diff --git a/crates/rkvm-web/Cargo.toml b/crates/rkvm-web/Cargo.toml
index 330c147..51bccb1 100644
--- a/crates/rkvm-web/Cargo.toml
+++ b/crates/rkvm-web/Cargo.toml
@@ -67,6 +67,8 @@ web-sys = { version = "0.3", features = [
     "HtmlSelectElement",
     "HtmlCanvasElement",
     "CanvasRenderingContext2d",
+    "Navigator",
+    "Node",
 ] }
 
 [profile.release]
diff --git a/crates/rkvm-web/index.html b/crates/rkvm-web/index.html
index 2910191..695fc41 100644
--- a/crates/rkvm-web/index.html
+++ b/crates/rkvm-web/index.html
@@ -67,6 +67,7 @@
       .card button:not(:disabled):hover { background: var(--accent-hover); }
       .card button:not(:disabled):active { transform: translateY(1px); }
       .card button:disabled { opacity: .65; cursor: progress; }
+      .card .row { display: flex; gap: 8px; }
       .err { color: var(--danger); margin-top: 10px; min-height: 1em; font-size: 12.5px; }
 
       .tb-handle { position: fixed; top: 0; left: 50%; transform: translateX(-50%); z-index: 31;
@@ -81,12 +82,16 @@
         transition: transform .22s cubic-bezier(.2,.8,.2,1), opacity .18s; opacity: 0; z-index: 32;
         display: flex; align-items: center; gap: 8px; padding: 7px 10px;
         border-radius: 14px; background: rgba(18, 21, 28, 0.82); border: 1px solid var(--border);
-        font-size: 12px; backdrop-filter: blur(16px) saturate(1.4); box-shadow: var(--shadow); }
+        font-size: 12px; backdrop-filter: blur(16px) saturate(1.4); box-shadow: var(--shadow);
+        max-width: calc(100vw - 16px); box-sizing: border-box; flex-wrap: wrap;
+        justify-content: center; row-gap: 4px; }
       .toolbar.open { transform: translateX(-50%) translateY(0); opacity: 1; }
       .toolbar button { display: inline-flex; align-items: center; justify-content: center;
         min-width: 30px; height: 28px; padding: 0 10px; border: 1px solid transparent;
         border-radius: var(--r1); background: transparent; color: var(--text); cursor: pointer;
-        font: 500 12px var(--font); transition: background .12s, border-color .12s, color .12s, transform .05s; }
+        font: 500 12px var(--font); white-space: nowrap;
+        transition: background .12s, border-color .12s, color .12s, transform .05s; }
+      .toolbar button:disabled { opacity: .4; cursor: default; }
       .toolbar button:hover { background: var(--surface-3); }
       .toolbar button:active { transform: translateY(1px); }
       .toolbar button.active { background: var(--accent); border-color: var(--accent); color: #fff; }
@@ -103,12 +108,15 @@
       .tb-leds span.on { color: #07120c; background: var(--success); border-color: var(--success);
         box-shadow: 0 0 10px -1px var(--success); }
       .tb-err { color: var(--danger); max-width: 220px; overflow: hidden; text-overflow: ellipsis;
-        white-space: nowrap; }
+        white-space: nowrap; cursor: pointer; }
+      .tb-err:empty { display: none; }
 
       .nopw-banner { position: fixed; top: 8px; left: 8px; z-index: 30; max-width: min(460px, calc(100vw - 16px));
         display: flex; align-items: flex-start; gap: 8px; padding: 8px 10px; border-radius: var(--r1);
         background: rgba(120, 22, 32, 0.92); border: 1px solid var(--danger); color: #fff;
         font: 500 12.5px/1.4 var(--font); box-shadow: var(--shadow); }
+      /* The open toolbar sits at the top; move the warning out of its way. */
+      .nopw-banner.low { top: auto; bottom: 8px; }
       .nopw-banner button { flex: none; background: none; border: 0; color: #fff; cursor: pointer;
         font-size: 12px; padding: 0 2px; opacity: .8; }
       .nopw-banner button:hover { opacity: 1; }
diff --git a/crates/rkvm-web/src/app.rs b/crates/rkvm-web/src/app.rs
index 1af1be5..b3fdd18 100644
--- a/crates/rkvm-web/src/app.rs
+++ b/crates/rkvm-web/src/app.rs
@@ -213,7 +213,11 @@ pub fn App() -> impl IntoView {
 
