diff --git a/astrbot/core/utils/t2i/network_strategy.py b/astrbot/core/utils/t2i/network_strategy.py
index 5f9385614f..4fec121953 100644
--- a/astrbot/core/utils/t2i/network_strategy.py
+++ b/astrbot/core/utils/t2i/network_strategy.py
@@ -1,7 +1,7 @@
 import asyncio
-import base64
 import logging
 import random
+import re
 from functools import lru_cache
 from pathlib import Path
 
@@ -15,6 +15,11 @@
 from . import RenderStrategy
 
 ASTRBOT_T2I_DEFAULT_ENDPOINT = "https://t2i.soulter.top/text2img"
+SHIKI_RUNTIME_SCRIPT_ID = "astrbot-t2i-shiki-runtime"
+SHIKI_RUNTIME_TEMPLATE_PATTERN = re.compile(r"\{\{\s*shiki_runtime\s*\|\s*safe\s*\}\}")
+JINJA_SYNTAX_PATTERN = re.compile(r"\{[{%#]")
+JINJA_RAW_OPEN_PATTERN = re.compile(r"{%-?\s*raw\s*-?%}")
+JINJA_RAW_CLOSE_PATTERN = re.compile(r"{%-?\s*endraw\s*-?%}")
 
 logger = logging.getLogger("astrbot")
 
@@ -41,7 +46,49 @@ def get_shiki_runtime() -> str:
         )
         return ""
 
-    return runtime.replace("</script", "<\\/script")
+    return re.sub(r"</(script)", r"<\/\1", runtime, flags=re.IGNORECASE)
+
+
+def _is_inside_jinja_raw_block(tmpl_str: str, index: int) -> bool:
+    raw_open_index = -1
+    for match in JINJA_RAW_OPEN_PATTERN.finditer(tmpl_str, 0, index):
+        raw_open_index = match.start()
+
+    raw_close_index = -1
+    for match in JINJA_RAW_CLOSE_PATTERN.finditer(tmpl_str, 0, index):
+        raw_close_index = match.start()
+
+    return raw_open_index > raw_close_index
+
+
+def _wrap_runtime_for_jinja(tmpl_str: str, script: str, index: int) -> str:
+    if not JINJA_SYNTAX_PATTERN.search(script) or _is_inside_jinja_raw_block(
+        tmpl_str,
+        index,
+    ):
+        return script
+
+    return f"{{% raw %}}{script}{{% endraw %}}"
+
+
+def inject_shiki_runtime(tmpl_str: str) -> str:
+    if SHIKI_RUNTIME_SCRIPT_ID in tmpl_str or SHIKI_RUNTIME_TEMPLATE_PATTERN.search(
+        tmpl_str,
+    ):
+        return tmpl_str
+
+    runtime = get_shiki_runtime()
+    if not runtime:
+        return tmpl_str
+
+    script = f'<script id="{SHIKI_RUNTIME_SCRIPT_ID}">{runtime}</script>'
+    head_close = re.search(r"</head\s*>", tmpl_str, flags=re.IGNORECASE)
+    if head_close:
+        script = _wrap_runtime_for_jinja(tmpl_str, script, head_close.start())
+        return f"{tmpl_str[: head_close.start()]}  {script}\n{tmpl_str[head_close.start() :]}"
+
+    script = _wrap_runtime_for_jinja(tmpl_str, script, 0)
+    return f"{script}\n{tmpl_str}"
 
 
 class NetworkRenderStrategy(RenderStrategy):
@@ -101,11 +148,17 @@ async def render_custom_template(
         options: dict | None = None,
     ) -> str:
         """使用自定义文转图模板"""
-        default_options = {"full_page": True, "type": "jpeg", "quality": 40}
+        default_options = {
+            "full_page": True,
+            "type": "jpeg",
+            "quality": 40,
+        }
         if options:
             default_options |= options
 
