diff --git a/lib/arb/intl_en.arb b/lib/arb/intl_en.arb
index 562fcde..bcb95f2 100755
--- a/lib/arb/intl_en.arb
+++ b/lib/arb/intl_en.arb
@@ -101,9 +101,12 @@
   "caseSensitive": "Case sensitive",
   "isRegex": "Is regex",
   "language": "Language: ",
-  "selectionLength": "Selection length",
+  "indexOne": "First character index",
+  "indexTwo": "Second character index",
+  "toLast": "-to-last",
   "goingForward": "Going forward",
-  "keepCharacters": "Keep characters",
+  "keepCharacters": "Keep characters between them",
+  "removeCharacters": "Remove characters between them",
   "metadataParserNotProvided": "Contains metadata tag while MetadataParser was not provided.",
   "replaceToString": "Replace \"{targetString}\" with \"{replacementString}\".",
   "@replaceToString": {
@@ -176,22 +179,22 @@
       }
     }
   },
-  "truncateToString": "Truncate: {keepType, plural, =0{remove} =1{keep} other{}} {length} characters starting from the char #{startIndex}{location, plural, =0{-to-end} =1{} other{}} going {direction, plural, =0{backward} =1{forward} other{}}.",
+  "truncateToString": "Truncate: {keepType, plural, =0{keep only} =1{remove} other{}} characters between the {i1}th{i1toEnd, plural, =0{-to-end} =1{} other{}} character and the {i2}th{i2toEnd, plural, =0{-to-end} =1{} other{}}.",
   "@truncateToString": {
     "placeholders": {
       "keepType": {
         "type": "num"
       },
-      "location":{
+      "i1toEnd":{
         "type": "num"
       },
-      "direction":{
+      "i2toEnd":{
         "type": "num"
       },
-      "length": {
+      "i1": {
         "type": "num"
       },
-      "startIndex": {
+      "i2": {
         "type": "num"
       }
     }
diff --git a/lib/arb/intl_zh.arb b/lib/arb/intl_zh.arb
index 3f07858..60c418c 100644
--- a/lib/arb/intl_zh.arb
+++ b/lib/arb/intl_zh.arb
@@ -101,9 +101,13 @@
   "caseSensitive": "区分大小写",
   "isRegex": "使用正则表达式",
   "language": "语言：",
+  "indexOne": "第一处位置",
+  "indexTwo": "第二处位置",
+  "toLast": "倒数",
   "selectionLength": "所选内容长度",
   "goingForward": "向前",
-  "keepCharacters": "保留字符",
+  "keepCharacters": "保留二者之间的字符",
+  "removeCharacters": "移除二者之间的字符",
   "metadataParserNotProvided": "包含元数据标签，但未提供元数据解析器。",
   "replaceToString": "替换：将“{targetString}”替换为“{replacementString}”。",
   "@replaceToString": {
@@ -176,22 +180,22 @@
       }
     }
   },
-  "truncateToString": "截取：从{location, plural, =0{倒数的} =1{} other{}}第{startIndex}个字符开始，向{direction, plural, =0{后} =1{前} other{other}}{keepType, plural, =0{移除} =1{保留} other{other}}{length}个字符。",
+  "truncateToString": "截取：{keepType, plural, =0{仅保留} =1{移除} other{}}从{i1toEnd, plural, =0{倒数的} =1{} other{}}第{i1}个字符至{i2toEnd, plural, =0{倒数的} =1{} other{}}第{i2}个字符之间的内容。",
   "@truncateToString": {
     "placeholders": {
       "keepType": {
         "type": "num"
       },
-      "location":{
+      "i1toEnd":{
         "type": "num"
       },
-      "direction":{
+      "i2toEnd":{
         "type": "num"
       },
-      "length": {
+      "i1": {
         "type": "num"
       },
-      "startIndex": {
+      "i2": {
         "type": "num"
       }
     }
diff --git a/lib/dialogs/truncate_dialog.dart b/lib/dialogs/truncate_dialog.dart
index bef4312..6815300 100644
--- a/lib/dialogs/truncate_dialog.dart
+++ b/lib/dialogs/truncate_dialog.dart
@@ -23,16 +23,12 @@ class TruncateDialog extends StatefulWidget {
 }
 
