diff --git a/esphome/components/web_server_idf/web_server_idf.cpp b/esphome/components/web_server_idf/web_server_idf.cpp
index 694d7c5af7b..6527e2ef801 100644
--- a/esphome/components/web_server_idf/web_server_idf.cpp
+++ b/esphome/components/web_server_idf/web_server_idf.cpp
@@ -148,10 +148,9 @@ void AsyncWebServer::begin() {
   if (this->server_) {
     this->end();
   }
-  // Default httpd stack is defined by ESP-IDF. Increase to accommodate SerializationBuffer's
-  // 640-byte stack buffer used by web_server JSON request handlers.
+  // Allow room for SerializationBuffer's 640-byte stack buffer and HTTP request handling.
   httpd_config_t config = HTTPD_DEFAULT_CONFIG();
-  config.stack_size = config.stack_size + 256;
+  config.stack_size = 4512;
   config.server_port = this->port_;
   config.uri_match_fn = [](const char * /*unused*/, const char * /*unused*/, size_t /*unused*/) { return true; };
   // Always enable LRU purging to handle socket exhaustion gracefully.