Public MQTT brokers you can connect to right now — with hosts and ports — plus free open-source brokers you can run yourself. Every broker with a secure WebSocket listener can be tested directly in your browser.
Test on the shared endpoint at broker.connectmq.com, then move to your own isolated broker with the same client code — no public strangers on your topics.
Open to everyone, no sign-up. Great for learning and quick checks — never for real data.
One of the most widely used public MQTT sandboxes. Open to everyone, no authentication.
Free public MQTT 5 broker operated by EMQ, reachable over TCP, TLS and WebSockets.
The classic Mosquitto test server, maintained by the Mosquitto project. Great for interoperability tests.
Public sandbox from the Eclipse IoT working group, with WebSockets on standard web ports.
Browsers can only use the WebSocket ports. Not sure which one you need? Read MQTT ports explained.
| Broker | Host | MQTT (TCP) | MQTT over TLS | WebSocket | Secure WebSocket |
|---|---|---|---|---|---|
| ConnectMQRecommended | broker.connectmq.com | 1883 | 8883 | 8083/mqtt | 8084/mqtt |
| HiveMQ Public Broker | broker.hivemq.com | 1883 | 8883 | 8000/mqtt | 8884/mqtt |
| EMQX Public Broker | broker.emqx.io | 1883 | 8883 | 8083/mqtt | 8084/mqtt |
| Eclipse Mosquitto Test Server | test.mosquitto.org | 1883 | 8883 | 8080 | 8081 |
| Eclipse Projects Broker | mqtt.eclipseprojects.io | 1883 | 8883 | 80/mqtt | 443/mqtt |
Prefer to run your own? These brokers are free to install — you take care of servers, TLS, updates and backups.
The lightweight classic. Ideal for a single server, Raspberry Pi or home lab.
Clustered broker with a rule engine for data integration. Check the licence of the version you deploy.
Open-source Java broker with an extension SDK. Clustering is part of the commercial Enterprise edition.
Small-footprint broker built for edge gateways and constrained hardware.
ConnectMQ gives you a private, managed broker with TLS and access control — no installation.
Try ConnectMQNot sure which one fits? Compare MQTT brokers side by side or generate a config with the mosquitto.conf generator.
Yes. You can connect to free public test brokers such as broker.connectmq.com, broker.hivemq.com, broker.emqx.io and test.mosquitto.org without an account, or install a free open-source broker such as Mosquitto on your own server.
Any public broker on this page works for quick tests. Run the speed test on the TestMQTT home page to see which one responds fastest from your location, and use a unique topic prefix so you only see your own messages.
They are fine for experiments, but anyone can subscribe to your topics and there is no authentication or uptime guarantee. Never send credentials or personal data through a public broker.
Not a public one. Production devices need a private broker with authentication, access control and TLS — either one you operate yourself or a managed broker such as ConnectMQ.