diff --git a/main.go b/main.go
index d87af73..791facb 100644
--- a/main.go
+++ b/main.go
@@ -12,8 +12,9 @@ import (
 )
 
 const (
-	port     = ":8080"
-	filesDir = "./files"
+	port        = ":8080"
+	filesDir    = "./files"
+	maxFileSize = 20 * 1024 * 1024 // 20MiB
 )
 
 var url string = os.Getenv("URL")
@@ -41,9 +42,11 @@ func uploadHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	r.Body = http.MaxBytesReader(w, r.Body, maxFileSize)
+
 	file, _, err := r.FormFile("file")
 	if err != nil {
-		http.Error(w, "Error retrieving the file", http.StatusBadRequest)
+		http.Error(w, "Error retrieving the file or file size exceeds limit", http.StatusBadRequest)
 		return
 	}
 	defer file.Close()