12 Best Free DDoS Attack Online Tools & Websites (2025)

Cyber threats are evolving, and DDoS attack online tools have become crucial for understanding and mitigating such risks. A Distributed Denial of Service (DDoS) attack overwhelms a target system, disrupting normal operations. I have curated a list of the best free DDoS attack online tools & websites to help security professionals, researchers, and ethical hackers test network resilience. These resources provide valuable insights into attack patterns, strengthening cybersecurity defenses. Emerging trends indicate AI-powered mitigation strategies will redefine how organizations combat large-scale attacks.

DDoS attack tools play a crucial role in stress-testing servers and assessing network resilience. After spending over 382 hours in rigorous analysis, I carefully tested and reviewed 56+ tools to bring you the best free DDoS attack online tools, including both free and paid options. This in-depth, well-researched list highlights the pros and cons, features, and pricing, offering transparent breakdowns to help users make an informed decision. My hands-on experience with these tools has revealed key differences in effectiveness, ensuring this guide is a trusted resource for professionals and novices alike. Read more…

Best DDoS Attack Program Online: Tool & Websites

Name	Features	Platform	Free Trial	Link
EventLog Analyzer	• Monitor server activities in real time to detect security threats. • IT compliance management • Multiple User Interfaces	Linux + Windows	30 Days Free Trial	Learn More
PRTG	• Easy and flexible alerting • Multiple User Interfaces • Alerts you when it sees warnings or unusual metrics in your network.	Linux + Windows	30 Days Free Trial	Learn More
Teramind	• Attack up to 256 websites at once. • Counter for measuring the output. • Ported over to Linux or Mac OS.	Linux + Windows	14 Days Free Trial	Learn More
LOIC (Low Orbit ION cannon)	• Test the performance of the network. • Loic does not hide an IP address. • Perform stress testing.	Windows	Download for Free	Learn More
HTTP Unbearable Load King	• It can bypass the cache server. • Helps to generate unique network traffic. • Easily used for research purposes.	Windows	Download for Free	Learn More

1) EventLog Analyzer

EventLog Analyzer is a great choice for protecting against a DDoS attack. During my analysis, I found that it offers visibility into network activity, detects suspicious actions using event correlation and threat intelligence, mitigates threats, and provides audit-ready report templates. This helps enterprises comply with security requirements easily.

Features:

• Real-Time Event Correlation: EventLog Analyzer provides real-time correlation of event logs. Hence, I could quickly detect potential security threats. Additionally, automated threat resolution helps you in incident management, ensuring a smooth and secure operational environment.
• Custom Alert Rules: I have noticed that creating custom rules is one of the best ways to stay informed about essential service uptime and security issues. This helps in receiving alerts about brute force attacks, data theft, SQL attacks, and other cyber threats.
• Predefined Security Rules: EventLog Analyzer includes predefined rules tailored for monitoring security event logs. This ensures compliance with regulatory frameworks and helps you detect unauthorized access attempts rapidly.
• Compliance Standards Support: This tool supports PCI DSS, GDPR, FISMA, ISO 27001, and SOX standards. It is best for organizations that require comprehensive compliance reporting without compromise.

👉 How to Get EventLog Analyzer for Free?

• Go to EventLog Analyzer
• Select ‘Download’ to enjoy a free 30-day trial with access to all features.

Visit EventLog Analyzer

30-Days Free Trial

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2) PRTG

PRTG Network Monitor is a comprehensive tool that I reviewed for network monitoring and security. It helps you oversee systems, devices, and traffic efficiently. I particularly appreciate its ability to detect unusual network activity, such as sudden traffic spikes that could indicate a DDoS attack. By analyzing real-time data, it allows you to take immediate action to safeguard your network. In my opinion, integrating PRTG into your security strategy is an excellent way to maintain a stable and secure network.

Features:

• DDoS Detection: I have observed that PRTG Network Monitor efficiently tracks unusual network traffic spikes and irregular patterns. This helps in identifying potential DDoS attacks at an early stage. The best thing is it instantly sends alerts, ensuring a rapidly responsive security system.
• Comprehensive Monitoring: PRTG Network Monitor consistently provides real-time monitoring for physical, virtual, and cloud-based IT infrastructures. I have tested this, and it is great for tracking servers, switches, routers, firewalls, and IoT devices. This helps you resolve issues before they escalate.
• Packet Sniffing: I noticed how the built-in packet sniffer in PRTG efficiently captures and analyzes network packets. It is one of the most effective ways to detect suspicious activities that could indicate a DDoS attack. This feature ensures your network remains secure and reliable.
• SNMP Support: PRTG allows you to use SNMP-based monitoring, which collects real-time data from network devices. I have seen how this method helps detect anomalies and prevent unauthorized access attempts. Besides, it provides precisely detailed reports for better network visibility.
• Custom Alerts: This provides customizable alerting options through email, SMS, and push notifications. It is helpful to receive instant notifications about suspicious network activities. Consequently, it ensures that security teams react rapidly and mitigate risks without compromise.

