Web Bluetooth BLE Explorer

Connect to Bluetooth Low Energy devices wirelessly from your browser. Explore GATT services, read and write characteristics, and stream live sensor data. No drivers, no app install. Chrome/Edge only.

No device connected

About this tool

A full GATT browser for any Bluetooth Low Energy peripheral — ESP32-based sensors, Arduino, health monitors (heart rate, thermometers), fitness trackers, and custom IoT nodes. Runs entirely in the browser using the Web Bluetooth API; no drivers, no native app, no server upload.

What you can do

Explore all GATT services and characteristics on the device
Read any readable characteristic — values decoded as hex, UTF-8, integers, or floats
Subscribe to notifications (NOTIFY / INDICATE) — live values stream into the log and sparkline
Write to writable characteristics — raw hex bytes or UTF-8 text
Standard GATT UUIDs auto-labelled (battery, heart rate, temperature, device info, Nordic UART…)

ESP32 tips

Flash your ESP32 with any BLE GATT server sketch — the Arduino BLE2902 descriptor enables notifications
The Nordic UART Service (NUS) is auto-detected; TX characteristic streams into the notification log
Use custom 128-bit service UUIDs — the explorer lists all services regardless of UUID format
Ensure your device is advertising before scanning; BLE devices stop advertising after pairing in many firmwares

Browser support

Web Bluetooth requires Chrome 56+ or Edge 79+ on desktop or Android. iOS Safari, Firefox, and desktop Safari do not support this API. The page shows a banner on unsupported browsers.