diff --git a/src/App.tsx b/src/App.tsx
index bcf5d15..14fe6b9 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -8,9 +8,22 @@ import { parseSm2Cert, parseCertFromFile } from './utils/algorithm/cert'
 import { hexToUtf8, utf8ToHex, hexToBase64, base64ToHex } from './utils/convert'
 
 function App() {
-  const [activeTab, setActiveTab] = useState('sm3')
+  // 从localStorage读取当前分类，默认sm3
+  const getInitialTab = () => {
+    try {
+      const savedTab = localStorage.getItem('activeTab')
+      if (['sm2', 'sm3', 'cert'].includes(savedTab || '')) {
+        return savedTab || 'sm3'
+      }
+    } catch (error) {
+      console.error('Failed to read from localStorage:', error)
+    }
+    return 'sm3'
+  }
+  
+  const [activeTab, setActiveTab] = useState(getInitialTab())
   const [isMobile, setIsMobile] = useState(false)
-  const [mobileTab, setMobileTab] = useState('sm3')
+  const [mobileTab, setMobileTab] = useState(getInitialTab())
   
   // 检测是否为移动设备
   useEffect(() => {
@@ -28,13 +41,27 @@ function App() {
   
   // 处理移动设备的 tab 切换
   const handleMobileTabChange = (e: React.ChangeEvent<HTMLSelectElement>) => {
-    setMobileTab(e.target.value)
-    setActiveTab(e.target.value)
+    const tab = e.target.value
+    setMobileTab(tab)
+    setActiveTab(tab)
+    // 保存到localStorage
+    try {
+      localStorage.setItem('activeTab', tab)
+    } catch (error) {
+      console.error('Failed to save to localStorage:', error)
+    }
   }
   
   // 处理桌面端的 tab 切换
   const handleTabChange = (tab: string) => {
     setActiveTab(tab)
+    setMobileTab(tab)
+    // 保存到localStorage
+    try {
+      localStorage.setItem('activeTab', tab)
+    } catch (error) {
+      console.error('Failed to save to localStorage:', error)
+    }
   }
   
 
@@ -162,12 +189,19 @@ function App() {
     
     const reader = new FileReader()
     reader.onload = (event) => {
-      const result = event.target?.result as ArrayBuffer
+      const result = event.target?.result
       if (result) {
-        const base64Cert = parseCertFromFile(result)
-        handleParseCert(base64Cert)
+        try {
+          const base64Cert = parseCertFromFile(result as ArrayBuffer)
+          handleParseCert(base64Cert)
+        } catch (error) {
+          alert('证书读取失败: ' + (error instanceof Error ? error.message : String(error)))
+        }
       }
     }
+    reader.onerror = () => {
+      alert('证书文件读取失败')
+    }
     reader.readAsArrayBuffer(file)
   }
   
@@ -1033,68 +1067,34 @@ function App() {
       {/* 转换工具面板 */}
       {activeTab === 'convert' && (
         <div className="panel" style={{ backgroundColor: '#1e1e1e', padding: '20px', borderRadius: '8px', boxShadow: '0 2px 4px rgba(0, 0, 0, 0.3)' }}>
-          <h2 style={{ color: '#f59e0b', marginBottom: '20px' }}>Hex / UTF8 / Base64 转换</h2>
+
           
