diff --git a/backend/app.ts b/backend/app.ts
index 0147a22..b654582 100644
--- a/backend/app.ts
+++ b/backend/app.ts
@@ -199,11 +199,14 @@ async function handleListFonts(req: Request, res: Response) {
 
 /** GET /api/config — 返回公开配置 */
 async function handleGetConfig(req: Request, res: Response) {
+  const isLlrt = release_name === "llrt";
   return {
     req,
     res: jsonResponse({
       enableTempUpload,
       adminUploadEnabled: !!adminApiKey,
+      /** LLRT 不支持 wasm，无法输出 woff2 */
+      supportedOutTypes: isLlrt ? ["ttf"] : ["woff2", "ttf"],
     }),
   };
 }
diff --git a/package.json b/package.json
index f0b7bc6..60847d2 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "webfont",
   "private": true,
-  "version": "1.3.1",
+  "version": "1.3.2",
   "type": "module",
   "scripts": {
     "dev": "pnpx tsx scripts/dev-all.ts",
diff --git a/src/App.tsx b/src/App.tsx
index 568494c..e9e253b 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -1,6 +1,7 @@
 import { createMemo, createSignal, onMount, Show, For } from "solid-js";
 import { fetchFonts, fetchConfig, type FontInfo, type ServerConfig } from "./api";
 import UploadSection from "./UploadSection";
+import { SelectorRow } from "./FontSelector";
 
 const s = {
   wrap: {
@@ -92,9 +93,11 @@ function App() {
   const [text, set_text] = createSignal("天地无极，乾坤借法");
   const [fonts, set_fonts] = createSignal<FontInfo[]>([]);
   const [selectedFont, set_selectedFont] = createSignal("");
+  const [outType, set_outType] = createSignal<"woff2" | "ttf">("woff2");
   const [serverConfig, set_serverConfig] = createSignal<ServerConfig>({
     enableTempUpload: false,
     adminUploadEnabled: false,
+    supportedOutTypes: ["woff2", "ttf"],
   });
 
   const SLOGAN = "如清风似闪电，超级快的字体子集化裁剪";
@@ -103,6 +106,10 @@ function App() {
     const [fontList, config] = await Promise.all([fetchFonts().catch(() => []), fetchConfig().catch(() => ({ enableTempUpload: false, adminUploadEnabled: false }))]);
     set_fonts(fontList);
     set_serverConfig(config);
+    /** 服务端不支持当前 outType 时自动回退 */
+    if (!config.supportedOutTypes?.includes(outType())) {
+      set_outType(config.supportedOutTypes?.[0] || "ttf");
+    }
     if (fontList.length > 0) {
       /** 标语随机使用一个字体展示 */
       const randomFont = fontList[Math.floor(Math.random() * fontList.length)];
@@ -123,10 +130,11 @@ function App() {
 
   const cssStyle = createMemo(() => {
     const font = selectedFont();
+    const ot = outType();
     if (!font) return "";
     return `@font-face {
   font-family: "CustomFont";
-  src: url("${location.origin}/api?font=${font}&text=${encodeURIComponent(text())}&outType=woff2") format("woff2");
+  src: url("${location.origin}/api?font=${font}&text=${encodeURIComponent(text())}&outType=${ot}") format("${ot}");
 }
 .custom-font {
   color: red;
@@ -189,21 +197,14 @@ function App() {
       <p id="slogan" style={s.desc}>{SLOGAN}</p>
 
       <section style={s.section}>
-        <label style={s.label}>选择字体</label>
-        <select
-          style={s.select}
-          value={selectedFont()}
-          onChange={(e) => onFontChange(e.target.value)}
-        >
-          <option value="">-- 请选择 --</option>
-          <For each={fonts()}>
-            {(f) => (
-              <option value={f.name}>
-                {f.name} ({f.dir})
-              </option>
-            )}
-          </For>
-        </select>
+        <SelectorRow
+          fonts={fonts()}
+          selectedFont={selectedFont()}
+          onFontChange={onFontChange}
+          supportedOutTypes={serverConfig().supportedOutTypes || ["woff2", "ttf"]}
+          outType={outType()}
+          onOutTypeChange={set_outType}
+        />
       </section>
 
