Cloudflare Unveils Kitesurf Browser Built for AI Agent Tasks

Cloudflare has launched Kitesurf, a cloud-hosted browser built to help AI agents use websites and complete online tasks.

The beta runs on Cloudflare Workers and is free through Browser Run, subject to account limits. Developers can use Kitesurf for screenshots, HTML extraction, form completion and other automated browser work, with support for existing tools through the Chrome DevTools Protocol, including Playwright, Puppeteer and compatible AI clients.

Unlike a consumer browser, Kitesurf has no desktop interface for daily web use — developers call it through APIs and automation libraries inside Workers. This lets software open pages, read content, capture files and complete forms without maintaining a separate browser service or dedicated server infrastructure for each agent task.

Cloudflare's benchmarks show Kitesurf uses far fewer resources than Chromium: it consumed 380 milliseconds of CPU time for screenshots versus Chromium's 1,173 milliseconds, and 57.8 MiB of memory versus 271 MiB. However, lower resource use came with slower completion times — Kitesurf took 1.8 times longer for screenshots and 1.7 times longer for HTML extraction.

Cloudflare built Kitesurf around the idea that every page load may contain unsafe code. Each browser session starts fresh, and separate components receive access only to the resources required for their tasks, limiting data leaks between pages. A dedicated SandboxOutbound worker handles requests for images, scripts, fonts and stylesheets, checking cross-origin rules and filtering responses.

Kitesurf divides browser work among an Engine, PageScript and PageRenderer. Cloudflare used Blitz modules, Firefox's Stylo CSS parser and the Boa JavaScript engine, and traces its first working model to Obscura, an open-source Rust engine designed for browser automation.

Kitesurf currently renders TodoMVC applications, Wikipedia, Hacker News and Cloudflare's blog, passing more than 235,000 Web Platform Test subtests. But it does not yet support video playback, WebGL, long authenticated sessions or some bot-check systems; developers needing those functions can continue using Browser Run's Chromium option.

Cloudflare built the browser in 12 weeks and released it while development continues. The company plans broader protocol coverage, better screenshots, more standards support and lower resource use, and intends to release Kitesurf as open-source software once the project is ready.