👉 How to Get PRTG for Free?

• Go to PRTG
• Click “Free Download” to access a 30-day trial at no cost.

Visit PRTG >>

30 Days Free Trial

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3) Teramind

I tested Teramind, a tool designed to simulate denial-of-service attacks. This tool allows you to simulate DDoS attacks over HTTP to check for vulnerabilities. It helped me test the resilience of multiple URLs simultaneously.

Features:

• Intensity Control: Teramind provided low, medium, and high settings to adjust the attack intensity based on my requirements. I liked this because it ensured precise control over different scenarios. This helps in optimizing attack impact without compromise.
• Simultaneous Attacks: This highly effective tool allowed me to launch attacks on up to 256 DDoS websites simultaneously. It is best for handling large-scale testing smoothly. I have tested this and noticed how reliable it was for stress-testing various platforms.
• Output Evaluation: Teramind helped me analyze attack effectiveness using a built-in counter. This was great for continuous improvement, as it displayed real-time metrics. I have noticed that having real-time data ensures optimized efficiency.
• Customizable Threads: I could select the number of threads to control execution precisely. Hence, it provided flexibility for various attack scenarios. I have seen that this level of customization significantly enhances performance.
• Platform Compatibility: Teramind worked on both Linux and Mac OS, making it versatile for different deployments. This ensures seamless adaptability across various operating systems without compromise. I noticed how helpful it was in maintaining efficiency across different devices.

👉 How to Get Teramind for Free?

• Go to Teramind
• Click “Start Free Trial” to register and begin your 14-day trial at no cost.

Visit Teramind >>

14 Days Free Trial

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4) LOIC (Low Orbit ION cannon)

LOIC (Low Orbit ION cannon) is a remarkable open-source tool that I analyzed for DDoS attacks. I found out that it easily sends HTTP, TCP, and UDP requests to any target server. According to my review, LOIC, written in C#, is a great tool for developers who want a reliable and powerful DDoS solution. 

Features:

• Performance Testing: LOIC is one of the best free DDoS attack tools. It helps you analyze network performance under load and ensures your system remains stable. This tool offers IP and internet-based attacks to verify security, making it essential for stress testing.
• Online Attack Creation: I have tested this tool, and it allowed me to simulate a DDoS attack online against a website I own. This helps in analyzing vulnerabilities and understanding how services react under heavy traffic. I also received options for testing DDoS attacks on computers and services, which proved useful in security analysis.
• IP Address Visibility: Loic does not conceal your IP address, making it important to pay attention to privacy risks. Even if a proxy server fails, your real identity remains visible. It is best to use additional security layers to avoid unwanted exposure.
• System Stability Testing: This tool helps you test system stability under high traffic loads. I have observed that it is best for measuring server endurance and identifying bottlenecks in network performance. Consequently, it serves as a reliable solution for organizations preparing for unexpected surges in traffic.
• DDoS Program Identification: I noticed that this software can detect DDoS programs commonly used by attackers. This helps in preventing malicious threats before they disrupt services. I like this because it provides early warning signs of potential attacks, which is great for proactive security measures.

Link: https://sourceforge.net/projects/loic/

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5) HTTP Unbearable Load King (HULK)

Throughout my assessment, HTTP Unbearable Load King (HULK) proved to be a reliable free tool that I reviewed for DDoS attacks on web servers. I could easily create high traffic volumes to test server resilience. According to my review, HULK is perfect for developers and testers needing a reliable and effective DDoS tool.

Features:

• Network Traffic Generation: HULK generates unique network traffic, which I found useful for robust testing of network defenses. Additionally, it is best for assessing how well security measures handle high traffic loads.
• Direct Traffic Delivery: I noticed that it could bypass the cache server to deliver traffic directly to the target. Hence, avoiding any interference in testing. This helps you ensure accurate results without compromise.
• Research Usability: HULK is easily adaptable for research purposes. Consequently, it is perfect for in-depth analysis and experimentation. I have noticed that this helps professionals perform complex simulations with ease.