 class _TruncateDialogState extends State<TruncateDialog> {
-  TextEditingController startController = TextEditingController(
-    text: '0',
-  );
-  TextEditingController lengthController = TextEditingController(
-    text: '0',
-  );
-  bool fromStart = true; // true: count from start, false: count from end.
-  bool direction = true; // truncate direction
+  TextEditingController i1Controller = TextEditingController(text: '0');
+  TextEditingController i2Controller = TextEditingController(text: '0');
+  bool i1toEnd = false; // true: negative (Xth-to-last), false: positive (Xth)
+  bool i2toEnd = false; // true: negative (Xth-to-last), false: positive (Xth)
   bool ignoreExtension = true;
-  bool keep = true; // true: keep chars in ranges, false: remove in range
+  bool keepBetween = true; // true: keep chars in ranges, false: remove in range
 
   @override
   Widget build(BuildContext context) {
@@ -41,50 +37,62 @@ class _TruncateDialogState extends State<TruncateDialog> {
       content: SingleChildScrollView(
         child: Column(
           mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            TextFormField(
-              controller: startController,
-              keyboardType: TextInputType.number,
-              inputFormatters: <TextInputFormatter>[
-                FilteringTextInputFormatter.allow(RegExp('[0-9]')), // 只允许数字
+            Row(
+              children: [
+                Expanded(child: TextFormField(
+                  controller: i1Controller,
+                  keyboardType: TextInputType.number,
+                  inputFormatters: <TextInputFormatter>[
+                    FilteringTextInputFormatter.allow(RegExp('[0-9]')), // 只允许数字
+                  ],
+                  decoration: InputDecoration(labelText: L10n.current.indexOne),
+                ),),
+                TextButton(
+                  child: Text(L10n.current.toLast, style: TextStyle(
+                    color: i1toEnd ? null : Colors.grey,
+                  ),),
+                  onPressed: () {
+                    setState(() {
+                      i1toEnd = !i1toEnd;
+                    });
+                  },
+                ),
               ],
-              decoration: InputDecoration(labelText: L10n.current.startIndex),
             ),
             box,
-            TextFormField(
-              controller: lengthController,
-              keyboardType: TextInputType.number,
-              inputFormatters: <TextInputFormatter>[
-                FilteringTextInputFormatter.allow(RegExp('[0-9]')), // 只允许数字
+            Row(
+              children: [
+                Expanded(child: TextFormField(
+                  controller: i2Controller,
+                  keyboardType: TextInputType.number,
+                  inputFormatters: <TextInputFormatter>[
+                    FilteringTextInputFormatter.allow(RegExp('[0-9]')), // 只允许数字
+                  ],
+                  decoration: InputDecoration(labelText: L10n.current.indexTwo),
+                ),),
+                TextButton(
+                  child: Text(L10n.current.toLast, style: TextStyle(
+                    color: i2toEnd ? null : Colors.grey,
+                  ),),
+                  onPressed: () {
+                    setState(() {
+                      i2toEnd = !i2toEnd;
+                    });
+                  },
+                ),
               ],
-              decoration: InputDecoration(labelText: L10n.current.selectionLength),
             ),
-            CheckboxTile(
-              title: Text(L10n.current.fromStart),
-              value: fromStart,
-              onChanged: (value) {
-                setState(() {
-                  fromStart = value ?? fromStart;
-                });
-              },
-            ),
-            CheckboxTile(
-              title: Text(L10n.current.goingForward),
-              value: direction,
-              onChanged: (value) {
-                setState(() {
-                  direction = value ?? direction;
-                });
-              },
-            ),
-            CheckboxTile(
-              title: Text(L10n.current.keepCharacters),
-              value: keep,
-              onChanged: (value) {
-                setState(() {
-                  keep = value ?? keep;
-                });
-              },
+            ListTile(
+              title: TextButton(
+                child: Text(keepBetween ? L10n.current.keepCharacters : L10n.current.removeCharacters),
+                onPressed: () {
+                  setState(() {
+                    keepBetween = !keepBetween;
+                  });
+                },
+              ),
             ),
             CheckboxTile(
               title: Text(L10n.current.ignoreExtension),
@@ -107,16 +115,16 @@ class _TruncateDialogState extends State<TruncateDialog> {
         ),
         TextButton(
           onPressed: () {
-            int startIndex = int.tryParse(startController.text) ?? 0;
-            int length = int.tryParse(lengthController.text) ?? 0;
+            int index1 = int.tryParse(i1Controller.text) ?? 0;
+            int index2 = int.tryParse(i2Controller.text) ?? 0;
 
