diff --git a/addon/chrome/content/overlay.xul b/addon/chrome/content/overlay.xul
index 8914516..499fc4e 100644
--- a/addon/chrome/content/overlay.xul
+++ b/addon/chrome/content/overlay.xul
@@ -106,6 +106,12 @@
 
     <menupopup id="menu_HelpPopup">
         <menuseparator class="menu-betternotes" />
+        <menu id="menu_ocrsetting_betternotes" class="menu-betternotes" label="&zotero.__addonRef__.workspace.menu.OCRSetting;">
+            <menupopup id="menu_ocrsettingpopup" onpopupshowing="Zotero.Knowledge4Zotero.views.updateOCRStyleMenu();">
+                <menuitem id="menu_ocr_bing_betternotes" class="menu-betternotes" label="&zotero.__addonRef__.workspace.menu.OCRBing;" oncommand="Zotero.Knowledge4Zotero.events.onEditorEvent.bind(Zotero.Knowledge4Zotero.events)({type: 'setOCREngine', content: {params: {engine: 'bing'}}})" type="checkbox" />
+                <menuitem id="menu_ocr_mathpix_betternotes" class="menu-betternotes" label="&zotero.__addonRef__.workspace.menu.OCRMathpix;" oncommand="Zotero.Knowledge4Zotero.events.onEditorEvent.bind(Zotero.Knowledge4Zotero.events)({type: 'setOCREngine', content: {params: {engine: 'mathpix'}}})" type="checkbox" />
+            </menupopup>
+        </menu>
         <menuitem id="menu_guide_betternotes menu-betternotes" label="&zotero.__addonRef__.workspace.menu.guide;" command="cmd_guide_betternotes" />
         <menuitem id="menu_about_betternotes menu-betternotes" label="&zotero.__addonRef__.workspace.menu.about;" command="cmd_about_betternotes" />
     </menupopup>
diff --git a/addon/chrome/locale/en-US/overlay.dtd b/addon/chrome/locale/en-US/overlay.dtd
index 57be371..500dee9 100644
--- a/addon/chrome/locale/en-US/overlay.dtd
+++ b/addon/chrome/locale/en-US/overlay.dtd
@@ -12,6 +12,9 @@
 <!ENTITY zotero.__addonRef__.workspace.menu.insertItemTemplate "Insert Items Using Template">
 <!ENTITY zotero.__addonRef__.workspace.menu.editTemplate "Note Template Editor">
 <!ENTITY zotero.__addonRef__.workspace.menu.citeSetting "Citation Style in Notes">
+<!ENTITY zotero.__addonRef__.workspace.menu.OCRSetting "Annotation Math OCR">
+<!ENTITY zotero.__addonRef__.workspace.menu.OCRBing "Bing">
+<!ENTITY zotero.__addonRef__.workspace.menu.OCRMathpix "Mathpix">
 <!ENTITY zotero.__addonRef__.workspace.menu.addheading "Insert Heading...">
 <!ENTITY zotero.__addonRef__.workspace.menu.indent "Decrease Heading Level">
 <!ENTITY zotero.__addonRef__.workspace.menu.unindent "Increase Heading Level">
diff --git a/addon/chrome/locale/zh-CN/overlay.dtd b/addon/chrome/locale/zh-CN/overlay.dtd
index 5cd1c61..6dbfec7 100644
--- a/addon/chrome/locale/zh-CN/overlay.dtd
+++ b/addon/chrome/locale/zh-CN/overlay.dtd
@@ -12,6 +12,9 @@
 <!ENTITY zotero.__addonRef__.workspace.menu.insertItemTemplate "使用模板插入多个条目">
 <!ENTITY zotero.__addonRef__.workspace.menu.editTemplate "笔记模板编辑器">
 <!ENTITY zotero.__addonRef__.workspace.menu.citeSetting "笔记引用格式">
+<!ENTITY zotero.__addonRef__.workspace.menu.OCRSetting "注释公式识别">
+<!ENTITY zotero.__addonRef__.workspace.menu.OCRBing "Bing">
+<!ENTITY zotero.__addonRef__.workspace.menu.OCRMathpix "Mathpix">
 <!ENTITY zotero.__addonRef__.workspace.menu.addheading "插入标题...">
 <!ENTITY zotero.__addonRef__.workspace.menu.indent "降低标题层级">
 <!ENTITY zotero.__addonRef__.workspace.menu.unindent "提升标题层级">
diff --git a/addon/defaults/preferences/defaults.js b/addon/defaults/preferences/defaults.js