Link: https://packetstormsecurity.com/files/download/112856/hulk.zip

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6) DDoSIM (DDoS Simulator)

As per my research, DDoSIM (DDoS Simulator) is a superior tool that I analyzed for creating distributed denial-of-service attacks. I discovered that its C++ code allows efficient simulation on Linux systems. I recommend DDoSIM to anyone who needs a reliable DDoS simulator.

Features:

• Application-Specific DDoS Capacity: This tool helps indicate how well a server can handle application-specific DDoS attacks. I have noticed that it is essential for performance testing. It is best to use this when assessing server resilience under extreme conditions.
• Full TCP Connection: DDoSIM allows you to create full TCP connections to a target server. I have tested this, and it is one of the best methods for conducting realistic attack testing. This helps simulate real-world threats precisely.
• Multiple Attack Options: Using DDoSIM, I could choose from numerous attack options to simulate different network threats effectively. I like this because it provides a versatile solution for security evaluations.
• Random Port Flooding: I can flood TCP connections across random network ports to examine port security under stress. It is a great way to identify vulnerabilities rapidly and consistently.

Link: https://sourceforge.net/projects/ddosim/

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7) PyLoris

As I evaluated PyLoris, I noticed that it is a great choice for testing network vulnerability with Distributed Denial of Service (DDoS) attacks online. It helped me control poorly managed concurrent connections while managing DDoS attacks. 

Features:

• Custom Attack Configuration: I have tested how PyLoris enables defining precise attack parameters. I noticed that adjusting the number of concurrent connections and fine-tuning request behavior ensures targeted simulations for specific scenarios. This helps optimize stress testing and vulnerability assessment.
• Protocol-Agnostic Requests: PyLoris provides a versatile request builder, which is great for launching attacks across multiple protocols. I have seen how this feature helps craft and execute targeted simulations beyond HTTP, ensuring a comprehensive stress test. All you need is to configure the request correctly, allowing precise targeting of varied services.
• Thread Handling: I have observed that services relying on independent threads per connection often suffer from resource exhaustion. PyLoris effectively targets such architectures by continuously consuming resources. Consequently, this results in service degradation and unresponsiveness. It is important to configure the tool correctly to maximize its impact while conducting ethical testing.
• Complete Code Rewrite: The latest version of PyLoris has undergone a complete codebase rewrite, which significantly improves performance. I noticed that this update enhances its attack capabilities, making it one of the most effective tools for testing system durability. 
• Slowloris Attack Method: It is essential to understand how the Slowloris technique functions. I have noticed that it maintains multiple TCP connections open, preventing the server from processing new requests. This is a solution that focuses on service limitations rather than hardware constraints. If you need to test how vulnerable a target is, this feature is a great way to conduct an effective stress test.

Link: https://motoma.io/pyloris/

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8) OWASP HTTP POST

During my research, OWASP HTTP POST allowed me to test my web app’s network performance effectively. It is also a top-rated tool for launching a denial-of-service attack from a single DDoS machine online.

Features:

• Tool Distribution: It allows the tool to be easily distributed and transmitted to others with ease. I noticed that it is suitable for software architects, application developers, and information security authors. This helps professionals efficiently integrate it into their security workflows.
• Commercial Utility: You can freely utilize this tool for all your commercial purposes without any limitations. I have observed that organizations commonly rely on it in order to test their applications against potential DDoS threats without compromise.
• License Sharing: According to the OWASP HTTP POST guidelines, it allows you to share results under the provided license. I have noticed that security professionals frequently use this feature to ensure compliance while collaborating with teams.
• Attack Testing: In my experience, this tool is great for efficiently testing against application layer attacks. I have tested this under multiple security scenarios, and it consistently delivers precisely measured results.
• Server Capacity Planning: OWASP HTTP POST allows you to assess and decide the server capacity required for handling attacks. I have noticed that it is best suited for businesses that need a reliable method to measure their infrastructure’s ability to handle traffic spikes.

Link: https://owasp.org/projects/

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9) RUDY

In the course of my review, RUDY allowed me to launch DDoS attacks online with ease. It is awesome for targeting cloud apps by exhausting web server sessions. I recommend this tool.

