diff --git a/src/main/main.ts b/src/main/main.ts
index e58d7b5..cf41481 100644
--- a/src/main/main.ts
+++ b/src/main/main.ts
@@ -1,4 +1,5 @@
 import { app, BrowserWindow, ipcMain, net, session } from "electron";
+import * as fs from "node:fs/promises";
 import * as path from "node:path";
 
 const isDev = Boolean(process.env.VITE_DEV_SERVER_URL);
@@ -218,6 +219,27 @@ const postText = async (path: string, body: unknown) => {
   });
 };
 
+const requestSessionId = async (username: string) => {
+  const loginResult = await postText("/launcher/profile/login", { username });
+  if (!loginResult.ok) {
+    return { ok: false, error: loginResult.error ?? "login_failed", url: loginResult.url };
+  }
+
+  const sessionId = loginResult.data?.trim();
+  if (!sessionId) {
+    return { ok: false, error: "empty_session", url: loginResult.url };
+  }
+
+  return { ok: true, sessionId, url: loginResult.url };
+};
+
+const registerProfile = async (username: string) => {
+  return await postJson("/launcher/profile/register", {
+    username,
+    edition: "Standard"
+  });
+};
+
 
 const createWindow = () => {
   const mainWindow = new BrowserWindow({
@@ -269,17 +291,87 @@ app.whenReady().then(() => {
   ipcMain.handle("spt:fetchProfile", async (_event, payload: { username: string }) => {
     const username = payload.username.trim();
 
-    const loginResult = await postText("/launcher/profile/login", { username });
-    if (!loginResult.ok || !loginResult.data) {
-      return loginResult;
+    const fetchProfileInfo = async (): Promise<{
+      ok: boolean;
+      status?: number;
+      data?: unknown;
+      error?: string;
+      url: string;
+    }> => {
+      const sessionResult = await requestSessionId(username);
+      if (!sessionResult.ok) {
+        return {
+          ok: false,
+          error: sessionResult.error ?? "login_failed",
+          url: sessionResult.url
+        };
+      }
+
+      return await postJson(
+        "/launcher/profile/info",
+        { username },
+        {
+          Cookie: `PHPSESSID=${sessionResult.sessionId}`
+        }
+      );
+    };
+
+    const infoResult = await fetchProfileInfo();
+    if (infoResult.ok && infoResult.data) {
+      return infoResult;
     }
 
-    const sessionId = loginResult.data.trim();
-    return await postJson(
+    await registerProfile(username);
+    return await fetchProfileInfo();
+  });
+
+  ipcMain.handle("spt:downloadProfile", async (_event, payload: { username: string }) => {
+    const username = payload.username.trim();
+
+    const sessionResult = await requestSessionId(username);
+    if (!sessionResult.ok) {
+      return sessionResult;
+    }
+
+    const infoResult = await postJson(
       "/launcher/profile/info",
       { username },
       {
-        Cookie: `PHPSESSID=${sessionId}`
+        Cookie: `PHPSESSID=${sessionResult.sessionId}`
+      }
+    );
+
+    if (!infoResult.ok || !infoResult.data) {
+      return infoResult;
+    }
+
+    const downloadsDir = app.getPath("downloads");
+    const fileName = `spt-profile-${username}-${Date.now()}.json`;
+    const filePath = path.join(downloadsDir, fileName);
+
+    await fs.writeFile(filePath, JSON.stringify(infoResult.data, null, 2), "utf8");
+
+    return {
+      ok: true,
+      status: infoResult.status,
+      url: infoResult.url,
+      filePath
+    };
+  });
+
+  ipcMain.handle("spt:resetProfile", async (_event, payload: { username: string }) => {
+    const username = payload.username.trim();
+
+    const sessionResult = await requestSessionId(username);
+    if (!sessionResult.ok) {
+      return sessionResult;
+    }
+
+    return await postJson(
+      "/launcher/profile/change/wipe",
+      { username },
+      {
+        Cookie: `PHPSESSID=${sessionResult.sessionId}`
       }
     );
   });
diff --git a/src/preload/preload.ts b/src/preload/preload.ts
index 06a9eb1..f59fb1b 100644
--- a/src/preload/preload.ts
+++ b/src/preload/preload.ts
@@ -6,5 +6,9 @@ contextBridge.exposeInMainWorld("sptLauncher", {
   appName: "SPT Launcher",
   checkServerHealth: () => ipcRenderer.invoke("spt:checkServerHealth"),
   fetchProfile: (payload: { username: string }) =>
-    ipcRenderer.invoke("spt:fetchProfile", payload)
+    ipcRenderer.invoke("spt:fetchProfile", payload),
+  downloadProfile: (payload: { username: string }) =>
+    ipcRenderer.invoke("spt:downloadProfile", payload),
+  resetProfile: (payload: { username: string }) =>
+    ipcRenderer.invoke("spt:resetProfile", payload)
 });
diff --git a/src/renderer/App.tsx b/src/renderer/App.tsx
index 5181e74..5ae942d 100644
--- a/src/renderer/App.tsx
+++ b/src/renderer/App.tsx
@@ -25,6 +25,7 @@ const App = () => {
     side?: string;
     id?: string;
   } | undefined>();
+  const [profileActionInProgress, setProfileActionInProgress] = useState(false);
   const [syncInProgress, setSyncInProgress] = useState(false);
   const [simulateSyncFail, setSimulateSyncFail] = useState(false);
   const healthCheckInFlightRef = useRef(false);
@@ -189,6 +190,69 @@ const App = () => {
     setScreen("login");
   };
 
