Cloudflare launches Kitesurf, a browser engineered for AI agents
The infrastructure provider says the browser uses less CPU and memory than Chromium, offering a leaner alternative for developers building autonomous software.
Cloudflare has introduced Kitesurf, a cloud-hosted browser designed specifically for artificial intelligence agents rather than human users. Built on the company’s Workers serverless platform, the tool aims to reduce computing power and costs compared to traditional Chromium-based browsers for tasks such as web navigation, form filling, and HTML extraction. It is currently available for free in beta via Browser Run.
The launch marks a shift in how web browsers are utilised as AI software evolves from simple chatbots to agents capable of completing tasks on users’ behalf. Unlike traditional browsers optimised for visual elements like themes, tabs, and extensions, Kitesurf prioritises functional efficiency and resource management. The architecture addresses specific AI agent requirements, including context windows, performance, token costs, and scalability, while aiming to mitigate threat models such as prompt injection attacks.
Cloudflare stated the decision to build Kitesurf was made just 12 weeks prior to the announcement. The browser’s architecture is entirely hosted on Cloudflare Workers, distinguishing it from traditional local browser installations. The company credited the open-source Rust headless engine, Obscura, as inspiration, noting the initial proof of concept was a port of Obscura to Workers.
The browser utilises technologies including a modular rendering engine from Blitz, Firefox’s CSS parser (Stylo), and Boa JS, a Rust ECMAScript engine. Cloudflare claims Kitesurf uses less computing power (CPU and memory) than Chromium for common agentic tasks. The company says it passes over 215,000 web platform tests and correctly renders pages such as TodoMVC, Wikipedia, and Hacker News.
Browser Run is Cloudflare’s service that allows developers to programmatically control and interact with headless browser instances on its network. By providing this infrastructure, Cloudflare enables AI developers to build software that can navigate websites and complete other browser-based tasks without having to build their own browser software from scratch.