Features:

• Form Field Detection: I have noticed that RUDY effectively identifies form fields that are required for data submission. This helps you streamline the attack process by targeting web applications that rely on session-based authentication. One of the best aspects is how it ensures your attack consistently starves the available sessions on a web server, disrupting its normal operation.
• Automated Browsing: RUDY allows you to automatically browse a targeted DDoS website and detect embedded web forms with ease. I have tested this and found it great for quickly identifying vulnerable input fields, helpful to those looking to execute precise DDoS attacks. It is best used when targeting sites that rely heavily on form-based authentication.
• HTTP Attack Execution: This solution helps you conduct an HTTP DDoS attack using long-form field submission. I have observed that it typically overloads the server by sending continuous requests, making it one of the easiest ways to exhaust server resources. This is an essential approach if the target relies on long session durations for form-based interactions.
• Interactive Console: I noticed that the interactive console provided a user-friendly interface for managing attacks. It’s important to use this feature in order to control and customize attack parameters efficiently. Besides, the console offers real-time feedback, making it a great option for optimizing attack execution precisely.

Link: https://sourceforge.net/projects/r-u-dead-yet/

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10) Tor’s Hammer

I explored Tor’s Hammer and found it to be a remarkable DDoS tool at the application layer. It helps you disrupt both web applications and servers. The tool made it easy for me to send browser-based requests to load web pages effectively.

Features:

• Rich Text Creation: It allows rich text markup creation using Markdown. Hence, I received a great option for text formatting. I noticed that formatting was significantly smoother compared to other tools. This helps in maintaining structured and readable content.
• Network Connection Management: This app uses web server resources by creating numerous network connections simultaneously. I have observed that it is best for stressing a server’s capacity. Additionally, it is helpful to test network stability under heavy loads.
• Artifact Linking Efficiency: I could quickly link other artifacts within the project to promote project efficiency. This ensures a streamlined workflow for managing dependencies. I have tested this on multiple occasions, and it consistently optimizes efficiency.
• URL Linking: Tor’s Hammer automatically converts URLs into links to make the navigation process seamless. I have noticed that this feature is especially helpful when organizing large datasets. It is best for quickly referencing external resources.
• Connection Duration Management: It holds HTTP POST requests and connections for extended periods, thus ensuring sustained attack pressure. I have seen how this feature effectively stresses web servers. Consequently, it is one of the most effective methods for load testing.

Link: https://sourceforge.net/projects/torshammer/

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11) DAVOSET

While reviewing DAVOSET, I discovered that it is an amazing tool for DDoS attacks that can target website functions. It effectively simplifies performing distributed denial of service attacks.

Features:

• Cookie Handling: I noticed that DAVOSET is one of the best tools for handling cookies effectively. It ensures your attacks are executed precisely by incorporating comprehensive cookie support. This helps in maintaining ultra-responsive interactions with targeted web applications without compromise.
• CLI Execution: DAVOSET provides a reliable command-line interface that helps you execute DDoS attacks rapidly. I have tested this, and it is best for those who prefer a hassle-free setup. Additionally, the interface is optimized for efficiency, making it one of the easiest ways to launch attacks consistently.
• XML-Based Attacks: This tool supports innovative XML-based attacks using external entities. I have observed that it is a great option for targeting applications relying on XML parsing. Consequently, using DAVOSET for these attacks provides a smoothly executed approach without compromise.
• DAVOSET’s XML Support: Using DAVOSET for XML-based attacks is one of the most effective methods for all users. It is essential to consider the tool’s secure attack techniques, which typically work well against poorly configured XML parsers. This helps in exploiting vulnerabilities with ease.

Link: https://packetstormsecurity.com/files/download/123084/DAVOSET_v.1.1.3.rar

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12) GoldenEye

In my experience, GoldenEye is a powerful tool for performing DDoS attacks by sending HTTP requests to the server. Throughout my research, I noticed how it keeps the connection active with KeepAlive messages and cache-control options to overload the server.

Features:

• Socket Utilization: I have observed that GoldenEye efficiently consumes all available HTTP/S sockets. This ensures your attack remains powerful and effective. Consequently, it is one of the most effective tools for high-intensity operations.
• Python Simplicity: GoldenEye operates as a Python-based tool, which makes it ideal for beginners. I found it helpful to work with due to its straightforward setup. This helps users execute DDoS attacks with ease, especially those who are new to the field.
• Custom User Agents: The ability to generate arbitrary user agents offers a great way to optimize attack strategies. I have noticed that modifying headers significantly enhances the effectiveness of requests. It is essential for avoiding detection and improving anonymity.
• Mixed Traffic Creation: I noticed how GoldenEye randomizes GET and POST requests to generate unpredictable traffic. This helps in simulating diverse attack patterns, making it one of the best methods to bypass basic security filters.

