Construct and execute computational graphs that are at the heart of neural networks, taking advantage of on-device hardware acceleration. Currently, JavaScript frameworks must repurpose Web APIs like WebGL, WebGPU and Wasm for the individual compute operations when executing computational graphs. The WebNN API allows JavaScript frameworks to access the native operating system machine learning APIs and the hardware accelerators underneath for the best performance and reliability of results.


Deep Learning, a subfield of Machine Learning (ML), with its various neural network architectures enables new user experiences for web applications that range from improved video conferencing to accessibility-improving features, with potential for improved privacy over cloud-based solutions. Key neural network-based use cases that apply to a wide range of web applications include e.g., face detection, semantic segmentation, style transfer, super resolution, image captioning, machine translation, and noise suppression. While some of these use cases can be implemented in a constrained manner with existing Web APIs (e.g. WebGL, WebGPU and WebAssembly), the lack of access to platform capabilities beneficial for ML such as dedicated ML hardware accelerators constraints the scope of experiences and leads to inefficient implementations on modern hardware. This disadvantages the web platform in comparison to native platforms.




Specification link

Specification currently under development in a Working Group

Status in Chromium


No active development (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

  • No signal
  • No signal
  • Positive


Intent to Prototype url

Intent to Prototype thread


The WebNN API spec incorporates ethical considerations. The group is working on a complementary document [1] that outlines ethical issues associated with using Machine Learning on the Web and discusses how implementers and web developers can mitigate associated risks. [1]:

Last updated on 2021-12-21