diff --git a/app/src/main/assets/help/jsHelp.md b/app/src/main/assets/help/jsHelp.md
index 61531c215..f5c43e30d 100644
--- a/app/src/main/assets/help/jsHelp.md
+++ b/app/src/main/assets/help/jsHelp.md
@@ -131,18 +131,28 @@ java.getZipStringContent(url: String, path: String)
 * base64
 > flags参数可省略，默认Base64.NO_WRAP，查看[flags参数说明](https://blog.csdn.net/zcmain/article/details/97051870)
 ```
-java.base64Decode(str: String, flags: Int)
+java.base64Decode(str: String)
+java.base64Decode(str: String, charset: String)
 java.base64DecodeToByteArray(str: String, flags: Int)
 java.base64Encode(str: String, flags: Int)
 ```
+* ByteArray
+```
+Str转Bytes
+java.strToBytes(str: String)
+java.strToBytes(str: String, charset: String)
+Bytes转Str
+java.bytesToStr(bytes: ByteArray)
+java.bytesToStr(bytes: ByteArray, charset: String)
+```
 * Hex
 ```
-/* HexString 解码为字节数组 */
-hexDecodeToByteArray(hex: String): ByteArray?
-/* hexString 解码为utf8String*/
-hexDecodeToString(hex: String): String?
-/* utf8 编码为hexString */
-hexEncodeToString(utf8: String): String?
+HexString 解码为字节数组
+java.hexDecodeToByteArray(hex: String)
+hexString 解码为utf8String
+java.hexDecodeToString(hex: String)
+utf8 编码为hexString
+java.hexEncodeToString(utf8: String)
 ```
 * 文件
 >  所有对于文件的读写删操作都是相对路径,只能操作阅读缓存/android/data/{package}/cache/内的文件
diff --git a/app/src/main/java/io/legado/app/help/JsExtensions.kt b/app/src/main/java/io/legado/app/help/JsExtensions.kt
index 4f9d91343..d1e6460bf 100644
--- a/app/src/main/java/io/legado/app/help/JsExtensions.kt
+++ b/app/src/main/java/io/legado/app/help/JsExtensions.kt
@@ -1,8 +1,8 @@
 package io.legado.app.help
 
 import android.net.Uri
-import android.util.Base64
 import androidx.annotation.Keep
+import cn.hutool.core.codec.Base64
 import cn.hutool.core.util.HexUtil
 import io.legado.app.constant.AppConst
 import io.legado.app.constant.AppConst.dateFormat
@@ -313,12 +313,34 @@ interface JsExtensions : JsEncodeUtils {
         }
         return response
     }
+    
+    /* Str转ByteArray */
+    fun strToBytes(str: String): ByteArray {
+        return str.toByteArray(charset("UTF-8"))
+    }
+    
+    fun strToBytes(str: String, charset: String): ByteArray {
+        return str.toByteArray(charset(charset))
+    }
+    
+    /* ByteArray转Str */
+    fun bytesToStr(bytes: ByteArray): String {
+        return String(bytes, charset("UTF-8"))
+    }
+    
+    fun bytesToStr(bytes: ByteArray, charset: String): String {
+        return String(bytes, charset(charset))
+    }
 
     /**
      * js实现base64解码,不能删
      */
-    fun base64Decode(str: String): String {
-        return EncoderUtils.base64Decode(str, Base64.NO_WRAP)
+    fun base64Decode(str: String?): String {
+        return Base64.decodeStr(str)
+    }
+    
+    fun base64Decode(str: String?, charset: String): String {
+        return Base64.decodeStr(str, charset(charset))
     }
 
     fun base64Decode(str: String, flags: Int): String {
@@ -329,18 +351,18 @@ interface JsExtensions : JsEncodeUtils {
         if (str.isNullOrBlank()) {
             return null
         }
-        return Base64.decode(str, Base64.DEFAULT)
+        return EncoderUtils.base64DecodeToByteArray(str, 0)
     }
 
     fun base64DecodeToByteArray(str: String?, flags: Int): ByteArray? {
         if (str.isNullOrBlank()) {
             return null
         }
-        return Base64.decode(str, flags)
+        return EncoderUtils.base64DecodeToByteArray(str, flags)
     }
 
     fun base64Encode(str: String): String? {
-        return EncoderUtils.base64Encode(str, Base64.NO_WRAP)
+        return EncoderUtils.base64Encode(str, 2)
     }
 
     fun base64Encode(str: String, flags: Int): String? {
diff --git a/app/src/main/java/io/legado/app/utils/EncoderUtils.kt b/app/src/main/java/io/legado/app/utils/EncoderUtils.kt
index fec85ff2c..54c528f03 100644
--- a/app/src/main/java/io/legado/app/utils/EncoderUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/EncoderUtils.kt
@@ -37,5 +37,10 @@ object EncoderUtils {
     fun base64Encode(str: String, flags: Int = Base64.NO_WRAP): String? {
         return Base64.encodeToString(str.toByteArray(), flags)
     }
+    
+    @JvmOverloads
+    fun base64DecodeToByteArray(str: String, flags: Int = Base64.DEFAULT): ByteArray {
+        return Base64.decode(str, flags)
+    }
 
 }