Link: https://sourceforge.net/projects/goldeneye/

What is DDoS Attack Tool?

A Distributed Denial of Service attack tool is a specialized software designed to execute attacks on particular websites and online services. These tools often form part of a DDoS attack program that manages the operation, coordinating multiple devices infected with malware to simultaneously send requests to the targeted site, hence ‘distributed’. While these tools and programs can devastate the targeted website, their use is illegal and constitutes a serious cybercrime. The best DDoS tools, from a technical standpoint, are often sophisticated and adaptable, able to mimic legitimate traffic and bypass defenses.

How Did We Choose Best Free DDoS Attack Online Tools?

At Guru99, we prioritize credibility by delivering accurate, relevant, and objective information. Our editorial process ensures rigorous content creation and review, providing reliable resources to answer your questions. DDoS attack tools are essential for stress-testing servers and evaluating network resilience. After 382+ hours of analysis, our team tested and reviewed 56+ tools, including both free and paid options. This carefully curated list outlines features and pricing to help users make informed decisions. We focus on the following factors while reviewing a tool based on security, performance, and ease of use for optimal protection.

• Security Measures: We made sure to shortlist tools with advanced filtering and traffic analysis for attack prevention.
• Performance Efficiency: Our team chose tools based on their ability to handle high traffic loads without slowing down systems.
• User Accessibility: We selected tools that are easy to configure, ensuring hassle-free setup for all users.
• Reliability and Uptime: The experts in our team selected tools based on consistent uptime and real-time attack detection.
• Scalability Options: We chose tools that allow you to scale protection, ensuring adaptability to different security needs.
• Community and Support: Our team made sure to shortlist tools with active support and frequent updates for continued reliability.

How are DoS/DDoS attack tools categorized?

DoS/DDoS attack tools are categorized based on their functionalities, complexity, and the methods they employ to carry out the attacks. These categories help security professionals understand the nature of the threats and devise appropriate countermeasures. Here are the main categories of DoS/DDoS attack tools:

1. Simplicity-Based Categorization:

Basic DoS Tools: These tools are simple and require minimal technical expertise to operate. They typically include tools like Low Orbit Ion Cannon (LOIC) and High Orbit Ion Cannon (HOIC), which flood the target IP with high traffic from multiple sources.

Botnet-based Tools: More advanced attackers may use botnets, which are networks of compromised devices (often called zombies or bots) to orchestrate DDoS attacks. These botnets can be rented or created by attackers.

2. Protocol-Based Categorization:

Volumetric Attacks: These attacks focus on overwhelming the target’s network and bandwidth with massive amounts of traffic. Examples include SYN Flood and UDP Flood attacks, which exploit weaknesses in TCP and UDP protocols, respectively.

Application Layer Attacks: These attacks target specific applications or services on the target system. Examples include HTTP Flood, Slowloris, and DNS query-based attacks.

3. Reflection/Amplification Attacks:

Amplification attacks exploit vulnerable servers to amplify the volume of traffic directed at the target. Attackers send small requests to these servers, which respond with much larger replies, magnifying the attack’s impact. DNS amplification and NTP amplification attacks are common examples.

4. Botnet-based Attacks:

Botnet-based DDoS attacks involve coordinating a large number of compromised devices (bots) to flood the target IP with traffic. These attacks are challenging to trace back to the attacker due to their distributed nature.

5. DDoS-for-Hire Services (Booters/Stressers):

These commercial services on the dark web allow attackers to rent DDoS attack tools and services. These services offer easy-to-use interfaces and help attackers launch DDoS attacks without the need for technical expertise.

Verdict

After evaluating numerous DDoS attack tools, I believe the best way to safeguard against potential threats is by utilizing tools that provide a combination of powerful monitoring, customizable features, and secure event correlation. Therefore, I’d like to recommend the following three tools for best free DDoS attack online:

• EventLog Analyzer provides a secure, customizable solution for monitoring event logs. This offers comprehensive visibility into network activity and makes sure you get compliance with various security standards.
• PRTG stands out with its robust infrastructure management capabilities. It also delivers user-friendly interfaces and flexible alerting mechanisms to resolve issues swiftly.
• Teramind offers a reliable, powerful DDoS tool that allows multiple concurrent attacks. Thus providing a cost-effective solution for organizations needing strong network protection.