-          <div style={{ display: 'flex', gap: '1rem', marginBottom: '1rem', flexDirection: isMobile ? 'column' : 'row' }}>
-            <div className="form-group" style={{ flex: 1 }}>
-              <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>UTF8 输入</label>
-              <textarea 
-                value={utf8Input} 
-                onChange={(e) => setUtf8Input(e.target.value)}
-                placeholder="输入 UTF8 字符串" 
-                style={{ 
-                  height: '200px',
-                  width: '100%',
-                  padding: '10px',
-                  border: '1px solid #333',
-                  borderRadius: '4px',
-                  backgroundColor: '#2d2d2d',
-                  color: '#e0e0e0',
-                  fontSize: '14px',
-                  resize: 'vertical'
-                }}
-              />
-              <button 
-                onClick={handleUtf8ToHex}
-                style={{
-                  marginTop: '0.5rem',
-                  padding: '8px 16px',
-                  border: 'none',
-                  borderRadius: '4px',
-                  background: '#f59e0b',
-                  color: '#121212',
-                  fontSize: '14px',
-                  fontWeight: 'bold',
-                  cursor: 'pointer',
-                  transition: 'background 0.3s ease'
-                }}
-              >
-                UTF8 → Hex
-              </button>
-            </div>
-            
-            <div className="form-group" style={{ flex: 1 }}>
-              <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>Hex 输入</label>
-              <textarea 
-                value={hexInput} 
-                onChange={(e) => setHexInput(e.target.value)}
-                placeholder="输入 hex 字符串" 
-                style={{ 
-                  height: '200px',
-                  width: '100%',
-                  padding: '10px',
-                  border: '1px solid #333',
-                  borderRadius: '4px',
-                  backgroundColor: '#2d2d2d',
-                  color: '#e0e0e0',
-                  fontSize: '14px',
-                  resize: 'vertical'
-                }}
-              />
-              <div style={{ display: 'flex', gap: '10px', marginTop: '0.5rem' }}>
+          {/* Hex / UTF8 互转卡片 */}
+          <div style={{ backgroundColor: '#2d2d2d', padding: '15px', borderRadius: '8px', marginBottom: '20px' }}>
+            <h3 style={{ color: '#e0e0e0', marginBottom: '15px' }}>Hex / UTF8 互转</h3>
+            <div style={{ display: 'flex', gap: '1rem', flexDirection: isMobile ? 'column' : 'row' }}>
+              <div className="form-group" style={{ flex: 1 }}>
+                <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>UTF8 输入</label>
+                <textarea 
+                  value={utf8Input} 
+                  onChange={(e) => setUtf8Input(e.target.value)}
+                  placeholder="输入 UTF8 字符串" 
+                  style={{ 
+                    height: '150px',
+                    width: '100%',
+                    padding: '10px',
+                    border: '1px solid #333',
+                    borderRadius: '4px',
+                    backgroundColor: '#1e1e1e',
+                    color: '#e0e0e0',
+                    fontSize: '14px',
+                    resize: 'vertical'
+                  }}
+                />
                 <button 
-                  onClick={handleHexToUtf8}
+                  onClick={handleUtf8ToHex}
                   style={{
+                    marginTop: '0.5rem',
                     padding: '8px 16px',
                     border: 'none',
                     borderRadius: '4px',
@@ -1103,15 +1103,78 @@ function App() {
                     fontSize: '14px',
                     fontWeight: 'bold',
                     cursor: 'pointer',
-                    transition: 'background 0.3s ease',
-                    flex: 1
+                    transition: 'background 0.3s ease'
+                  }}
+                >
+                  UTF8 → Hex
+                </button>
+              </div>
+              
+              <div className="form-group" style={{ flex: 1 }}>
+                <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>Hex 输入</label>
+                <textarea 
+                  value={hexInput} 
+                  onChange={(e) => setHexInput(e.target.value)}
+                  placeholder="输入 hex 字符串" 
+                  style={{ 
+                    height: '150px',
+                    width: '100%',
+                    padding: '10px',
+                    border: '1px solid #333',
+                    borderRadius: '4px',
+                    backgroundColor: '#1e1e1e',
+                    color: '#e0e0e0',
+                    fontSize: '14px',
+                    resize: 'vertical'
+                  }}
+                />
+                <button 
+                  onClick={handleHexToUtf8}
+                  style={{
+                    marginTop: '0.5rem',
+                    padding: '8px 16px',
+                    border: 'none',
+                    borderRadius: '4px',
+                    background: '#f59e0b',
+                    color: '#121212',
+                    fontSize: '14px',
+                    fontWeight: 'bold',
+                    cursor: 'pointer',
+                    transition: 'background 0.3s ease'
                   }}
                 >
                   UTF8 ← Hex
                 </button>
+              </div>
+            </div>
+          </div>
+          
+          {/* Hex / Base64 互转卡片 */}
+          <div style={{ backgroundColor: '#2d2d2d', padding: '15px', borderRadius: '8px' }}>
+            <h3 style={{ color: '#e0e0e0', marginBottom: '15px' }}>Hex / Base64 互转</h3>
+            <div style={{ display: 'flex', gap: '1rem', flexDirection: isMobile ? 'column' : 'row' }}>
+              <div className="form-group" style={{ flex: 1 }}>
+                <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>Base64 输入</label>
+                <textarea 
+                  value={base64Input} 
+                  onChange={(e) => setBase64Input(e.target.value)}
+                  placeholder="输入 Base64 字符串" 
+                  style={{ 
+                    height: '150px',
+                    width: '100%',
+                    padding: '10px',
+                    border: '1px solid #333',
+                    borderRadius: '4px',
+                    backgroundColor: '#1e1e1e',
+                    color: '#e0e0e0',
+                    fontSize: '14px',
+                    resize: 'vertical'
+                  }}
+                />
                 <button 
-                  onClick={handleHexToBase64}
+                  onClick={handleBase64ToHex}
                   style={{
+                    marginTop: '0.5rem',
                     padding: '8px 16px',
                     border: 'none',
                     borderRadius: '4px',
@@ -1120,51 +1183,50 @@ function App() {
                     fontSize: '14px',
                     fontWeight: 'bold',
                     cursor: 'pointer',
-                    transition: 'background 0.3s ease',
-                    flex: 1
+                    transition: 'background 0.3s ease'
+                  }}
+                >
+                  Hex ← Base64
+                </button>
+              </div>
+              
+              <div className="form-group" style={{ flex: 1 }}>
+                <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>Hex 输入</label>
+                <textarea 
+                  value={hexInput} 
+                  onChange={(e) => setHexInput(e.target.value)}
+                  placeholder="输入 hex 字符串" 
+                  style={{ 
+                    height: '150px',
+                    width: '100%',
+                    padding: '10px',
+                    border: '1px solid #333',
+                    borderRadius: '4px',
+                    backgroundColor: '#1e1e1e',
+                    color: '#e0e0e0',
+                    fontSize: '14px',
+                    resize: 'vertical'
+                  }}
+                />
+                <button 
+                  onClick={handleHexToBase64}
+                  style={{
+                    marginTop: '0.5rem',
+                    padding: '8px 16px',
+                    border: 'none',
+                    borderRadius: '4px',
+                    background: '#f59e0b',
+                    color: '#121212',
+                    fontSize: '14px',
+                    fontWeight: 'bold',
+                    cursor: 'pointer',
+                    transition: 'background 0.3s ease'
                   }}
                 >
                   Base64 ← Hex
                 </button>
               </div>
             </div>
-            
-            <div className="form-group" style={{ flex: 1 }}>
-              <label style={{ display: 'block', marginBottom: '5px', color: '#e0e0e0' }}>Base64 输入</label>
-              <textarea 
-                value={base64Input} 
-                onChange={(e) => setBase64Input(e.target.value)}
-                placeholder="输入 Base64 字符串" 
-                style={{ 
-                  height: '200px',
-                  width: '100%',
-                  padding: '10px',
-                  border: '1px solid #333',
-                  borderRadius: '4px',
-                  backgroundColor: '#2d2d2d',
-                  color: '#e0e0e0',
-                  fontSize: '14px',
-                  resize: 'vertical'
-                }}
-              />
-              <button 
-                onClick={handleBase64ToHex}
-                style={{
-                  marginTop: '0.5rem',
-                  padding: '8px 16px',
-                  border: 'none',
-                  borderRadius: '4px',
-                  background: '#f59e0b',
-                  color: '#121212',
-                  fontSize: '14px',
-                  fontWeight: 'bold',
-                  cursor: 'pointer',
-                  transition: 'background 0.3s ease'
-                }}
-              >
-                Hex ← Base64
-              </button>
-            </div>
           </div>
         </div>
       )}
@@ -1172,23 +1234,41 @@ function App() {
       {/* 证书工具面板 */}
       {activeTab === 'cert' && (
         <div className="panel" style={{ backgroundColor: '#1e1e1e', padding: '20px', borderRadius: '8px', boxShadow: '0 2px 4px rgba(0, 0, 0, 0.3)' }}>
-          <h2 style={{ color: '#f59e0b', marginBottom: '20px' }}>SM2 证书信息解析</h2>
+          <h2 style={{ color: '#f59e0b', marginBottom: '20px' }}>RSA 证书解析</h2>
           