             final Rule rule = RuleTruncate(
-              startIndex,
-              fromStart,
-              direction,
-              length,
+              index1,
+              index2,
+              i1toEnd,
+              i2toEnd,
               ignoreExtension,
-              keep,
+              keepBetween,
             );
 
             widget.onSave.call(rule);
diff --git a/lib/l10n/intl/messages_en.dart b/lib/l10n/intl/messages_en.dart
index a6138ba..c8b37e0 100644
--- a/lib/l10n/intl/messages_en.dart
+++ b/lib/l10n/intl/messages_en.dart
@@ -38,8 +38,8 @@ class MessageLookup extends MessageLookupByLibrary {
   static String m6(langName, type) =>
       "Transliterate: convert ${langName} ${type}.";
 
-  static String m7(keepType, location, direction, length, startIndex) =>
-      "Truncate: ${Intl.plural(keepType, zero: 'remove', one: 'keep', other: '')} ${length} characters starting from the char #${startIndex}${Intl.plural(location, zero: '-to-end', one: '', other: '')} going ${Intl.plural(direction, zero: 'backward', one: 'forward', other: '')}.";
+  static String m7(keepType, i1toEnd, i2toEnd, i1, i2) =>
+      "Truncate: ${Intl.plural(keepType, zero: 'keep only', one: 'remove', other: '')} characters between the ${i1}th${Intl.plural(i1toEnd, zero: '-to-end', one: '', other: '')} character and the ${i2}th${Intl.plural(i2toEnd, zero: '-to-end', one: '', other: '')}.";
 
