diff --git a/kvmd/apps/kvmd/api/msd.py b/kvmd/apps/kvmd/api/msd.py
index 16118141..59915864 100644
--- a/kvmd/apps/kvmd/api/msd.py
+++ b/kvmd/apps/kvmd/api/msd.py
@@ -136,7 +136,8 @@ class MsdApi:
 
     @exposed_http("POST", "/msd/write")
     async def __write_handler(self, request: Request) -> Response:
-        name = valid_msd_image_name(request.query.get("image"))
+        unsafe_prefix = request.query.get("prefix", "") + "/"
+        name = valid_msd_image_name(unsafe_prefix + request.query.get("image", ""))
         size = valid_int_f0(request.content_length)
         remove_incomplete = self.__get_remove_incomplete(request)
         written = 0
@@ -151,6 +152,7 @@ class MsdApi:
 
     @exposed_http("POST", "/msd/write_remote")
     async def __write_remote_handler(self, request: Request) -> (Response | StreamResponse):  # pylint: disable=too-many-locals
+        unsafe_prefix = request.query.get("prefix", "") + "/"
         url = valid_url(request.query.get("url"))
         insecure = valid_bool(request.query.get("insecure", False))
         timeout = valid_float_f01(request.query.get("timeout", 10.0))
@@ -175,7 +177,7 @@ class MsdApi:
                 name = str(request.query.get("image", "")).strip()
                 if len(name) == 0:
                     name = htclient.get_filename(remote)
-                name = valid_msd_image_name(name)
+                name = valid_msd_image_name(unsafe_prefix + name)
 
                 size = valid_int_f0(remote.content_length)
 
diff --git a/web/kvm/index.html b/web/kvm/index.html
index 9029fc36..568da0ec 100644
--- a/web/kvm/index.html
+++ b/web/kvm/index.html
@@ -533,6 +533,12 @@
                   <input type="text" id="msd-new-url" style="width: 100%">
                 </td>
               </tr>
+              <tr>
+                <td>Optional upload prefix:</td>
+                <td>
+                  <input type="text" id="msd-new-prefix" style="width: 100%" placeholder="... like /foo/bar">
+                </td>
+              </tr>
             </table>
             <hr>
             <table class="kv">
@@ -544,6 +550,10 @@
                 <td></td>
                 <td>&bull; To speed up the upload, close the stream window.</td>
               </tr>
+              <tr>
+                <td></td>
+                <td>&bull; A non-empty upload prefix will be created when uploading.</td>
+              </tr>
             </table>
           </div>
           <div class="hidden" id="msd-uploading-sub">
diff --git a/web/kvm/navbar-msd.pug b/web/kvm/navbar-msd.pug
index 1ffd763e..f668ae32 100644
--- a/web/kvm/navbar-msd.pug
+++ b/web/kvm/navbar-msd.pug
@@ -71,6 +71,9 @@ li(id="msd-dropdown" class="right feature-disabled")
 				tr
 					td #[b Or] paste a URL:
 					td #[input(type="text" id="msd-new-url" style="width: 100%")]
+				tr
+					td Optional upload prefix:
+					td #[input(type="text" id="msd-new-prefix" style="width: 100%" placeholder="... like /foo/bar")]
 			hr
 			table(class="kv")
 				tr
@@ -79,6 +82,9 @@ li(id="msd-dropdown" class="right feature-disabled")
 				tr
 					td
 					td &bull; To speed up the upload, close the stream window.
+				tr
+					td
+					td &bull; A non-empty upload prefix will be created when uploading.
 		div(id="msd-uploading-sub" class="hidden")
 			hr
 			table(class="kv")
diff --git a/web/share/css/navbar.css b/web/share/css/navbar.css
index a33af82c..5be9ac81 100644
--- a/web/share/css/navbar.css
+++ b/web/share/css/navbar.css
@@ -176,6 +176,16 @@ ul#navbar li div.menu div.buttons select {
 	padding: 0 16px;
 }
 
+ul#navbar li div.menu input[type=text] {
+	height: 1.5em;
+}
+ul#navbar li div.menu input[type=text]::-moz-placeholder {
+	text-align: center;
+}
+ul#navbar li div.menu input[type=text]::-webkit-input-placeholder {
+	text-align: center;
+}
+
 ul#navbar li div.menu hr {
 	margin: 0;
 	display: block;
diff --git a/web/share/js/kvm/msd.js b/web/share/js/kvm/msd.js
index fae72e43..6b8d33b2 100644
--- a/web/share/js/kvm/msd.js
+++ b/web/share/js/kvm/msd.js
@@ -114,11 +114,12 @@ export function Msd() {
 	var __clickUploadNewButton = function() {
 		let file = tools.input.getFile($("msd-new-file"));
 		__http = new XMLHttpRequest();
+		let prefix = encodeURIComponent($("msd-new-prefix").value);
 		if (file) {
-			__http.open("POST", `/api/msd/write?image=${encodeURIComponent(file.name)}&remove_incomplete=1`, true);
+			__http.open("POST", `/api/msd/write?prefix=${prefix}&image=${encodeURIComponent(file.name)}&remove_incomplete=1`, true);
 		} else {
 			let url = $("msd-new-url").value;
-			__http.open("POST", `/api/msd/write_remote?url=${encodeURIComponent(url)}&remove_incomplete=1`, true);
+			__http.open("POST", `/api/msd/write_remote?prefix=${prefix}&url=${encodeURIComponent(url)}&remove_incomplete=1`, true);
 		}
 		__http.upload.timeout = 7 * 24 * 3600;
 		__http.onreadystatechange = __httpStateChange;