+  const handleProfileDownload = async () => {
+    const username = profile?.username?.trim() ?? loginId.trim();
+    if (!username) {
+      window.alert("아이디를 입력해주세요.");
+      return;
+    }
+
+    if (!window.sptLauncher?.downloadProfile) {
+      window.alert("프로필 다운로드 기능이 준비되지 않았습니다.");
+      return;
+    }
+
+    setProfileActionInProgress(true);
+    try {
+      const result = await window.sptLauncher.downloadProfile({ username });
+      if (!result.ok) {
+        window.alert(result.error ?? "프로필 다운로드에 실패했습니다.");
+        return;
+      }
+
+      window.alert(`프로필을 다운로드했습니다: ${result.filePath ?? "-"}`);
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      window.alert(message);
+    } finally {
+      setProfileActionInProgress(false);
+    }
+  };
+
+  const handleProfileReset = async () => {
+    const username = profile?.username?.trim() ?? loginId.trim();
+    if (!username) {
+      window.alert("아이디를 입력해주세요.");
+      return;
+    }
+
+    if (!window.sptLauncher?.resetProfile) {
+      window.alert("프로필 리셋 기능이 준비되지 않았습니다.");
+      return;
+    }
+
+    const confirmed = window.confirm("프로필을 리셋할까요?");
+    if (!confirmed) {
+      return;
+    }
+
+    setProfileActionInProgress(true);
+    try {
+      const result = await window.sptLauncher.resetProfile({ username });
+      if (!result.ok) {
+        window.alert(result.error ?? "프로필 리셋에 실패했습니다.");
+        return;
+      }
+
+      window.alert("프로필 리셋 요청이 완료되었습니다.");
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      window.alert(message);
+    } finally {
+      setProfileActionInProgress(false);
+    }
+  };
+
   const handleLaunch = () => {
     if (syncInProgress) {
       return;
@@ -232,7 +296,7 @@ const App = () => {
               : "서버 연결이 불가합니다. 10초마다 자동으로 재시도합니다."}
           </p>
           <p className="notice">
-            {serverCheckedUrl ? `Endpoint(endpoint): ${serverCheckedUrl}` : "Endpoint(endpoint): (unknown)"}
+            {serverCheckedUrl ? `Endpoint(endpoint): ${serverCheckedUrl}` : "Endpoint(endpoint): "}
             {serverStatusCode ? ` · HTTP ${serverStatusCode}` : ""}
             {typeof serverLatencyMs === "number" ? ` · ${serverLatencyMs}ms` : ""}
             {serverError ? ` · ${serverError}` : ""}
@@ -349,14 +413,21 @@ const App = () => {
           <section className="card profile">
             <div>
               <h2>프로필 정보</h2>
-              <p className="muted">아이디: {profile?.username ?? "-"}</p>
-              <p className="muted">닉네임: {profile?.nickname ?? "미등록"}</p>
-              <p className="muted">레벨: {typeof profile?.level === "number" ? profile.level : "-"}</p>
+              <p className="muted">아이디: {profile?.username ?? ""}</p>
+              <p className="muted">닉네임: {profile?.nickname ?? ""}</p>
+              <p className="muted">레벨: {typeof profile?.level === "number" ? profile.level : ""}</p>
               {profile?.side && <p className="muted">진영: {profile.side}</p>}
             </div>
             <div className="profile-actions">
-              <button type="button">프로필 다운로드</button>
-              <button type="button" className="ghost">
+              <button type="button" onClick={handleProfileDownload} disabled={profileActionInProgress}>
+                {profileActionInProgress ? "처리 중..." : "프로필 다운로드"}
+              </button>
+              <button
+                type="button"
+                className="ghost"
+                onClick={handleProfileReset}
+                disabled={profileActionInProgress}
+              >
                 프로필 리셋
               </button>
             </div>
diff --git a/src/renderer/vite-env.d.ts b/src/renderer/vite-env.d.ts
index 30fb4f1..df7f4a8 100644
--- a/src/renderer/vite-env.d.ts
+++ b/src/renderer/vite-env.d.ts
@@ -17,5 +17,19 @@ interface Window {
       error?: string;
       url: string;
     }>;
+    downloadProfile: (payload: { username: string }) => Promise<{
+      ok: boolean;
+      status?: number;
+      url: string;
+      filePath?: string;
+      error?: string;
+    }>;
+    resetProfile: (payload: { username: string }) => Promise<{
+      ok: boolean;
+      status?: number;
+      data?: unknown;
+      error?: string;
+      url: string;
+    }>;
   };
 }