   final messages = _notInlinedMessages(_notInlinedMessages);
   static Map<String, Function> _notInlinedMessages(_) => <String, Function>{
@@ -96,6 +96,10 @@ class MessageLookup extends MessageLookupByLibrary {
         "incrementToString": m0,
         "indexIncrementalStep":
             MessageLookupByLibrary.simpleMessage("Index incremental step"),
+        "indexOne":
+            MessageLookupByLibrary.simpleMessage("First character index"),
+        "indexTwo":
+            MessageLookupByLibrary.simpleMessage("Second character index"),
         "insert": MessageLookupByLibrary.simpleMessage("Insert"),
         "insertBeforeIndex":
             MessageLookupByLibrary.simpleMessage("Insert before index"),
@@ -106,8 +110,8 @@ class MessageLookup extends MessageLookupByLibrary {
         "insertedText":
             MessageLookupByLibrary.simpleMessage("Text to be inserted"),
         "isRegex": MessageLookupByLibrary.simpleMessage("Is regex"),
-        "keepCharacters":
-            MessageLookupByLibrary.simpleMessage("Keep characters"),
+        "keepCharacters": MessageLookupByLibrary.simpleMessage(
+            "Keep characters between them"),
         "language": MessageLookupByLibrary.simpleMessage("Language: "),
         "limit": MessageLookupByLibrary.simpleMessage("limit"),
         "lowercaseAppName": MessageLookupByLibrary.simpleMessage("renamer"),
@@ -173,6 +177,8 @@ class MessageLookup extends MessageLookupByLibrary {
         "rearrangeToString": m2,
         "remove": MessageLookupByLibrary.simpleMessage("Remove"),
         "removeAll": MessageLookupByLibrary.simpleMessage("Remove all"),
+        "removeCharacters": MessageLookupByLibrary.simpleMessage(
+            "Remove characters between them"),
         "removeRenamed": MessageLookupByLibrary.simpleMessage("Remove renamed"),
         "removeRules":
             MessageLookupByLibrary.simpleMessage("Remove rules after renaming"),
@@ -184,13 +190,12 @@ class MessageLookup extends MessageLookupByLibrary {
         "ru": MessageLookupByLibrary.simpleMessage("Russian"),
         "save": MessageLookupByLibrary.simpleMessage("Save"),
         "selectAll": MessageLookupByLibrary.simpleMessage("Select All"),
-        "selectionLength":
-            MessageLookupByLibrary.simpleMessage("Selection length"),
         "sourceCode": MessageLookupByLibrary.simpleMessage("Source code"),
         "sr": MessageLookupByLibrary.simpleMessage("Serbian"),
         "startIndex": MessageLookupByLibrary.simpleMessage("Start index"),
         "target": MessageLookupByLibrary.simpleMessage("target"),
         "tj": MessageLookupByLibrary.simpleMessage("Tajik"),
+        "toLast": MessageLookupByLibrary.simpleMessage("-to-last"),
         "transliterate": MessageLookupByLibrary.simpleMessage("Transliterate"),
         "transliterateCyrillic2Latin": MessageLookupByLibrary.simpleMessage(
             "Cyrillic characters to Latin"),
diff --git a/lib/l10n/intl/messages_zh.dart b/lib/l10n/intl/messages_zh.dart
index 20c489b..b2ac909 100644
--- a/lib/l10n/intl/messages_zh.dart
+++ b/lib/l10n/intl/messages_zh.dart
@@ -36,8 +36,8 @@ class MessageLookup extends MessageLookupByLibrary {
 
   static String m6(langName, type) => "转写：将${langName}${type}。";
 
-  static String m7(keepType, location, direction, length, startIndex) =>
-      "截取：从${Intl.plural(location, zero: '倒数的', one: '', other: '')}第${startIndex}个字符开始，向${Intl.plural(direction, zero: '后', one: '前', other: 'other')}${Intl.plural(keepType, zero: '移除', one: '保留', other: 'other')}${length}个字符。";
+  static String m7(keepType, i1toEnd, i2toEnd, i1, i2) =>
+      "截取：${Intl.plural(keepType, zero: '仅保留', one: '移除', other: '')}从${Intl.plural(i1toEnd, zero: '倒数的', one: '', other: '')}第${i1}个字符至${Intl.plural(i2toEnd, zero: '倒数的', one: '', other: '')}第${i2}个字符之间的内容。";
 