index ecb7a0b..de75a80 100644
--- a/addon/defaults/preferences/defaults.js
+++ b/addon/defaults/preferences/defaults.js
@@ -10,3 +10,6 @@ pref("extensions.zotero.Knowledge4Zotero.embedLink", true);
 pref("extensions.zotero.Knowledge4Zotero.exportNote", false);
 pref("extensions.zotero.Knowledge4Zotero.exportCopy", false);
 pref("extensions.zotero.Knowledge4Zotero.exportPDF", false);
+pref("extensions.zotero.Knowledge4Zotero.OCREngine", "bing");
+pref("extensions.zotero.Knowledge4Zotero.OCRMathpix.Appid", "");
+pref("extensions.zotero.Knowledge4Zotero.OCRMathpix.Appkey", "");
diff --git a/src/events.ts b/src/events.ts
index 79b5bc0..c2a6a9d 100644
--- a/src/events.ts
+++ b/src/events.ts
@@ -1941,6 +1941,30 @@ class AddonEvents extends AddonBase {
         "Better Notes",
         "Image copied to clipboard."
       );
+    } else if (message.type === "setOCREngine") {
+      /*
+        message.content = {
+          params: { engine: string }
+        }
+      */
+      const engine = message.content.params.engine;
+      if (engine === "mathpix") {
+        Zotero.Prefs.set(
+          "Knowledge4Zotero.OCRMathpix.Appid",
+          prompt(
+            "Please input app_id",
+            Zotero.Prefs.get("Knowledge4Zotero.OCRMathpix.Appid") as string
+          )
+        );
+        Zotero.Prefs.set(
+          "Knowledge4Zotero.OCRMathpix.Appkey",
+          prompt(
+            "Please input app_key",
+            Zotero.Prefs.get("Knowledge4Zotero.OCRMathpix.Appkey") as string
+          )
+        );
+      }
+      Zotero.Prefs.set("Knowledge4Zotero.OCREngine", engine);
     } else if (message.type === "ocrImageAnnotation") {
       /*
         message.content = {
@@ -1948,47 +1972,84 @@ class AddonEvents extends AddonBase {
         }
       */
       const annotationItem: Zotero.Item = message.content.params.annotationItem;
-      const xhr = await Zotero.HTTP.request(
-        "POST",
-        "https://www.bing.com/cameraexp/api/v1/getlatex",
-        {
-          headers: {
-            "content-type": "application/json",
-          },
-          body: JSON.stringify({
-            data: message.content.params.src.split(",").pop(),
-            inputForm: "Image",
-            clientInfo: { platform: "edge" },
-          }),
-          responseType: "json",
-        }
-      );
-      if (xhr && xhr.status && xhr.status === 200) {
-        if (xhr.response.isError) {
-          this._Addon.views.showProgressWindow(
-            "Better Notes OCR",
-            xhr.response.errorMessage,
-            "fail"
-          );
+      let result: string;
+      let success: boolean;
+      const engine = Zotero.Prefs.get("Knowledge4Zotero.OCREngine");
+      if (engine === "mathpix") {
+        const xhr = await Zotero.HTTP.request(
+          "POST",
+          "https://api.mathpix.com/v3/text",
+          {
+            headers: {
+              "Content-Type": "application/json; charset=utf-8",
+              app_id: Zotero.Prefs.get("Knowledge4Zotero.OCRMathpix.Appid"),
+              app_key: Zotero.Prefs.get("Knowledge4Zotero.OCRMathpix.Appkey"),
+            },
+            body: JSON.stringify({
+              src: message.content.params.src,
+              math_inline_delimiters: ["$", "$"],
+              math_display_delimiters: ["$$", "$$"],
+              rm_spaces: true,