-        tmpl_data = {"shiki_runtime": get_shiki_runtime()} | tmpl_data
+        if SHIKI_RUNTIME_TEMPLATE_PATTERN.search(tmpl_str):
+            tmpl_data = {"shiki_runtime": get_shiki_runtime()} | tmpl_data
+        tmpl_str = inject_shiki_runtime(tmpl_str)
         post_data = {
             "tmpl": tmpl_str,
             "json": return_url,
@@ -158,9 +211,11 @@ async def render(
         if not template_name:
             template_name = "base"
         tmpl_str = await self.get_template(name=template_name)
-        text_base64 = base64.b64encode(text.encode("utf-8")).decode("ascii")
         return await self.render_custom_template(
             tmpl_str,
-            {"text_base64": text_base64, "version": f"v{VERSION}"},
+            {
+                "text": text,
+                "version": f"v{VERSION}",
+            },
             return_url,
         )
diff --git a/astrbot/core/utils/t2i/template/astrbot_powershell.html b/astrbot/core/utils/t2i/template/astrbot_powershell.html
index 746d06fe80..3bfa014c0c 100644
--- a/astrbot/core/utils/t2i/template/astrbot_powershell.html
+++ b/astrbot/core/utils/t2i/template/astrbot_powershell.html
@@ -174,14 +174,14 @@
     <div id="content"></div>
   </main>
 
-  <script>{{ shiki_runtime | safe }}</script>
   <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
   <script src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/katex.min.js" integrity="sha384-hIoBPJpTUs74ddyc4bFZSM1TVlQDA60VBbJS0oA934VSz82sBx1X7kSx2ATBDIyd" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/contrib/auto-render.min.js" integrity="sha384-43gviWU0YVjaDtb/GhzOouOXtZMP/7XUzwPTstBeZFe/+rCMvRwr4yROQP43s0Xk" crossorigin="anonymous"></script>
+  <textarea id="markdown-source" hidden>{{ text | safe }}</textarea>
   <script>
     (function () {
       const contentElement = document.getElementById("content");
-      const source = decodeBase64Utf8("{{ text_base64 }}");
+      const source = document.getElementById("markdown-source").value;
 
       contentElement.innerHTML = marked.parse(source);
 
@@ -198,20 +198,6 @@
         });
       }
 
-      function decodeBase64Utf8(base64Text) {
-        const binary = window.atob(base64Text || "");
-        const bytes = Uint8Array.from(binary, (char) => char.charCodeAt(0));
-
-        if (window.TextDecoder) {
-          return new TextDecoder().decode(bytes);
-        }
-
-        let fallback = "";
-        bytes.forEach((byte) => {
-          fallback += String.fromCharCode(byte);
-        });
-        return decodeURIComponent(escape(fallback));
-      }
     })();
   </script>
 </body>
diff --git a/astrbot/core/utils/t2i/template/astrbot_vitepress.html b/astrbot/core/utils/t2i/template/astrbot_vitepress.html
index 381da3f98c..4e02636968 100644
--- a/astrbot/core/utils/t2i/template/astrbot_vitepress.html
+++ b/astrbot/core/utils/t2i/template/astrbot_vitepress.html
@@ -415,14 +415,14 @@ <h1 id="heroTitle">AstrBot Docs</h1>
     <footer class="vp-footer">Rendered by AstrBot {{ version }}</footer>
   </div>
 
-  <script>{{ shiki_runtime | safe }}</script>
   <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
   <script src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/katex.min.js" integrity="sha384-hIoBPJpTUs74ddyc4bFZSM1TVlQDA60VBbJS0oA934VSz82sBx1X7kSx2ATBDIyd" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/contrib/auto-render.min.js" integrity="sha384-43gviWU0YVjaDtb/GhzOouOXtZMP/7XUzwPTstBeZFe/+rCMvRwr4yROQP43s0Xk" crossorigin="anonymous"></script>
+  <textarea id="markdown-source" hidden>{{ text | safe }}</textarea>
   <script>
     (function () {
       const contentElement = document.getElementById("content");
-      const source = decodeBase64Utf8("{{ text_base64 }}");
+      const source = document.getElementById("markdown-source").value;
 
       marked.setOptions({
         gfm: true,
@@ -446,21 +446,6 @@ <h1 id="heroTitle">AstrBot Docs</h1>
       const headings = collectHeadings(contentElement);
       populateHero(contentElement, headings);
 
-      function decodeBase64Utf8(base64Text) {
-        const binary = window.atob(base64Text || "");
-        const bytes = Uint8Array.from(binary, (char) => char.charCodeAt(0));
-
-        if (window.TextDecoder) {
-          return new TextDecoder().decode(bytes);
-        }
-
-        let fallback = "";
-        bytes.forEach((byte) => {
-          fallback += String.fromCharCode(byte);
-        });
-        return decodeURIComponent(escape(fallback));
-      }
-
       function escapeHtml(value) {
         return String(value || "")
           .replaceAll("&", "&amp;")
diff --git a/astrbot/core/utils/t2i/template/base.html b/astrbot/core/utils/t2i/template/base.html
index 0659d40b07..19660fef81 100644
--- a/astrbot/core/utils/t2i/template/base.html
+++ b/astrbot/core/utils/t2i/template/base.html
@@ -242,14 +242,14 @@
   </div>
   <article style="margin-top: 32px" id="content"></article>
 
