diff --git a/src/uproot/cli.py b/src/uproot/cli.py
index 16c3024..23d6b29 100644
--- a/src/uproot/cli.py
+++ b/src/uproot/cli.py
@@ -124,6 +124,7 @@ def cli() -> None:
 @click.command(help="Run this uproot project")
 @click.option("--host", "-h", default="127.0.0.1", show_default="127.0.0.1", help="Host")
 @click.option("--port", "-p", default=8000, show_default=8000, help="Port")
+@click.option("--no-enter", default=False, is_flag=True, help="Disable form submission via Enter")
 @click.option("--unsafe", default=False, is_flag=True, help="Run without admin authentication")
 @click.option("--public-demo", default=False, is_flag=True, help="Run a public demo (use with --unsafe)")
 @click.pass_context
@@ -132,6 +133,7 @@ def run(
     ctx: click.Context,
     host: str,
     port: int,
+    no_enter: bool,
     unsafe: bool,
     public_demo: bool,
 ) -> None:
@@ -140,6 +142,7 @@ def run(
 
     d.HOST = host
     d.PORT = port
+    d.NO_ENTER = no_enter
     d.UNSAFE = unsafe
     d.PUBLIC_DEMO = public_demo
 
diff --git a/src/uproot/default/Bare.html b/src/uproot/default/Bare.html
index df4b9c5..4738a35 100644
--- a/src/uproot/default/Bare.html
+++ b/src/uproot/default/Bare.html
@@ -237,6 +237,18 @@ <h5 class="modal-title">
 
         uproot.slidersWithoutAnchoring();
 
+        if (ui.no_enter) {
+            // disable Enter for form submission
+
+            document.querySelectorAll("form").forEach((form) => {
+                form.addEventListener("keydown", (e) => {
+                    if (e.key === "Enter" && e.target.tagName !== "TEXTAREA") {
+                        e.preventDefault();
+                    }
+                });
+            });
+        }
+
         // clear selection feature for non-required radios
 
         uproot.nonRequiredRadios();
diff --git a/src/uproot/deployment.py b/src/uproot/deployment.py
index 393031c..4a19741 100644
--- a/src/uproot/deployment.py
+++ b/src/uproot/deployment.py
@@ -37,6 +37,7 @@
 LANGUAGE: ISO639 = "en"
 LOGIN_TOKEN: Optional[str] = None
 LOGGER: Any = logging.getLogger("uproot")
+NO_ENTER: bool = False
 ORIGIN: Optional[str] = os.getenv("UPROOT_ORIGIN")
 
 # Auto-detect Heroku app URL if not explicitly set
diff --git a/src/uproot/pages.py b/src/uproot/pages.py
index e6015c1..2d90e9c 100644
--- a/src/uproot/pages.py
+++ b/src/uproot/pages.py
@@ -209,6 +209,7 @@ async def render(
             sname=sname,
             thisis=thisis,
             uname=uname,
+            no_enter=d.NO_ENTER,
         )
         | (metadata if metadata is not None else {})
     )