GNU Radio now runs entirely in your browser
GNU Radio in the browser
GNU Radio World brings the full GNU Radio Companion experience to the browser. The DSP stack and Qt GUI sinks are compiled to WebAssembly, letting you design and run flowgraphs with live spectrum, waterfall, and constellation plots—no Python, installation, or server needed. It reads and writes native .grc files, includes example flowgraphs and IQ recordings, and supports RTL-SDR, PlutoSDR, and HackRF via WebUSB.
The GNU Radio DSP stack and the Qt GUI sinks are compiled to WebAssembly, so you can build a software-defined radio flowgraph, press Run, and watch live spectrum, waterfall and constellation plots — with no Python, no install and no server.
- thomashabets2
Oh that's cool!
I've set off time to blog about getting my broadband RF scanner (connecting to USRP B200 via WebUSB) to work in WASM.
It's basically https://blog.habets.se/2026/08/Broadband-RF-scanner-revisite..., but in the browser.
I also have an AX.25 decoder (https://thomashabets.github.io/ruwasm/) and plain old FM receiver (https://cement.retrofitta.se/tmp/rtlsdr-fm/) already. The latter two work with RTL-SDR, also via WebUSB, so no software installs or setup required.
I've been meaning to make a "GNU Radio in the Browser" (well, gnuradio-companion-like) for my RustRadio project to build flowgraphs without coding, but not gotten to it yet.
- jcims
I tinkered with gnuradio back when rtl-sdr just took off (2012ish?).
I had no background in dsp or signal processing and found it so opaque as to be unusuable, even though I saw more skilled folks do amazing things with it.
*scratches head*
Might give it another go.
- ghostly_s
No idea what I'm looking at, it's just combining some noise and a sawtooth wave to create pretty visuals I guess? if this is meant to serve as an introduction to the project it's not really succeeding. The "Description" isn't even readable despite most of the page being used for empty space. I guess it's expected to have no audio output? I presume the real purpose of this is to process signals from an actual radio?
The "Help"->"Help" menu item is notably unhelpful:
> For questions, comments, or suggestions, you can email [email protected], join the Discord server, or post a GitHub issue.
"Help"->"About" at least starts to clarify some things:
> GNU Radio, entirely in your browser — explore the open-source SDR ecosystem with zero install!
> GNU Radio World is a browser-based GNU Radio Companion flowgraph editor and WebAssembly runtime. You can place, connect, and configure blocks, then run the resulting flowgraph directly in your browser.
> It is designed to download only the WebAssembly modules corresponding to the blocks you use. This on-demand architecture keeps the initial download small and can support a limitless collection of out-of-tree modules (OOTs) in the future.
> GNU Radio World also includes a collection of real RF recordings that are downloaded only when you use them. You can inspect the recordings in the built-in recording view, adapted from IQEngine, and use them in the included flowgraph examples, allowing OOTs to be shown off with real recordings of […]