     let adjust_quality = move |delta: f64| {
         let Some(client) = rpc_store.get_value() else { return };
-        let target = (quality.get_untracked() + delta).clamp(0.1, 1.0);
+        let current = quality.get_untracked();
+        let target = ((current + delta).clamp(0.1, 1.0) * 10.0).round() / 10.0;
+        if (target - current).abs() < 0.01 {
+            return;
+        }
         spawn_local(async move {
             match client.call("setStreamQualityFactor", json!({ "factor": target })).await {
                 Ok(_) => quality.set(target),
@@ -272,11 +276,11 @@ pub fn App() -> impl IntoView {
     };
 
     let go_fullscreen = move |_| {
-        if let Some(el) =
-            web_sys::window().and_then(|w| w.document()).and_then(|d| d.document_element())
-        {
-            let _ = el.request_fullscreen();
-        }
+        spawn_local(async move {
+            if let Err(e) = crate::util::toggle_fullscreen().await {
+                error.set(Some(e));
+            }
+        });
     };
 
     let do_ocr = move |_| {
@@ -290,6 +294,34 @@ pub fn App() -> impl IntoView {
         });
     };
 
+    let ocr_copy_msg = RwSignal::new(String::new());
+    let copy_ocr = move |_| {
+        let text = ocr_text.get_untracked().unwrap_or_default();
+        spawn_local(async move {
+            ocr_copy_msg.set(match crate::util::copy_text(&text).await {
+                Ok(()) => "Copied".to_string(),
+                Err(e) => e,
+            });
+        });
+    };
+
+    // Toolbar errors are transient: clear each one after a few seconds unless a
+    // newer error replaced it. Errors shown on the Connect card stay put.
+    let error_timer = StoredValue::new_local(None::<Timeout>);
+    Effect::new(move |_| {
+        let Some(msg) = error.get() else { return };
+        if conn_state.get_untracked() != "connected" {
+            return;
+        }
+        error_timer.set_value(Some(Timeout::new(6000, move || {
+            if error.get_untracked().as_deref() == Some(msg.as_str())
+                && conn_state.get_untracked() == "connected"
+            {
+                error.set(None);
+            }
+        })));
+    });
+
     let hide_timer = StoredValue::new_local(None::<Timeout>);
     let cancel_hide = move |_| hide_timer.set_value(None);
     let schedule_hide = move |_| {
@@ -344,9 +376,21 @@ pub fn App() -> impl IntoView {
                     {move || if mouse_relative.get() { "Mouse: Rel" } else { "Mouse: Abs" }}
                 </button>
                 <span class="tb-group">
-                    <button on:click=quality_down title="Lower stream quality">"−"</button>
+                    <button
+                        on:click=quality_down
+                        disabled=move || quality.get() <= 0.15
+                        title="Lower stream quality"
+                    >
+                        "−"
+                    </button>
                     <span class="tb-stat">{move || format!("{:.0}%", quality.get() * 100.0)}</span>
-                    <button on:click=quality_up title="Raise stream quality">"+"</button>
+                    <button
+                        on:click=quality_up
+                        disabled=move || quality.get() >= 0.95
+                        title="Raise stream quality"
+                    >
+                        "+"
+                    </button>
                 </span>
                 <button class:active=move || audio_on.get() on:click=toggle_audio title="Toggle device audio">
                     {move || if audio_on.get() { "Audio: on" } else { "Audio: off" }}
@@ -363,11 +407,17 @@ pub fn App() -> impl IntoView {
                 <span class="tb-sep"></span>
 
                 <button class="tb-danger" on:click=do_reboot title="Reboot device">"⏻"</button>
-                <span class="tb-err">{move || error.get().unwrap_or_default()}</span>
+                <span
+                    class="tb-err"
+                    title=move || error.get().unwrap_or_default()
+                    on:click=move |_| error.set(None)
+                >
+                    {move || error.get().unwrap_or_default()}
+                </span>
             </div>
 
             <Show when=move || no_password.get() && !nopw_dismissed.get()>
-                <div class="nopw-banner" role="alert">
+                <div class="nopw-banner" class:low=move || toolbar_open.get() role="alert">
                     <span>
                         "⚠ No password set: anyone on this network can control this machine and open a root shell on the device. Set one in ⚙ Settings → Password."
                     </span>
@@ -390,7 +440,14 @@ pub fn App() -> impl IntoView {
                         <textarea rows="10" readonly=true prop:value=move || {
                             ocr_text.get().unwrap_or_default()
                         }></textarea>
-                        <button on:click=move |_| ocr_text.set(None)>"Close"</button>
+                        <div class="row">
+                            <button on:click=copy_ocr>"Copy"</button>
+                            <button on:click=move |_| {
+                                ocr_copy_msg.set(String::new());
+                                ocr_text.set(None);
+                            }>"Close"</button>
+                        </div>
+                        <div class="muted">{move || ocr_copy_msg.get()}</div>
                     </div>
                 </div>
             </Show>
diff --git a/crates/rkvm-web/src/util.rs b/crates/rkvm-web/src/util.rs
index 9fbd47c..733e855 100644
--- a/crates/rkvm-web/src/util.rs
+++ b/crates/rkvm-web/src/util.rs
@@ -1,8 +1,12 @@
 use std::rc::Rc;
 