-  <script>{{ shiki_runtime | safe }}</script>
   <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
   <script src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/katex.min.js" integrity="sha384-hIoBPJpTUs74ddyc4bFZSM1TVlQDA60VBbJS0oA934VSz82sBx1X7kSx2ATBDIyd" crossorigin="anonymous"></script>
   <script src="https://cdn.jsdelivr.net/npm/katex@0.16.10/dist/contrib/auto-render.min.js" integrity="sha384-43gviWU0YVjaDtb/GhzOouOXtZMP/7XUzwPTstBeZFe/+rCMvRwr4yROQP43s0Xk" crossorigin="anonymous"></script>
+  <textarea id="markdown-source" hidden>{{ text | safe }}</textarea>
   <script>
     (function () {
       const contentElement = document.getElementById("content");
-      const source = decodeBase64Utf8("{{ text_base64 }}");
+      const source = document.getElementById("markdown-source").value;
 
       contentElement.innerHTML = marked.parse(source);
 
@@ -266,20 +266,6 @@
         });
       }
 
-      function decodeBase64Utf8(base64Text) {
-        const binary = window.atob(base64Text || "");
-        const bytes = Uint8Array.from(binary, (char) => char.charCodeAt(0));
-
-        if (window.TextDecoder) {
-          return new TextDecoder().decode(bytes);
-        }
-
-        let fallback = "";
-        bytes.forEach((byte) => {
-          fallback += String.fromCharCode(byte);
-        });
-        return decodeURIComponent(escape(fallback));
-      }
     })();
   </script>
 </body>
diff --git a/dashboard/src/components/shared/T2ITemplateEditor.vue b/dashboard/src/components/shared/T2ITemplateEditor.vue
index eac49c7601..485032dbc1 100644
--- a/dashboard/src/components/shared/T2ITemplateEditor.vue
+++ b/dashboard/src/components/shared/T2ITemplateEditor.vue
@@ -298,17 +298,82 @@ const syncPreviewVersion = async () => {
 
 const previewData = computed(() => ({
   text: tm('t2iTemplateEditor.previewText') || '这是一个示例文本，用于预览模板效果。\n\n这里可以包含多行文本，支持换行和各种格式。',
-  version: previewVersion.value 
+  version: previewVersion.value
 }))
 