       <section style={s.section}>
@@ -228,9 +229,10 @@ function App() {
               <button
                 style={{ ...s.btn, padding: "3px 12px", "font-size": "12px" }}
                 onClick={() => {
+                  const ot = outType();
                   const a = document.createElement("a");
-                  a.href = `/api?font=${selectedFont()}&text=${encodeURIComponent(text())}&outType=woff2`;
-                  a.download = selectedFont().replace(/\.[^.]+$/, "") + "_subset.woff2";
+                  a.href = `/api?font=${selectedFont()}&text=${encodeURIComponent(text())}&outType=${ot}`;
+                  a.download = selectedFont().replace(/\.[^.]+$/, "") + `_subset.${ot}`;
                   a.click();
                 }}
               >
diff --git a/src/FontSelector.tsx b/src/FontSelector.tsx
new file mode 100644
index 0000000..0310874
--- /dev/null
+++ b/src/FontSelector.tsx
@@ -0,0 +1,118 @@
+import { For } from "solid-js";
+
+interface FontSelectorProps {
+  fonts: Array<{ name: string; dir: string }>;
+  selectedFont: string;
+  onFontChange: (font: string) => void;
+}
+
+interface OutTypeSelectorProps {
+  supportedOutTypes: ("woff2" | "ttf")[];
+  outType: "woff2" | "ttf";
+  onOutTypeChange: (type: "woff2" | "ttf") => void;
+}
+
+const outTypeLabels: Record<string, string> = {
+  woff2: "WOFF2 体积更小",
+  ttf: "TTF 速度更快",
+};
+
+const outTypeDescs: Record<string, string> = {
+  woff2: "约压缩 50%，适合生产",
+  ttf: "无编码开销，适合开发",
+};
+
+const s = {
+  wrap: {
+    display: "flex",
+    gap: "12px",
+  } as const,
+  col: {
+    flex: 1,
+  } as const,
+  label: {
+    display: "block",
+    "font-size": "13px",
+    color: "#555",
+    "margin-bottom": "6px",
+  } as const,
+  select: {
+    width: "100%",
+    padding: "8px 12px",
+    "font-size": "14px",
+    border: "1px solid #d9d9d9",
+    "border-radius": "6px",
+    outline: "none",
+    "box-sizing": "border-box",
+    cursor: "pointer",
+    appearance: "none",
+    "background-image": "url(\"data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2 4l4 4 4-4' fill='none' stroke='%23999' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E\")",
+    "background-repeat": "no-repeat",
+    "background-position": "right 10px center",
+    "padding-right": "28px",
+  } as const,
+  desc: {
+    "font-size": "11px",
+    color: "#bbb",
+    "margin-top": "4px",
+  } as const,
+};
+
+export function FontSelector(props: FontSelectorProps) {
+  return (
+    <div style={s.col}>
+      <label style={s.label}>选择字体</label>
+      <select
+        style={s.select}
+        value={props.selectedFont}
+        onChange={(e) => props.onFontChange(e.target.value)}
+      >
+        <option value="">-- 请选择 --</option>
+        <For each={props.fonts}>
+          {(f) => (
+            <option value={f.name}>
+              {f.name}
+            </option>
+          )}
+        </For>
+      </select>
+    </div>
+  );
+}
+
+export function OutTypeSelector(props: OutTypeSelectorProps) {
+  return (
+    <div style={{ width: "160px" }}>
+      <label style={s.label}>输出格式</label>
+      <select
+        style={s.select}
+        value={props.outType}
+        onChange={(e) => props.onOutTypeChange(e.target.value as "woff2" | "ttf")}
+      >
+        <For each={props.supportedOutTypes}>
+          {(t) => (
+            <option value={t}>{outTypeLabels[t]}</option>
+          )}
+        </For>
+      </select>
+      <p style={s.desc}>{outTypeDescs[props.outType]}</p>
+    </div>
+  );
+}
+
+export function SelectorRow(props: FontSelectorProps & OutTypeSelectorProps) {
+  return (
+    <div style={s.wrap}>
+      <FontSelector
+        fonts={props.fonts}
+        selectedFont={props.selectedFont}
+        onFontChange={props.onFontChange}
+      />
+      <OutTypeSelector
+        supportedOutTypes={props.supportedOutTypes}
+        outType={props.outType}
+        onOutTypeChange={props.onOutTypeChange}
+      />
+    </div>
+  );
+}
diff --git a/src/api.ts b/src/api.ts
index e70b5d0..4c7eb42 100644
--- a/src/api.ts
+++ b/src/api.ts
@@ -6,6 +6,7 @@ export interface FontInfo {
 export interface ServerConfig {
   enableTempUpload: boolean;
   adminUploadEnabled: boolean;
+  supportedOutTypes: ("woff2" | "ttf")[];
 }
 
 export interface UploadResult {