   final messages = _notInlinedMessages(_notInlinedMessages);
   static Map<String, Function> _notInlinedMessages(_) => <String, Function>{
@@ -85,6 +85,8 @@ class MessageLookup extends MessageLookupByLibrary {
         "increment": MessageLookupByLibrary.simpleMessage("递增"),
         "incrementToString": m0,
         "indexIncrementalStep": MessageLookupByLibrary.simpleMessage("索引递增量"),
+        "indexOne": MessageLookupByLibrary.simpleMessage("第一处位置"),
+        "indexTwo": MessageLookupByLibrary.simpleMessage("第二处位置"),
         "insert": MessageLookupByLibrary.simpleMessage("插入"),
         "insertBeforeIndex": MessageLookupByLibrary.simpleMessage("在插入位置前侧插入"),
         "insertIndex": MessageLookupByLibrary.simpleMessage("插入位置"),
@@ -93,7 +95,7 @@ class MessageLookup extends MessageLookupByLibrary {
         "insertToString": m1,
         "insertedText": MessageLookupByLibrary.simpleMessage("要插入的文本"),
         "isRegex": MessageLookupByLibrary.simpleMessage("使用正则表达式"),
-        "keepCharacters": MessageLookupByLibrary.simpleMessage("保留字符"),
+        "keepCharacters": MessageLookupByLibrary.simpleMessage("保留二者之间的字符"),
         "language": MessageLookupByLibrary.simpleMessage("语言："),
         "limit": MessageLookupByLibrary.simpleMessage("次数"),
         "lowercaseAppName": MessageLookupByLibrary.simpleMessage("批量重命名"),
@@ -146,6 +148,7 @@ class MessageLookup extends MessageLookupByLibrary {
         "rearrangeToString": m2,
         "remove": MessageLookupByLibrary.simpleMessage("删除"),
         "removeAll": MessageLookupByLibrary.simpleMessage("移除全部"),
+        "removeCharacters": MessageLookupByLibrary.simpleMessage("移除二者之间的字符"),
         "removeRenamed": MessageLookupByLibrary.simpleMessage("移除已重命名文件"),
         "removeRules": MessageLookupByLibrary.simpleMessage("重命名后移除所有规则"),
         "removeToString": m3,
@@ -156,12 +159,12 @@ class MessageLookup extends MessageLookupByLibrary {
         "ru": MessageLookupByLibrary.simpleMessage("俄语"),
         "save": MessageLookupByLibrary.simpleMessage("保存"),
         "selectAll": MessageLookupByLibrary.simpleMessage("全选"),
-        "selectionLength": MessageLookupByLibrary.simpleMessage("所选内容长度"),
         "sourceCode": MessageLookupByLibrary.simpleMessage("源代码"),
         "sr": MessageLookupByLibrary.simpleMessage("塞尔维亚语"),
         "startIndex": MessageLookupByLibrary.simpleMessage("起始索引"),
         "target": MessageLookupByLibrary.simpleMessage("目标"),
         "tj": MessageLookupByLibrary.simpleMessage("塔吉克语"),
+        "toLast": MessageLookupByLibrary.simpleMessage("倒数"),
         "transliterate": MessageLookupByLibrary.simpleMessage("转写"),
         "transliterateCyrillic2Latin":
             MessageLookupByLibrary.simpleMessage("从西里尔字符转为拉丁字符"),
diff --git a/lib/l10n/l10n.dart b/lib/l10n/l10n.dart
index af59189..4cc479d 100644
--- a/lib/l10n/l10n.dart
+++ b/lib/l10n/l10n.dart
@@ -1060,11 +1060,31 @@ class L10n {
     );
   }
 
-  /// `Selection length`
-  String get selectionLength {
+  /// `First character index`
+  String get indexOne {
     return Intl.message(
-      'Selection length',
-      name: 'selectionLength',
+      'First character index',
+      name: 'indexOne',
+      desc: '',
+      args: [],
+    );
+  }
+
+  /// `Second character index`
+  String get indexTwo {
+    return Intl.message(
+      'Second character index',
+      name: 'indexTwo',
+      desc: '',
+      args: [],
+    );
+  }
+
+  /// `-to-last`
+  String get toLast {
+    return Intl.message(
+      '-to-last',
+      name: 'toLast',
       desc: '',
       args: [],
     );
@@ -1080,16 +1100,26 @@ class L10n {
     );
   }
 
-  /// `Keep characters`
+  /// `Keep characters between them`
   String get keepCharacters {
     return Intl.message(
-      'Keep characters',
+      'Keep characters between them',
       name: 'keepCharacters',
       desc: '',
       args: [],
     );
   }
 
+  /// `Remove characters between them`
+  String get removeCharacters {
+    return Intl.message(
+      'Remove characters between them',
+      name: 'removeCharacters',
+      desc: '',
+      args: [],
+    );
+  }
+
   /// `Contains metadata tag while MetadataParser was not provided.`
   String get metadataParserNotProvided {
     return Intl.message(
@@ -1170,14 +1200,14 @@ class L10n {
     );
   }
 
