What is Cloudflare Browser Rendering?
Cloudflare Browser Rendering is a serverless browser automation service that runs on Cloudflare Workers. It enables AI agents and applications to control a headless browser directly from the edge, allowing them to navigate websites, interact with dynamic content, and extract data at scale without managing browser infrastructure. Agent Analytics can track when it visits your website.
Category
Expected Behavior
Cloudflare Browser Rendering is generic automation, so its pattern is whatever script or AI is driving it. Human guided runs look like short deliberate sessions, while autonomous runs look like a browser that never gets tired. Judge it by request timing and paths, which reveal more than its name does.
Overview
| Operated By | Cloudflare |
| Expected To Follow Robots.txt | No |
| Insights Last Updated | July 7, 2026 |
Robots.txt Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
As of July 7, 2026, 0% of top websites block Cloudflare Browser Rendering in their robots.txt files.
Overall Automated Agent Traffic
As of July 7, 2026, 0.1% of all web traffic came from automated agents.
Top Visited Website Categories
This data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the world's top 1000 websites and their robots.txt files.
Cloudflare Browser Rendering's User Agent
| User Agent | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36 |
Access other known user agents and IP addresses using the Enterprise API.
How To Block Cloudflare Browser Rendering
Add this rule to your robots.txt file to request that Cloudflare Browser Rendering not access your website. You can customize which pages are blocked by swapping out / for a different path.
User-agent: Cloudflare Browser Rendering # https://knownagents.com/agents/cloudflare-browser-rendering
Disallow: /Frequently Asked Questions
Should I Block Cloudflare Browser Rendering?
Judge it by its behavior. Agents in this category range from harmless testing tools to abusive automation, and Cloudflare Browser Rendering's purpose depends on whoever is running it. Block it if it hits login pages, submits forms, or crawls faster than any human could. Almost none of the top websites we track have robots.txt rules for Cloudflare Browser Rendering right now.
Does Cloudflare Browser Rendering Respect Robots.txt?
No. Cloudflare Browser Rendering is not expected to honor robots.txt, so a disallow rule only states your preference. Enforce the block with firewall or server rules, then confirm in Agent Analytics that its requests actually stop.
Does Cloudflare Browser Rendering Access Private Content?
It accesses whatever it is scripted to access. If someone gives Cloudflare Browser Rendering credentials, it can do anything that account can do. Without them, it is limited to public pages.
Why Is Cloudflare Browser Rendering Visiting My Website?
Someone automated a task that involves your site. Cloudflare Browser Rendering could be running tests, collecting data, or following an AI system's instructions, and its visit pattern tells you more than its user agent string does.
How Can I Tell if Cloudflare Browser Rendering Is Visiting My Website?
Agent Analytics tracks Cloudflare Browser Rendering visits and every other known AI agent, crawler, and scraper alongside it, then authenticates each visit against Cloudflare Browser Rendering's published verification method. You can also check your server logs for requests whose user agent string contains "Cloudflare Browser Rendering". Look for regular timing and repeated paths that no human browsing would produce. A log match is still not proof, because any bot can claim to be Cloudflare Browser Rendering.