Free online tool

LoRaWAN Payload Decoder

Paste a LoRaWAN payload in hex or Base64 — or a full uplink JSON from ChirpStack or The Things Stack — and get human-readable values, a byte-by-byte explanation, and ready-to-use codecs.

Everything runs in your browser. No payload ever leaves your machine.

Try it: · ·

Device library

Each device page includes the payload structure, verified examples, a live decoder, and copy-paste codecs for ChirpStack and The Things Stack.

Dragino

LHT65

Temperature & humidity sensor with external probe

Open decoder →
Milesight

EM300-TH

Outdoor temperature & humidity sensor (IP67)

Open decoder →

Missing your device?

Request a decoder →

What this tool does

Auto-detects the input

Raw hex, Base64, or a complete uplink JSON copied from ChirpStack v4 or The Things Stack — the payload and FPort are extracted automatically.

Explains every byte

Beyond the final values, you see which bytes produced them, the endianness, and the scaling math — ideal for learning and debugging.

Gives you the codec

Each device page includes a decodeUplink() function that works as-is in ChirpStack v4 and The Things Stack payload formatters.

100% client-side

The decoding runs in your browser with plain JavaScript. Your payloads are never sent to any server.

Frequently asked questions

What is a LoRaWAN payload decoder? LoRaWAN devices transmit compact binary payloads to save airtime and battery. A payload decoder (or codec) converts those raw bytes into readable measurements like temperature, humidity, or battery voltage, following the format defined by each manufacturer.
Which input formats are supported? Raw hexadecimal (with or without spaces), Base64, and complete uplink JSON events from ChirpStack v4 or The Things Stack v3 — the tool finds the payload field automatically.
Can I use these codecs in ChirpStack or TTN? Yes. ChirpStack v4 and The Things Stack use the same decodeUplink(input) JavaScript signature, so the codec on each device page works in both — paste it into the device profile (ChirpStack) or payload formatter (TTN).
Is my payload sent to a server? No. The decoder is plain JavaScript running entirely in your browser.
My device is not listed — what can I do? If it uses Cayenne LPP, the generic decoder already works. Otherwise write to us with the device model and a payload example, and we will consider adding it to the library.
Where can I learn more about LoRaWAN? Yubox offers the free book «LoRaWAN para todos», the Yubox Gateway OS image to build your own gateway, and the hands-on LoRaWAN Master Training.

Building a LoRaWAN network?

Download Yubox Gateway OS to turn a Raspberry Pi into a LoRaWAN gateway, or join the LoRaWAN Master Training.

Yubox Gateway OS → Master Training →