diff --git a/src/app/login/LoginWindow.cpp b/src/app/login/LoginWindow.cpp
index 8f2b076..cd9b192 100644
--- a/src/app/login/LoginWindow.cpp
+++ b/src/app/login/LoginWindow.cpp
@@ -250,10 +250,9 @@ void LoginWindow::refreshCaptcha()
                     pix.loadFromData(QByteArray::fromBase64(b64));
                 }
                 if (pix.isNull() && !cap.code.isEmpty()) pix = renderCaptchaPixmap(cap.code);
-                captchaLabel_->setPixmap(
-                    pix.isNull() ? pix
-                                 : pix.scaled(captchaLabel_->size(), Qt::KeepAspectRatio,
-                                              Qt::SmoothTransformation));
+                // 原尺寸显示（后端图约 88x40），不再放大缩放——放大会糊导致看错验证码字符。
+                captchaLabel_->setScaledContents(false);
+                captchaLabel_->setPixmap(pix);
                 refreshBtn_->setEnabled(true);
             });
     connect(l, &geopro::net::CaptchaLoad::failed, this, [this, l](const QString& msg) {