diff --git a/unitool.js b/unitool.js
index 28fcb5c..3816cd1 100644
--- a/unitool.js
+++ b/unitool.js
@@ -321,8 +321,14 @@ export default {
     }
 
     if (!fileSize) {
-      this.showToast({ type: this.c2t.YELLOW, title: this.localizeText({ zhCN: '文件为空，无法上传', enUS: 'Empty files cannot be uploaded' }) })
-      return { _state: 'CER_EMPTY_FILE' }
+      let _msg = { zhCN: '文件为空，无法上传。', enUS: 'Empty files cannot be uploaded.' }
+      this.showToast({ type: this.c2t.YELLOW, title: this.localizeText(_msg) })
+      return { _state: 'CER_EMPTY_FILE', _msg }
+    } else if (fileSize > (globalThis.wo?.envar?.fileSizeLimit || 10485760)) {
+      let sizeLimitMB = parseInt((globalThis.wo?.envar?.fileSizeLimit || 10485760) / 1048576) + 'MB'
+      let _msg = { zhCN: `文件太大了，无法上传。最大允许 ${sizeLimitMB}`, enUS: `File too large to upload. Maximum allowed is ${sizeLimitMB}` }
+      this.showToast({ type: this.c2t.YELLOW, title: this.localizeText(_msg) })
+      return { _state: 'CER_FILE_TOO_LARGE', _msg }
     }
 
     if (filePath) {
@@ -421,8 +427,14 @@ export default {
     }
 
     if (!fileSize) {
-      this.showToast({ type: this.c2t.YELLOW, title: this.localizeText({ zhCN: '文件为空，无法上传', enUS: 'Empty files cannot be uploaded' }) })
-      return { _state: 'CER_EMPTY_FILE' }
+      let _msg = { zhCN: '文件为空，无法上传。', enUS: 'Empty files cannot be uploaded.' }
+      this.showToast({ type: this.c2t.YELLOW, title: this.localizeText(_msg) })
+      return { _state: 'CER_EMPTY_FILE', _msg }
+    } else if (fileSize > (globalThis.wo?.envar?.fileSizeLimit || 10485760)) {
+      let sizeLimitMB = parseInt((globalThis.wo?.envar?.fileSizeLimit || 10485760) / 1048576) + 'MB'
+      let _msg = { zhCN: `文件太大了，无法上传。最大允许 ${sizeLimitMB}`, enUS: `File too large to upload. Maximum allowed is ${sizeLimitMB}` }
+      this.showToast({ type: this.c2t.YELLOW, title: this.localizeText(_msg) })
+      return { _state: 'CER_FILE_TOO_LARGE', _msg }
     }
 
     if (filePath) {