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By the makers of zunoy

Free Public MQTT Broker.

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FreeMQTT Public Broker Info

Broker URL

:broker.freemqtt.com

Port (TCP)

:1883

Port (SSL/TLS)

:8883

WebSocket URL (WS)

:ws://broker.freemqtt.com:8083/mqtt

WebSocket URL (WSS)

:wss://broker.freemqtt.com:8084/mqtt

Username

:freemqtt

Password

:public
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Legal Policies

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Online Dispute Resolution

The European Commission provides a platform for online dispute resolution. Please reach us via our contact email for further assistance.

Application for Other Web Presence and Media

All policies apply equally to our web presence on third-party platforms (e.g., GitHub, X, LinkedIn) as well as to our newsletter.

Liability for Content

We strive to keep our content accurate and up to date. However, as a service provider we are not obliged to monitor third-party information or investigate illegal activities. If we become aware of infringements, we will remove such content immediately.

Liability for External Links

Our website may contain links to external sites. We have no influence over the content of those sites and therefore cannot accept liability for them. Upon notice of legal violations, such links will be removed promptly.

Copyright

The content and works published on this website are governed by applicable copyright laws. Any duplication, processing, distribution, or any form of commercialization of such material beyond the scope of the copyright law shall require the prior written consent of its respective author or creator.

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Get Started with FreeMQTT

Connect instantly to our free public broker. Use the credentials below and try publishing/subscribing with your favorite MQTT client or SDK

nodejs

1const mqtt = require('mqtt');
2const client = mqtt.connect('mqtt://broker.hivemq.com');
3
4client.on('connect', () => {
5  client.subscribe('test/topic', (err) => {
6    if (!err) client.publish('test/topic', 'Hello MQTT');
7  });
8});
9
10client.on('message', (topic, message) => {
11  console.log(message.toString());
12});
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Use Cases of Public MQTT Broker

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IoT Device Prototyping

Quickly connect IoT devices, sensors, or apps without setting up a private broker. FreeMQTT is ideal for experimenting with new hardware.

IoT Device Prototyping

Quickly connect IoT devices, sensors, or apps without setting up a private broker. FreeMQTT is ideal for experimenting with new hardware.

IoT Device Prototyping

Quickly connect IoT devices, sensors, or apps without setting up a private broker. FreeMQTT is ideal for experimenting with new hardware.

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Key Features of Public FreeMQTT Broker

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Public & Free Access

Connect instantly using provided credentials. No signup or complicated setup — start publishing and subscribing right away.

Public & Free Access

Connect instantly using provided credentials. No signup or complicated setup — start publishing and subscribing right away.

Public & Free Access

Connect instantly using provided credentials. No signup or complicated setup — start publishing and subscribing right away.

Public & Free Access

Connect instantly using provided credentials. No signup or complicated setup — start publishing and subscribing right away.

Public & Free Access

Connect instantly using provided credentials. No signup or complicated setup — start publishing and subscribing right away.

Public & Free Access

Connect instantly using provided credentials. No signup or complicated setup — start publishing and subscribing right away.

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Features Comparision with Competitors

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Breakdown of features
FreeMQTT
RabbitMQ
Protocol Type Communication style
Lightweight publish/subscribe protocol
Enterprise-grade message broker with queues & exchanges
Primary Focus
IoT messaging, telemetry, real-time device updates
General-purpose enterprise messaging, workflows, backend apps
Performance
Ultra-low bandwidth, high-latency tolerant
Reliable, high-throughput messaging for complex systems
Scalability
Designed to handle millions of concurrent device connections
Scales for enterprise workloads but with heavier infra requirements
Reliability
Focuses on speed & efficiency (QoS options for delivery assurance)
Strong durability, persistence, acknowledgements, guaranteed delivery
Ease of Use
Simple setup, runs even on small servers & edge devices
Requires more resources, tuning, and admin knowledge
Best For
IoT testing, mobile apps, education, rapid prototyping
Enterprise apps, financial systems, mission-critical operations
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Powerful MQTT Client - Coming Soon...!

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Quick Connections

Quick Connections

Quick Connections

Quick Connections

Quick Connections

Quick Connections

Quick Connections

Quick Connections

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Frequently asked question and answers

MQTT is a lightweight, publish-subscribe network protocol that transports messages between devices.
MQTT is designed for lightweight communication with low bandwidth and minimal battery use, while HTTP is more heavy-duty and request-response based.
The broker is the central server that receives all messages, filters them, and distributes them to subscribed clients.
MQTT defines three Quality of Service levels: 0 (at most once), 1 (at least once), and 2 (exactly once) to ensure message delivery reliability.
Yes, MQTT is designed to work efficiently over unreliable networks, making it ideal for IoT applications.
Topics are the routing labels for messages, while payloads contain the actual data being sent.
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