diff --git a/ui/src/class/contentExporter.ts b/ui/src/class/contentExporter.ts
index e9afb85..2fb67a5 100644
--- a/ui/src/class/contentExporter.ts
+++ b/ui/src/class/contentExporter.ts
@@ -22,7 +22,7 @@ export class ContentExporter {
           (type) => type.type === content.rawType?.toLowerCase(),
         )?.extension || "";
     } else if (exportType === "markdown") {
-      if (content.rawType === "html") {
+      if (content.rawType?.toLowerCase() === "html") {
         const converter = ConverterFactory.getConverter("html", "markdown");
         exportContent = converter.convert(post, content);
       } else {
diff --git a/ui/src/class/postOperations.ts b/ui/src/class/postOperations.ts
index ec3686e..57c9dfc 100644
--- a/ui/src/class/postOperations.ts
+++ b/ui/src/class/postOperations.ts
@@ -18,12 +18,15 @@ export class PostOperations {
       return;
     }
 
-    if (content.rawType === toType) {
+    if (content.rawType.toLowerCase() === toType) {
       Toast.warning(`当前文档已经是 ${toType} 格式，已忽略转换`);
       return;
     }
 
-    const converter = ConverterFactory.getConverter(content.rawType, toType);
+    const converter = ConverterFactory.getConverter(
+      content.rawType.toLowerCase(),
+      toType,
+    );
 
     const convertedContent = converter.convert(post, content);
 
diff --git a/ui/src/utils/markdown.ts b/ui/src/utils/markdown.ts
index 0e04058..db361ac 100644
--- a/ui/src/utils/markdown.ts
+++ b/ui/src/utils/markdown.ts
@@ -9,7 +9,7 @@ export function convertPostContentToMarkdown(
   content: ContentWrapper,
   needsFrontMatter?: boolean,
 ): string {
-  if (content.rawType === "markdown") {
+  if (content.rawType?.toLowerCase() === "markdown") {
     return content.raw || "";
   }
 
@@ -38,7 +38,7 @@ export function convertPostContentToMarkdown(
 }
 
 export function convertPostContentToHTML(content: ContentWrapper): string {
-  if (content.rawType === "html") {
+  if (content.rawType?.toLowerCase() === "html") {
     return content.raw || "";
   }