diff --git a/backend/internal/modules/listing/assets/default_upload_screenshot.webp b/backend/internal/modules/listing/assets/default_upload_screenshot.webp
new file mode 100644
index 0000000..27aebf9
Binary files /dev/null and b/backend/internal/modules/listing/assets/default_upload_screenshot.webp differ
diff --git a/backend/internal/modules/listing/handler_external.go b/backend/internal/modules/listing/handler_external.go
index d3331ea..a91655d 100644
--- a/backend/internal/modules/listing/handler_external.go
+++ b/backend/internal/modules/listing/handler_external.go
@@ -1,6 +1,7 @@
 package listing
 
 import (
+	_ "embed"
 	"crypto/hmac"
 	"crypto/sha256"
 	"encoding/hex"
@@ -18,6 +19,9 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+//go:embed assets/default_upload_screenshot.webp
+var defaultUploadScreenshotWebP []byte
+
 func (h *Handler) ImportExternalUpload(c *gin.Context) {
 	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, maxExternalUploadBodyBytes)
 	raw, err := io.ReadAll(c.Request.Body)
@@ -123,7 +127,8 @@ func writeExternalUploadAuthError(c *gin.Context, err error) {
 }
 
 func (h *Handler) DefaultUploadScreenshot(c *gin.Context) {
-	c.Header("Content-Type", "image/svg+xml; charset=utf-8")
-	c.Header("Cache-Control", "public, max-age=86400")
-	c.String(http.StatusOK, `<svg xmlns="http://www.w3.org/2000/svg" width="960" height="540" viewBox="0 0 960 540"><rect width="960" height="540" fill="#f3f4f6"/><rect x="72" y="72" width="816" height="396" rx="24" fill="#ffffff" stroke="#d1d5db" stroke-width="4"/><text x="480" y="248" text-anchor="middle" font-family="Arial, sans-serif" font-size="42" font-weight="700" fill="#374151">账号资料默认图</text><text x="480" y="310" text-anchor="middle" font-family="Arial, sans-serif" font-size="28" fill="#6b7280">开放接口上传，待后台补充审核</text></svg>`)
+	c.Header("Content-Type", "image/webp")
+	c.Header("Cache-Control", "public, max-age=604800")
+	c.Header("Content-Length", strconv.Itoa(len(defaultUploadScreenshotWebP)))
+	c.Data(http.StatusOK, "image/webp", defaultUploadScreenshotWebP)
 }