The Native Client (NaCl) web plug-in was an open-source technology developed by Google to execute native compiled code—specifically written in C and C++—directly inside the web browser.
was an open-source technology developed by Google in the late 2000s. It allowed software developers to execute compiled native code—specifically C and C++—inside the Google Chrome browser. nacl-web-plug-in
Because NaCl modules were sandboxed away from the operating system and the browser's Document Object Model (DOM), they could not communicate directly with the web page. To bridge this gap, Google introduced the . The Native Client (NaCl) web plug-in was an
The "nacl-web-plug-in" refers specifically to this browser plugin component that enabled web pages to load and execute NaCl modules, much like Flash or other NPAPI plugins, but with a much stronger focus on security. Because NaCl modules were sandboxed away from the
By far the most common reason users seek out the NACL Web Plug‑in is to view live video feeds from older IP cameras and video surveillance systems. Many camera manufacturers embedded a NaCl‑based viewer directly into the camera’s web interface. When you navigate to the camera’s login page, the page attempts to load a NaCl module that decodes and displays the video stream. If the NaCl runtime is unavailable, the camera shows a message that it needs to install the “NACL Web Plug‑in”.