WebHostLib.models import Room
     from WebHostLib import app
 
-    room_uuid = app.url_map.converters["suuid"].to_python(None, room_id)  # type: ignore[arg-type]
+    room_uuid = to_python(room_id)
     with db_session:
         room: Room = Room.get(id=room_uuid)
         return cast(bytes, room.seed.multidata)
@@ -180,7 +182,7 @@ def set_multidata_for_room(webhost_client: "FlaskClient", room_id: str, data: by
     from WebHostLib.models import Room
     from WebHostLib import app
 
-    room_uuid = app.url_map.converters["suuid"].to_python(None, room_id)  # type: ignore[arg-type]
+    room_uuid = to_python(room_id)
     with db_session:
         room: Room = Room.get(id=room_uuid)
         room.seed.multidata = data