AI Writing Goes Native in the Browser
Google has completed the global rollout of Chrome's on-device AI writing assistant to all desktop users running Chrome 128 or later on compatible hardware. The feature, accessible via right-click in any text input field, offers three capabilities: rewrite (restructuring for clarity), elaborate (expanding a short draft), and formalize (adjusting tone for professional contexts).
On-Device Processing
The feature uses Gemini Nano, Google's smallest language model designed specifically for on-device deployment, running entirely within the Chrome browser using the device's CPU and Neural Processing Unit (on supported hardware). No text is sent to Google's servers. Google provides a technical attestation that the feature is architecturally incapable of server transmission in standard operation.
Hardware Requirements
Full AI writing assistance requires Chrome on a device with at least 8GB RAM and 22GB free disk space for the Nano model. Devices with NPUs (Apple M-series, Qualcomm Snapdragon X, Intel Core Ultra, AMD Ryzen AI) run inference 3-5× faster than CPU-only devices. Older hardware still receives the feature but with slower response times.
Competitive Context
Microsoft Edge has offered similar AI writing features through Copilot integration since 2023, though Edge's implementation uses server-side processing by default. Apple's Safari on Apple Silicon runs Writing Tools on-device via Apple Intelligence. Chrome's rollout at 3 billion+ users represents the largest single deployment of on-device AI assistance.
Developer API
Google simultaneously released the Prompt API and Write/Rewrite API for web developers, enabling websites to invoke on-device Gemini Nano for their own AI features without hosting model infrastructure.