diff --git a/libretranslate/app.py b/libretranslate/app.py
index af78b88..26dc85b 100644
--- a/libretranslate/app.py
+++ b/libretranslate/app.py
@@ -8,8 +8,8 @@ from timeit import default_timer
 
 import argostranslatefiles
 from argostranslatefiles import get_supported_formats
-from flask import (Flask, abort, jsonify, render_template, request, send_file,
-                   url_for, Response)
+from flask import (abort, Blueprint, Flask, jsonify, render_template, request,
+                   Response, send_file, url_for)
 from flask_swagger import swagger
 from flask_swagger_ui import get_swaggerui_blueprint
 from translatehtml import translate_html
@@ -106,10 +106,7 @@ def create_app(args):
 
     from libretranslate.language import load_languages
 
-    app = Flask(__name__)
-
-    if args.debug:
-        app.config["TEMPLATES_AUTO_RELOAD"] = True
+    bp = Blueprint('Main app', __name__)
 
     if not args.disable_files_translation:
         remove_translated_files.setup(get_upload_dir())
@@ -161,7 +158,7 @@ def create_app(args):
         from flask_limiter import Limiter
 
         limiter = Limiter(
-            app,
+            bp,
             key_func=get_remote_address,
             default_limits=get_routes_limits(
                 args.req_limit, args.daily_req_limit, api_keys_db
@@ -181,7 +178,7 @@ def create_app(args):
     if args.metrics:
       from prometheus_client import CONTENT_TYPE_LATEST, Summary, Gauge, CollectorRegistry, multiprocess, generate_latest
 
-      @app.route("/metrics")
+      @bp.route("/metrics")
       @limiter.exempt
       def prometheus_metrics():
         if args.metrics_auth_token:
@@ -252,24 +249,24 @@ def create_app(args):
         else:
           return func
     
-    @app.errorhandler(400)
+    @bp.errorhandler(400)
     def invalid_api(e):
         return jsonify({"error": str(e.description)}), 400
 
-    @app.errorhandler(500)
+    @bp.errorhandler(500)
     def server_error(e):
         return jsonify({"error": str(e.description)}), 500
 
-    @app.errorhandler(429)
+    @bp.errorhandler(429)
     def slow_down_error(e):
         flood.report(get_remote_address())
         return jsonify({"error": "Slowdown: " + str(e.description)}), 429
 
-    @app.errorhandler(403)
+    @bp.errorhandler(403)
     def denied(e):
         return jsonify({"error": str(e.description)}), 403
 
-    @app.route("/")
+    @bp.route("/")
     @limiter.exempt
     def index():
         if args.disable_web_ui:
@@ -285,7 +282,7 @@ def create_app(args):
             version=get_version()
         )
 
-    @app.get("/javascript-licenses")
+    @bp.get("/javascript-licenses")
     @limiter.exempt
     def javascript_licenses():
         if args.disable_web_ui:
@@ -293,7 +290,7 @@ def create_app(args):
 
         return render_template("javascript-licenses.html")
 
-    @app.get("/languages")
+    @bp.get("/languages")
     @limiter.exempt
     def langs():
         """
@@ -325,7 +322,7 @@ def create_app(args):
         return jsonify([{"code": l.code, "name": l.name, "targets": language_pairs.get(l.code, [])} for l in languages])
 
     # Add cors
-    @app.after_request
+    @bp.after_request
     def after_request(response):
         response.headers.add("Access-Control-Allow-Origin", "*")
         response.headers.add(
@@ -337,7 +334,7 @@ def create_app(args):
         response.headers.add("Access-Control-Max-Age", 60 * 60 * 24 * 20)
         return response
 
-    @app.post("/translate")
+    @bp.post("/translate")
     @access_check
     def translate():
         """
@@ -577,7 +574,7 @@ def create_app(args):
         except Exception as e:
             abort(500, description="Cannot translate text: %s" % str(e))
 
-    @app.post("/translate_file")
+    @bp.post("/translate_file")
     @access_check
     def translate_file():
         """
@@ -710,7 +707,7 @@ def create_app(args):
         except Exception as e:
             abort(500, description=e)
 
-    @app.get("/download_file/<string:filename>")
+    @bp.get("/download_file/<string:filename>")
     def download_file(filename: str):
         """
         Download a translated file
@@ -737,7 +734,7 @@ def create_app(args):
 
         return send_file(return_data, as_attachment=True, download_name=download_filename)
 