+use js_sys::{Array, Function, Promise, Reflect};
 use leptos::prelude::*;
 use leptos::task::spawn_local;
 use serde_json::Value;
+use wasm_bindgen::{JsCast, JsValue};
+use wasm_bindgen_futures::JsFuture;
+use web_sys::HtmlTextAreaElement;
 
 use crate::rpc::RpcClient;
 
@@ -29,3 +33,75 @@ pub fn json_string_list(v: &Value) -> Vec<String> {
         .map(|a| a.iter().filter_map(Value::as_str).map(str::to_string).collect())
         .unwrap_or_default()
 }
+
+fn call_method(target: &JsValue, name: &str, args: &Array) -> Result<JsValue, JsValue> {
+    let f = Reflect::get(target, &JsValue::from_str(name))?.dyn_into::<Function>()?;
+    f.apply(target, args)
+}
+
+fn js_message(e: &JsValue) -> String {
+    e.dyn_ref::<js_sys::Error>()
+        .map(|e| String::from(e.message()))
+        .or_else(|| e.as_string())
+        .unwrap_or_else(|| format!("{e:?}"))
+}
+
+/// Toggles page fullscreen. `requestFullscreen` returns a promise that
+/// browsers reject (permissions, iframes, missing user gesture); surface that
+/// instead of leaving an unhandled rejection.
+pub async fn toggle_fullscreen() -> Result<(), String> {
+    let doc = web_sys::window().and_then(|w| w.document()).ok_or("no document")?;
+    let doc_js: &JsValue = doc.as_ref();
+    let active = Reflect::get(doc_js, &JsValue::from_str("fullscreenElement"))
+        .map(|v| !v.is_null() && !v.is_undefined())
+        .unwrap_or(false);
+    let result = if active {
+        call_method(doc_js, "exitFullscreen", &Array::new())
+    } else {
+        let el = doc.document_element().ok_or("no document element")?;
+        call_method(el.as_ref(), "requestFullscreen", &Array::new())
+    };
+    let value = result.map_err(|e| format!("Fullscreen unavailable: {}", js_message(&e)))?;
+    if let Ok(promise) = value.dyn_into::<Promise>() {
+        JsFuture::from(promise)
+            .await
+            .map_err(|e| format!("Fullscreen blocked by the browser: {}", js_message(&e)))?;
+    }
+    Ok(())
+}
+
+/// Copies text to the clipboard. The async Clipboard API only exists in secure
+/// contexts, and the device is usually opened over plain http, so fall back to
+/// a temporary textarea and `execCommand("copy")`.
+pub async fn copy_text(text: &str) -> Result<(), String> {
+    let window = web_sys::window().ok_or("no window")?;
+    let clipboard = Reflect::get(window.navigator().as_ref(), &JsValue::from_str("clipboard"))
+        .unwrap_or(JsValue::UNDEFINED);
+    if clipboard.is_object()
+        && let Ok(p) = call_method(&clipboard, "writeText", &Array::of1(&JsValue::from_str(text)))
+        && let Ok(promise) = p.dyn_into::<Promise>()
+        && JsFuture::from(promise).await.is_ok()
+    {
+        return Ok(());
+    }
+    let doc = window.document().ok_or("no document")?;
+    let body = doc.body().ok_or("no body")?;
+    let area = doc
+        .create_element("textarea")
+        .map_err(|e| js_message(&e))?
+        .dyn_into::<HtmlTextAreaElement>()
+        .map_err(|_| "textarea cast failed")?;
+    area.set_value(text);
+    area.set_attribute("style", "position:fixed;opacity:0").map_err(|e| js_message(&e))?;
+    body.append_child(&area).map_err(|e| js_message(&e))?;
+    area.select();
+    let copied = call_method(doc.as_ref(), "execCommand", &Array::of1(&JsValue::from_str("copy")))
+        .map(|v| v.as_bool().unwrap_or(false))
+        .unwrap_or(false);
+    area.remove();
+    if copied {
+        Ok(())
+    } else {
+        Err("Copy failed: select the text and copy it manually".to_string())
+    }
+}