diff --git a/src/config.ts b/src/config.ts
index 495635b..1ec695b 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -148,6 +148,7 @@ export interface PromptConfig {
   placement?: Computed<'before' | 'after'>
   latinOnly?: Computed<boolean>
   translator?: boolean
+  lowerCase?: boolean
   maxWords?: Computed<number>
 }
 
@@ -163,6 +164,7 @@ export const PromptConfig: Schema<PromptConfig> = Schema.object({
   ]), options).description('默认附加标签的位置。').default('after'),
   translator: Schema.boolean().description('是否启用自动翻译。').default(true),
   latinOnly: Schema.computed(Schema.boolean(), options).description('是否只接受英文输入。').default(false),
+  lowerCase: Schema.boolean().description('是否将输入的标签转换为小写。').default(true),
   maxWords: Schema.computed(Schema.natural(), options).description('允许的最大单词数量。').default(0),
 }).description('输入设置')
 
@@ -422,7 +424,8 @@ export function parseInput(session: Session, input: string, config: Config, over
     const tags = input.split(/,\s*/g)
     if (placement === 'before') tags.reverse()
     for (let tag of tags) {
-      tag = tag.trim().toLowerCase()
+      tag = tag.trim()
+      if (config.lowerCase) tag = tag.toLowerCase()
       if (!tag || words.includes(tag)) continue
       if (placement === 'before') {
         words.unshift(tag)