+const injectShikiRuntime = (content) => {
+  if (content.includes('astrbot-t2i-shiki-runtime')) {
+    return content
+  }
+
+  const runtimeScript = getShikiRuntimeScript()
+  const headClose = content.search(/<\/head\s*>/i)
+  if (headClose >= 0) {
+    return `${content.slice(0, headClose)}  ${runtimeScript}\n${content.slice(headClose)}`
+  }
+
+  return `${runtimeScript}\n${content}`
+}
+
+const getShikiRuntimeScript = () => '<script id="astrbot-t2i-shiki-runtime" src="/t2i/shiki_runtime.iife.js"></scr' + 'ipt>'
+
+const hasMarkdownSource = (content) => /<[^>]+\bid=["']markdown-source["']/i.test(content)
+
+const insertMarkdownSource = (content) => {
+  const sourceElement = '  <textarea id="markdown-source" hidden>{{ text | safe }}</textarea>\n'
+  const markedScript = content.search(/^[ \t]*<script\s+src=["']https:\/\/cdn\.jsdelivr\.net\/npm\/marked\/marked\.min\.js["']><\/script>[ \t]*\r?\n?/im)
+  if (markedScript >= 0) {
+    return `${content.slice(0, markedScript)}${sourceElement}${content.slice(markedScript)}`
+  }
+
+  const bodyClose = content.search(/<\/body\s*>/i)
+  if (bodyClose >= 0) {
+    return `${content.slice(0, bodyClose)}${sourceElement}${content.slice(bodyClose)}`
+  }
+
+  return `${sourceElement}${content}`
+}
+
+const normalizeMarkdownSource = (content) => {
+  let normalized = content.replace(
+    /<script\s+id=["']markdown-source["']\s+type=["']text\/plain["']>\s*\{\{\s*text\s*\|\s*safe\s*\}\}\s*<\/script>/gi,
+    '<textarea id="markdown-source" hidden>{{ text | safe }}</textarea>'
+  )
+
+  normalized = normalized.replace(
+    /decodeBase64Utf8\("\{\{\s*text_base64\s*\}\}"\)/g,
+    'document.getElementById("markdown-source").value'
+  )
+  normalized = normalized.replace(
+    /document\.getElementById\(["']markdown-source["']\)\.textContent/g,
+    'document.getElementById("markdown-source").value'
+  )
+
+  if (/\{\{\s*text_base64\s*\}\}/.test(normalized) && !hasMarkdownSource(normalized)) {
+    normalized = insertMarkdownSource(normalized)
+  }
+
+  return normalized
+}
+
 const previewContent = computed(() => {
   try {
-    let content = templateContent.value
-    content = content.replace(/\{\{\s*text\s*\|\s*safe\s*\}\}/g, previewData.value.text)
-    content = content.replace(/\{\{\s*version\s*\}\}/g, previewData.value.version)
-    return content
+    let content = normalizeMarkdownSource(templateContent.value)
+    content = content.replace(/\{\{\s*text\s*\|\s*safe\s*\}\}/g, () => previewData.value.text)
+    content = content.replace(/\{\{\s*version\s*\}\}/g, () => previewData.value.version)
+    let usedLegacyShikiPlaceholder = false
+    content = content.replace(/<script\b[^>]*>\s*\{\{\s*shiki_runtime\s*\|\s*safe\s*\}\}\s*<\/script>/gi, () => {
+      usedLegacyShikiPlaceholder = true
+      return getShikiRuntimeScript()
+    })
+    content = content.replace(/\{\{\s*shiki_runtime\s*\|\s*safe\s*\}\}/g, () => {
+      usedLegacyShikiPlaceholder = true
+      return getShikiRuntimeScript()
+    })
+    return usedLegacyShikiPlaceholder ? content : injectShikiRuntime(content)
   } catch (error) {
-    return `<div style="color: red; padding: 20px;">模板渲染错误: ${error.message}</div>`
+    const errorMessage = error instanceof Error ? error.message : String(error)
+    return `<div style="color: red; padding: 20px;">模板渲染错误: ${errorMessage}</div>`
   }
 })
 