           <div className="form-group" style={{ marginBottom: '20px' }}>
             <label style={{ display: 'block', marginBottom: '10px', color: '#e0e0e0' }}>上传证书文件</label>
-            <input 
-              type="file" 
-              accept=".cer,.crt,.pem" 
-              onChange={handleCertFileUpload}
-              style={{
-                padding: '10px',
+            <div style={{ position: 'relative', display: 'inline-block', width: '100%' }}>
+              <input 
+                type="file" 
+                accept=".cer,.crt,.pem" 
+                onChange={handleCertFileUpload}
+                style={{
+                  position: 'absolute',
+                  opacity: 0,
+                  width: '100%',
+                  height: '100%',
+                  cursor: 'pointer'
+                }}
+              />
+              <div style={{
+                padding: '12px 20px',
                 border: '1px solid #333',
                 borderRadius: '4px',
                 backgroundColor: '#2d2d2d',
-                color: '#e0e0e0',
-                cursor: 'pointer'
-              }}
-            />
+                color: '#f59e0b',
+                fontSize: '16px',
+                fontWeight: 'bold',
+                textAlign: 'center',
+                cursor: 'pointer',
+                transition: 'background 0.3s ease'
+              }}>
+                选择证书文件
+              </div>
+            </div>
+            <div style={{ marginTop: '10px', color: '#888', fontSize: '14px' }}>
+              支持 .cer, .crt, .pem 格式
+            </div>
           </div>
           