+            }),
+            responseType: "json",
+          }
+        );
+        console.log(xhr);
+        if (xhr && xhr.status && xhr.status === 200 && xhr.response.text) {
+          result = xhr.response.text;
+          success = true;
         } else {
-          let ocrResult = xhr.response.latex
-            ? `$${xhr.response.latex.replace(/ /g, "")}$`
-            : xhr.response.ocrText;
-          annotationItem.annotationComment = `${
-            annotationItem.annotationComment
-              ? `${annotationItem.annotationComment}\n`
-              : ""
-          }${ocrResult}`;
-          await annotationItem.saveTx();
-          this._Addon.views.showProgressWindow(
-            "Better Notes OCR",
-            `OCR Result: ${ocrResult}`
-          );
+          result =
+            xhr.status === 200 ? xhr.response.error : `${xhr.status} Error`;
+          success = false;
         }
+      } else if (engine === "bing") {
+        const xhr = await Zotero.HTTP.request(
+          "POST",
+          "https://www.bing.com/cameraexp/api/v1/getlatex",
+          {
+            headers: {
+              "Content-Type": "application/json",
+            },
+            body: JSON.stringify({
+              data: message.content.params.src.split(",").pop(),
+              inputForm: "Image",
+              clientInfo: { platform: "edge" },
+            }),
+            responseType: "json",
+          }
+        );
+        if (xhr && xhr.status && xhr.status === 200 && !xhr.response.isError) {
+          result = xhr.response.latex
+            ? `$${xhr.response.latex}$`
+            : xhr.response.ocrText;
+          success = true;
+        } else {
+          result =
+            xhr.status === 200
+              ? xhr.response.errorMessage
+              : `${xhr.status} Error`;
+          success = false;
+        }
+      } else {
+        result = "OCR Engine Not Found";
+        success = false;
+      }
+      if (success) {
+        annotationItem.annotationComment = `${
+          annotationItem.annotationComment
+            ? `${annotationItem.annotationComment}\n`
+            : ""
+        }${result}`;
+        await annotationItem.saveTx();
+        this._Addon.views.showProgressWindow(
+          "Better Notes OCR",
+          `OCR Result: ${result}`
+        );
       } else {
         this._Addon.views.showProgressWindow(
           "Better Notes OCR",
-          `${xhr.status} Error`,
+          result,
           "fail"
         );
       }
diff --git a/src/views.ts b/src/views.ts
index 87bb443..9bd0d6d 100644
--- a/src/views.ts
+++ b/src/views.ts
@@ -939,6 +939,22 @@ class AddonViews extends AddonBase {
     });
   }
 
+  updateOCRStyleMenu() {
+    Zotero.debug(`updateOCRStyleMenu`);
+    const popup = document.getElementById("menu_ocrsettingpopup");
+    Array.prototype.forEach.call(popup.children, (e) =>
+      e.setAttribute("checked", false)
+    );
+    let engine = Zotero.Prefs.get("Knowledge4Zotero.OCREngine");
+    if (!engine) {
+      engine = "bing";
+      Zotero.Prefs.set("Knowledge4Zotero.OCREngine", engine);
+    }
+    (
+      document.getElementById(`menu_ocr_${engine}_betternotes`) as XUL.Menuitem
+    ).setAttribute("checked", true);
+  }
+
   updateWordCount() {
     const _window = this._Addon.knowledge.workspaceTabId
       ? window