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Not sure what DDoS is or how it's used? Read more in our Learning Center. What is DDoS?

Free DDoS Web Protection

Powerful DDoS (L7) protection for websites & web applications, free with ALL application service plans.
  • Cloudflare’s 155 Tbps network blocks an average of 124 billion daily threats.
  • Intelligent and automated mitigations at the edge.

The Cloudflare Difference

Free

All Cloudflare plans offer unlimited and unmetered mitigation of DDoS attacks. Customers are not charged for attack traffic ever, period. There’s no penalty for spikes due to attack traffic, requiring no chargeback by the customer.

Easy

Easily onboard your web applications within minutes from the dashboard or the API. Adding other Cloudflare security, performance, and reliability functionality is as easy as flipping a switch.

Robust

With over 155 Tbps of network capacity and a global network that’s constantly learning from the millions of Internet properties on it, Cloudflare protects you against the largest and most sophisticated attacks.

Industry Leading

Cloudflare named a "Leader"

Forrester Wave™ DDoS Mitigation Solutions Q1 2021

According to Forrester, "Cloudflare protects against DDoS from the edge, and fast," and that "customer references view Cloudflare’s edge network as a compelling way to protect and deliver applications."

AUTOMATED, UNMETERED, ALWAYS-ON DDOS PROTECTION

Fast mitigation

Cloudflare centralized and decentralized mitigation systems work in concert to identify and mitigate most DDoS attacks in under 10 seconds (3 seconds on average). Preconfigured static rules are deployed in less than 1 second.

How it Works

With a simple change to your DNS settings, you can onboard your website to Cloudflare within minutes. Cloudflare’s globally distributed anycast network routes visitor requests to the nearest Cloudflare data center.

  • When Cloudflare’s edge data centers receive a request, they scan it to see if the visitor appears to be a threat, using criteria such as HTTP headers, user agent, query string, path, host, HTTP method, HTTP version, TLS cipher version, and request rate. We also look at HTTP response metrics such as error codes returned by customers’ origin servers.

  • Our global and local DoS mitigation systems work in concert to protect new and existing threats of any size or kind against your website.

  • Any resources that are already cached are served from Cloudflare’s data centers directly. Other client request traffic is sent to your origin server over Cloudflare’s high-performance network.

Security with fast performance

Cloudflare’s DDoS protection is designed to integrate and operate seamlessly with other security and performance products including Web Application Firewall, Bot Management, Load Balancer, CDN, and more.

See what we see

Cloudflare’s built-in analytics give you deeper insights into your traffic patterns, threats observed (and blocked), and much more right from the dashboard or via the Cloudflare GraphQL API. Cloudflare logs can also be integrated with third-party SIEMs.