-    @app.post("/detect")
+    @bp.post("/detect")
     @access_check
     def detect():
         """
@@ -831,7 +828,7 @@ def create_app(args):
 
         return jsonify(detect_languages(q))
 
-    @app.route("/frontend/settings")
+    @bp.route("/frontend/settings")
     @limiter.exempt
     def frontend_settings():
         """
@@ -910,7 +907,7 @@ def create_app(args):
             }
         )
 
-    @app.post("/suggest")
+    @bp.post("/suggest")
     @access_check
     def suggest():
         """
@@ -987,6 +984,14 @@ def create_app(args):
         SuggestionsDatabase().add(q, s, source_lang, target_lang)
         return jsonify({"success": True})
 
+    app = Flask(__name__)
+    if args.debug:
+        app.config["TEMPLATES_AUTO_RELOAD"] = True
+    if args.url_prefix:
+        app.register_blueprint(bp, url_prefix=args.url_prefix)
+    else:
+        app.register_blueprint(bp)
+
     swag = swagger(app)
     swag["info"]["version"] = "1.3.1"
     swag["info"]["title"] = "LibreTranslate"
@@ -1001,7 +1006,9 @@ def create_app(args):
 
     # Call factory function to create our blueprint
     swaggerui_blueprint = get_swaggerui_blueprint(SWAGGER_URL, API_URL)
-
-    app.register_blueprint(swaggerui_blueprint)
+    if args.url_prefix:
+        app.register_blueprint(swaggerui_blueprint, url_prefix=args.url_prefix)
+    else:
+        app.register_blueprint(swaggerui_blueprint)
 
     return app
diff --git a/libretranslate/default_values.py b/libretranslate/default_values.py
index a36f966..c066cbb 100644
--- a/libretranslate/default_values.py
+++ b/libretranslate/default_values.py
@@ -171,6 +171,11 @@ _default_options_objects = [
         'default_value': '',
         'value_type': 'str'
     },
+    {
+        'name': 'URL_PREFIX',
+        'default_value': '',
+        'value_type': 'str'
+    },
 ]
 
 
diff --git a/libretranslate/main.py b/libretranslate/main.py
index 27827ae..aa6aabf 100644
--- a/libretranslate/main.py
+++ b/libretranslate/main.py
@@ -159,14 +159,23 @@ def get_args():
         type=str,
         help="Protect the /metrics endpoint by allowing only clients that have a valid Authorization Bearer token (%(default)s)",
     )
-    return parser.parse_args()
+    parser.add_argument(
+        "--url-prefix",
+        default=DEFARGS['URL_PREFIX'],
+        type=str,
+        help="Add prefix to URL: example.com:5000/url-prefix/",
+    )
+    args = parser.parse_args()
+    if args.url_prefix and not args.url_prefix.startswith('/'):
+        args.url_prefix = '/' + args.url_prefix
+    return args
 
 
 def main():
     args = get_args()
     app = create_app(args)
 
-    if sys.argv[0] == '--wsgi':
+    if '--wsgi' in sys.argv:
         return app
     else:
         if args.debug:
@@ -175,7 +184,7 @@ def main():
             from waitress import serve
 
             url_scheme = "https" if args.ssl else "http"
-            print("Running on %s://%s:%s" % (url_scheme, args.host, args.port))
+            print("Running on %s://%s:%s%s" % (url_scheme, args.host, args.port, args.url_prefix))
 
             serve(
                 app,
diff --git a/libretranslate/static/js/app.js b/libretranslate/static/js/app.js
index 34740e5..3e9129d 100644
--- a/libretranslate/static/js/app.js
+++ b/libretranslate/static/js/app.js
@@ -1,6 +1,7 @@
 // @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-3.0
 // API host/endpoint
-var BaseUrl = window.location.protocol + "//" + window.location.host;
+//var BaseUrl = window.location.protocol + "//" + window.location.host + window.location.pathname.length > 1 ? window.location.pathname : "" ;
+var BaseUrl = window.location.href.slice(0, -1)
 var htmlRegex = /<(.*)>.*?|<(.*)\/>/;
 document.addEventListener('DOMContentLoaded', function(){
     var sidenavElems = document.querySelectorAll('.sidenav');