-  /// `Truncate: {keepType, plural, =0{remove} =1{keep} other{}} {length} characters starting from the char #{startIndex}{location, plural, =0{-to-end} =1{} other{}} going {direction, plural, =0{backward} =1{forward} other{}}.`
+  /// `Truncate: {keepType, plural, =0{keep only} =1{remove} other{}} characters between the {i1}th{i1toEnd, plural, =0{-to-end} =1{} other{}} character and the {i2}th{i2toEnd, plural, =0{-to-end} =1{} other{}}.`
   String truncateToString(
-      num keepType, num location, num direction, num length, num startIndex) {
+      num keepType, num i1toEnd, num i2toEnd, num i1, num i2) {
     return Intl.message(
-      'Truncate: ${Intl.plural(keepType, zero: 'remove', one: 'keep', other: '')} $length characters starting from the char #$startIndex${Intl.plural(location, zero: '-to-end', one: '', other: '')} going ${Intl.plural(direction, zero: 'backward', one: 'forward', other: '')}.',
+      'Truncate: ${Intl.plural(keepType, zero: 'keep only', one: 'remove', other: '')} characters between the ${i1}th${Intl.plural(i1toEnd, zero: '-to-end', one: '', other: '')} character and the ${i2}th${Intl.plural(i2toEnd, zero: '-to-end', one: '', other: '')}.',
       name: 'truncateToString',
       desc: '',
-      args: [keepType, location, direction, length, startIndex],
+      args: [keepType, i1toEnd, i2toEnd, i1, i2],
     );
   }
 
diff --git a/lib/rules/rule_truncate.dart b/lib/rules/rule_truncate.dart
index 26c87d7..d0fb26d 100644
--- a/lib/rules/rule_truncate.dart
+++ b/lib/rules/rule_truncate.dart
@@ -2,56 +2,45 @@ part of 'rule.dart';
 
 class RuleTruncate implements Rule {
   RuleTruncate(
-    this.startIndex,
-    this.fromStart,
-    this.direction,
-    this.length,
+    this.index1,
+    this.index2,
+    this.i1toEnd,
+    this.i2toEnd,
     this.ignoreExtension,
-    this.keep,
+    this.keepBetween,
   );
 
-  final int startIndex; // count from
-  final bool fromStart; // true: count from start, false: count from end.
-  final bool direction; // truncate direction
-  final int length; // truncate length
+  final int index1;
+  final int index2;
+  final bool i1toEnd;
+  final bool i2toEnd;
   final bool ignoreExtension;
-  final bool keep; // true: keep chars in ranges, false: keep out of range
+  final bool keepBetween; // true: keep chars between 2 indexes, false: keep chars around them
 
   @override
   String newName(String oldName, {FileMetadata? metadata}) {
     String newName, extension;
     (newName, extension) = splitFileName(oldName, ignoreExtension);
 
-    int index = startIndex;
+    int start = index1;
 
-    if (!fromStart) {
-      index = newName.length - index + 1;
+    if (i1toEnd) {
+      start = newName.length + start;
     }
 
-    int start;
-    int end;
+    int end = index2;
 
-    if (direction) {
-      start = index - 1;
-      end = index + length - 1;
-    } else {
-      start = index - length;
-      end = index;
-    }
-
-    if (start < 0) {
-      start = 0;
-    } else if (start >= newName.length) {
-      start = newName.length;
+    if (i2toEnd) {
+      end = newName.length + end;
     }
 
-    if (end < 0) {
-      end = 0;
-    } else if (end >= newName.length) {
-      end = newName.length;
+    if (start > end) {
+      final temp = start;
+      start = end;
+      end = temp;
     }
 
-    if (keep) {
+    if (keepBetween) {
       newName = newName.substring(start, end);
     } else {
       newName = newName.replaceRange(start, end, '');
@@ -63,11 +52,11 @@ class RuleTruncate implements Rule {
   @override
   String toString() {
     return L10n.current.truncateToString(
-      keep ? 1 : 0,
-      fromStart ? 1 : 0,
-      direction ? 1 : 0,
-      length,
-      startIndex,
+      keepBetween ? 0 : 1,
+      i1toEnd ? 0 : 1,
+      i2toEnd ? 0 : 1,
+      index1,
+      index2,
     );
   }
 }