           {certInfo && (
diff --git a/src/utils/algorithm/cert.ts b/src/utils/algorithm/cert.ts
index 432f45e..c3b7a7d 100644
--- a/src/utils/algorithm/cert.ts
+++ b/src/utils/algorithm/cert.ts
@@ -1,14 +1,28 @@
 import forge from 'node-forge'
 
+// 将ArrayBuffer转换为Base64字符串（浏览器兼容）
+const arrayBufferToBase64 = (buffer: ArrayBuffer): string => {
+  const bytes = new Uint8Array(buffer)
+  let binary = ''
+  for (let i = 0; i < bytes.byteLength; i++) {
+    binary += String.fromCharCode(bytes[i])
+  }
+  return btoa(binary)
+}
+
 // 解析SM2证书信息
 export const parseSm2Cert = (certData: string): any => {
   try {
     // 移除证书中的换行符和空格
     const cleanCert = certData.replace(/\s/g, '')
     
-    // 解析DER编码的证书
-    const derBuffer = Buffer.from(cleanCert, 'base64')
-    const asn1 = forge.asn1.fromDer(derBuffer.toString('binary'))
+    // 解析DER编码的证书（浏览器兼容）
+    const binary = atob(cleanCert)
+    const derBuffer = new Uint8Array(binary.length)
+    for (let i = 0; i < binary.length; i++) {
+      derBuffer[i] = binary.charCodeAt(i)
+    }
+    const asn1 = forge.asn1.fromDer(String.fromCharCode(...derBuffer))
     const cert = forge.pki.certificateFromAsn1(asn1)
     
     // 提取证书信息
@@ -27,16 +41,20 @@ export const parseSm2Cert = (certData: string): any => {
     })
     
     // 提取公钥信息
-    const publicKey = cert.publicKey
     let publicKeyHex = ''
     
     // 尝试获取公钥的十六进制表示
     try {
-      if (typeof publicKey === 'object' && publicKey !== null) {
+      if (cert.publicKey) {
         // 尝试将公钥转换为PEM格式，然后提取十六进制
-        const pem = forge.pki.publicKeyToPem(publicKey)
-        // 从PEM中提取十六进制
-        publicKeyHex = pem.replace(/-----BEGIN PUBLIC KEY-----|-----END PUBLIC KEY-----|\s/g, '')
+        try {
+          const pem = forge.pki.publicKeyToPem(cert.publicKey)
+          // 从PEM中提取十六进制
+          publicKeyHex = pem.replace(/-----BEGIN PUBLIC KEY-----|-----END PUBLIC KEY-----|\s/g, '')
+        } catch (e) {
+          // 如果无法转换为PEM，使用空字符串
+          publicKeyHex = ''
+        }
       }
     } catch (e) {
       // 如果转换失败，使用空字符串
@@ -69,6 +87,5 @@ export const parseSm2Cert = (certData: string): any => {
 
 // 从文件内容解析证书
 export const parseCertFromFile = (fileContent: ArrayBuffer): string => {
-  const buffer = Buffer.from(fileContent)
-  return buffer.toString('base64')
+  return arrayBufferToBase64(fileContent)
 }
diff --git a/src/version.js b/src/version.js
index c2f3aac..df9d45e 100644
--- a/src/version.js
+++ b/src/version.js
@@ -1 +1 @@
-export const VERSION = "V1.0-20260418071243";
\ No newline at end of file
+export const VERSION = "V1.0-20260418075022";
\ No newline at end of file