diff --git a/dashboard/src/i18n/locales/en-US/core/shared.json b/dashboard/src/i18n/locales/en-US/core/shared.json
index beb486b303..800c26178f 100644
--- a/dashboard/src/i18n/locales/en-US/core/shared.json
+++ b/dashboard/src/i18n/locales/en-US/core/shared.json
@@ -97,7 +97,7 @@
     "livePreview": "Live Preview (may differ)",
     "refreshPreview": "Refresh Preview",
     "previewText": "This is a sample text used to preview the template output.\n\nIt can contain multiple lines and various formatting.",
-    "syntaxHint": "Supports jinja2 syntax. Available variables: text | safe (text to render), version (AstrBot version)",
+    "syntaxHint": "Supports jinja2 syntax. Available variables: text | safe (text to render), version (AstrBot version). If the preview test content does not load or looks wrong, click Reset Base to restore the default template.",
     "saveAndApply": "Save and Apply Current Template",
     "confirmReset": "Confirm Reset",
     "confirmResetMessage": "Are you sure you want to reset the 'base' template to default content? Any unsaved changes in the editor will be lost. This action cannot be undone.",
diff --git a/dashboard/src/i18n/locales/ru-RU/core/shared.json b/dashboard/src/i18n/locales/ru-RU/core/shared.json
index 3ec2819618..f5445d25e3 100644
--- a/dashboard/src/i18n/locales/ru-RU/core/shared.json
+++ b/dashboard/src/i18n/locales/ru-RU/core/shared.json
@@ -98,7 +98,7 @@
         "livePreview": "Предпросмотр (может отличаться)",
         "refreshPreview": "Обновить",
         "previewText": "Это пример текста для предпросмотра результата шаблона.\n\nОн может содержать несколько строк и различные форматы.",
-        "syntaxHint": "Поддерживается синтаксис jinja2. Переменные: text | safe (текст для рендеринга), version (версия AstrBot)",
+        "syntaxHint": "Поддерживается синтаксис jinja2. Переменные: text | safe (текст для рендеринга), version (версия AstrBot). Если тестовый текст предпросмотра не загружается или выглядит неверно, нажмите «Сбросить 'base'», чтобы восстановить шаблон по умолчанию.",
         "saveAndApply": "Сохранить и применить текущий шаблон",
         "confirmReset": "Подтверждение сброса",
         "confirmResetMessage": "Вы уверены, что хотите сбросить шаблон 'base' до значений по умолчанию? Все несохраненные изменения будут потеряны. Это действие необратимо.",
@@ -109,4 +109,4 @@
         "confirmAction": "Подтверждение действия",
         "confirmApplyMessage": "Вы уверены, что хотите сохранить изменения в '{name}' и сделать его активным шаблоном?"
     }
-}
\ No newline at end of file
+}
diff --git a/dashboard/src/i18n/locales/zh-CN/core/shared.json b/dashboard/src/i18n/locales/zh-CN/core/shared.json
index fd064e2e41..dfc3a8d485 100644
--- a/dashboard/src/i18n/locales/zh-CN/core/shared.json
+++ b/dashboard/src/i18n/locales/zh-CN/core/shared.json
@@ -97,7 +97,7 @@
     "livePreview": "实时预览(可能有差异)",
     "refreshPreview": "刷新预览",
     "previewText": "这是一个示例文本，用于预览模板效果。\n\n这里可以包含多行文本，支持换行和各种格式。",
-    "syntaxHint": "支持 jinja2 语法。可用变量：text | safe（要渲染的文本）, version（AstrBot 版本）",
+    "syntaxHint": "支持 jinja2 语法。可用变量：text | safe（要渲染的文本）, version（AstrBot 版本）。如果预览测试内容未加载或显示异常，请点击“重置Base”恢复默认模板。",
     "saveAndApply": "保存应用当前编辑模板",
     "confirmReset": "确认重置",
     "confirmResetMessage": "确定要将 'base' 模板恢复为默认内容吗？当前编辑器中的任何未保存更改将丢失。此操作无法撤销。",
diff --git a/dashboard/vite.config.ts b/dashboard/vite.config.ts
index 45a62d94f1..05eaff1d3d 100644
--- a/dashboard/vite.config.ts
+++ b/dashboard/vite.config.ts
@@ -1,11 +1,16 @@
+import { readFileSync } from 'fs';
 import { fileURLToPath, URL } from 'url';
-import { defineConfig } from 'vite';
+import { defineConfig, type Plugin } from 'vite';
 import vue from '@vitejs/plugin-vue';
 import vuetify from 'vite-plugin-vuetify';
 import webfontDl from 'vite-plugin-webfont-dl';
 // @ts-ignore — .mjs not in TS project scope; Vite resolves this at runtime
 import { runMdiSubset } from './scripts/subset-mdi-font.mjs';
 
+const t2iShikiRuntimePath = fileURLToPath(
+  new URL('../astrbot/core/utils/t2i/template/shiki_runtime.iife.js', import.meta.url)
+);
+
 // Vite plugin: run MDI icon font subsetting (build only)
 function mdiSubset() {
   return {
@@ -17,11 +22,45 @@ function mdiSubset() {
   };
 }
 
+function t2iShikiRuntimeAsset(): Plugin {
+  return {
+    name: 'vite-plugin-t2i-shiki-runtime',
+    configureServer(server) {
+      server.middlewares.use('/t2i/shiki_runtime.iife.js', (_req, res) => {
+        try {
+          res.statusCode = 200;
+          res.setHeader('Content-Type', 'text/javascript; charset=utf-8');
+          res.end(readFileSync(t2iShikiRuntimePath));
+        } catch (error) {
+          res.statusCode = 404;
+          res.end(`T2I Shiki runtime not found: ${error instanceof Error ? error.message : String(error)}`);
+        }
+      });
+    },
+    generateBundle() {
+      try {
+        this.emitFile({
+          type: 'asset',
+          fileName: 't2i/shiki_runtime.iife.js',
+          source: readFileSync(t2iShikiRuntimePath)
+        });
+      } catch (error) {
+        this.warn(
+          `Skipping T2I Shiki runtime asset because it could not be read: ${
+            error instanceof Error ? error.message : String(error)
+          }`
+        );
+      }
+    }
+  };
+}
+
 // https://vitejs.dev/config/
 export default defineConfig(({ command }) => ({
   plugins: [
     // Only run MDI subsetting during production builds, skip in dev server
     ...(command === 'build' ? [mdiSubset()] : []),
+    t2iShikiRuntimeAsset(),
     vue({
       template: {
         compilerOptions: {