Web Bluetooth Tester

Connect to Bluetooth Low Energy devices and inspect their services directly in your browser.

Secure (SSL)

Client-Side Processing

100% Free

Go to tool

Instructions

1

Enter data
Enter content, paste text or load a file from disk.
2

Click the button
The tool will immediately process your data in the browser.
3

Get the result
Copy the finished text or save the file to your device.

                                                function runTool() {

                                                  return "Result ready in 0.1s";

                                                }

Settings

Action

Allow all Tool Option

Service uuid

Optional services

Include env Tool Option

Input data

376 characters

Result

raw: { "generated_at": "2026-02-23T09:15:00.000Z", "action": "check", "checks": { "secure_context": true, "protocol": "https:", "user_gesture_required": true }, "web_bluetooth": { "supported": true }, "events": [ { "type": "info", "message": "Capability check completed." } ] }

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Web Bluetooth Tester - Diagnostics and communication with BLE devices online

Web Bluetooth Tester is a modern online tool created for programmers, IoT engineers and electronics enthusiasts who want to establish a direct connection to Bluetooth Low Energy (BLE) devices from a web browser. Thanks to the Web Bluetooth API technology, it is possible to wirelessly search, pair and communicate with microcontrollers, medical sensors or intelligent toys without the need to install any external software or dedicated mobile applications. Our tool provides a clear interface for scanning services, reading and writing characteristics, which significantly speeds up the process of prototyping and debugging embedded systems.

What is Web Bluetooth API and how is it revolutionizing application development?

Web Bluetooth API is a modern standard developed by the W3C working group that enables web applications to communicate securely and in a controlled manner with Bluetooth Low Energy peripherals. Traditionally, to connect to a BLE device, developers had to create native apps for Android, iOS, Windows or macOS, which required maintaining multiple code repositories and going through certification processes in app stores. Web Bluetooth eliminates these barriers by allowing you to write a single JavaScript code that runs on any supported platform directly in the browser. Security is a key element of this standard - a connection can only be initiated by conscious user action (clicking a button), and the website must be served over the secure HTTPS protocol, which prevents unauthorized access to user devices.

How to use the Web Bluetooth tester step by step?

Getting started with our tester is extremely simple and intuitive. First, make sure that the Bluetooth module on your computer or phone is turned on and that the browser you use supports this standard. After clicking the scan button, the browser will display a system dialog box with a list of detected nearby BLE devices broadcasting their services. The user selects the device of interest and clicks the pairing button. After successful connection, the tester will automatically query the device about the structure of its services (GATT Services) and related characteristics (GATT Characteristics). The tool's interface allows you to interact with these elements - you can read numerical or text values, send your own commands to write data to the device, and subscribe to Notifications, thanks to which sensor data will be updated on the screen in real time.

Browser and operating system compatibility

Support for the Web Bluetooth API continues to grow, although there are still some limitations depending on the platform and software vendor. Currently, this standard is fully supported by Chromium-based browsers such as Google Chrome, Microsoft Edge, Opera and Brave on Windows, macOS, Linux, ChromeOS and Android. It is worth remembering that Apple blocks access to Web Bluetooth in its Safari browser on iOS and macOS for privacy and security reasons, so users of Apple devices must use alternative browsers that support this protocol (e.g. Bluefy) or test solutions on other systems. Our tester constantly checks the availability of the API in your browser and, if there is no support, displays an appropriate information message along with tips on how to enable this function in advanced settings.

Application of Web Bluetooth technology in practice

Applications of Web Bluetooth API are extremely wide and cover many branches of technology. In medicine, it allows for direct reading of data from pulse oximeters, glucometers or smart scales directly to patient panels in the cloud, without the use of complicated applications. In education, it facilitates the control of robots and programmable toys from simple e-learning platforms. In turn, in industry and home automation, it allows service technicians to quickly diagnose machines or configure routers and IoT controllers using a smartphone or laptop and a regular website. The Web Bluetooth Tester reduces the time needed to verify whether a given device communicates correctly and responds to standard GATT queries, becoming an essential tool in the toolbox of a modern IoT developer.

Frequently asked questions

Is Web Bluetooth safe for my devices?

Yes, Web Bluetooth has been designed with maximum security in mind. A website cannot arbitrarily connect to any device in the background - this requires the user to physically click a button and select the device from the system list. Additionally, HTTPS is required.

Which browsers fully support the Web Bluetooth API?

The main browsers supporting this tool are Google Chrome, Microsoft Edge and Opera in versions for desktop computers and Android devices. Safari and Mozilla Firefox browsers do not support this standard by default.

What is the GATT profile and how does it work on BLE devices?

GATT (Generic Attribute Profile) defines how two BLE devices exchange data with each other. The data is organized in a hierarchical structure consisting of Services, which group related functions, and Characteristics, which represent specific values or data points.

Why doesn't the tester detect my Bluetooth device?

The most common reasons are: the Bluetooth module on the computer/phone is disabled, the BLE device is not in advertising mode, it is already connected to another phone/computer, or the browser does not have system permissions to use Bluetooth.

Can I transfer files using Web Bluetooth?

Bluetooth Low Energy (BLE) technology is optimized for low power consumption and the transmission of small data packets (e.g. measurements from sensors). Although theoretically it is possible to transfer files in small portions, in practice, classic Bluetooth or Wi-Fi is better for large transfers.