BrowSDR - Web-Based SDR Receiver

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Radio

Center

MHz

Sample Rate

VFO {{ i + 1 }} OOB

Bandwidth

Snap Interval

De-emphasis

Squelch

{{ vfo.squelchLevel.toFixed(3) }}dB

IF Noise Reduction

Stereo

Low Pass

Decode RDS

Decode POCSAG

Advanced RDS Info

Volume

{{ vfo.volume }}%

Bookmarks

No bookmarks saved.

No bookmarks match your search.

DSP Stats {{ fps }} FPS

USB: {{ dspStats.usbFps }} cb/s | Chunk: {{ dspStats.chunkSize }} B

DSP: {{ dspStats.dspAvgMs }}ms avg / {{ dspStats.dspMaxMs }}ms max

Audio: {{ dspStats.audioFps }} calls/s | {{ dspStats.audioRate }} samp/s

Msgs: {{ dspStats.msgRate }} /s | Input: {{ (dspStats.inputRate/1e6).toFixed(2) }} MSa/s

Dropped: {{ dspStats.dropped }}

Active Audio

Live Transcription ● REC {{ whisper.recordDuration.toFixed(1) }}s Transcribing{{ whisper.pendingChunks > 1 ? ` (${whisper.pendingChunks} queued)` : '…' }} Listening Ready Error Idle

No transcriptions yet. Start Whisper and tune to a voice transmission.

{{ entry.time }} {{ entry.freq }} ({{ entry.duration }}) ⏱ {{ entry.transcribeTime }} {{ entry.text }}

Frequency Activity {{ sortedVfoActivity.filter(a => a.totalMs > 0 || a.isLive).length }} active

Enable squelch on VFOs to track their activity here.

Listening… activity will appear here when squelch opens.

#{{ rank + 1 }} VFO {{ item.index + 1 }} {{ item.vfo.freq.toFixed(4) }} MHz {{ vfoBookmarkLabel(item.index) }} ● LIVE {{ item.count }}× {{ formatActivityDuration(item.totalMs) }}

Import Bookmarks

How would you like to import?

Save {{ bookmarkModal.type === 'individual' ? 'FREQ' : 'GROUP' }} Bookmark

Category

Connected Clients

No clients connected

{{ client.country }} {{ formatFreq(client.firstFreq) }} MHz {{ client.vfoCount }} VFO{{ client.vfoCount !== 1 ? 's' : '' }} RELAY

Connected {{ remoteClientDuration(client.connectedAt) }}

Select SDR Device

{{ entry.productName || 'USB ' + entry.device.vendorId.toString(16) + ':' + entry.device.productId.toString(16) }}

Connect to Remote SDR

Recent Connections

BrowSDR Browser-based Software Defined Radio

A blazing-fast, zero-install SDR receiver that runs entirely in your browser. Connect a USB SDR device or join a shared remote session and start listening instantly.

WebUSB — Zero Install

Connects directly to HackRF and RTL-SDR hardware via WebUSB. No drivers, no software, no plugins — just open the browser and go.

Multi-VFO Reception

Listen to multiple frequencies simultaneously, each with its own color, mode, squelch, volume, and audio filters.

Remote SDR Sharing

Share your SDR with remote listeners via WebRTC. Clients connect with a share link. Host can lock settings and manage connected clients.

Whisper AI Transcription

Live speech-to-text using OpenAI Whisper running locally in your browser. Supports English-only and multilingual models up to 800 MB.

Frequency Activity Tracker

Automatically tracks squelch-open time and transmission count per VFO. Ranks active frequencies and shows live transmission indicators.

POCSAG Pager Decoder

Real-time POCSAG pager decoding on any NFM VFO. Displays capcode, message type, baud rate, and message text with export support.

Demodulation Modes

NFM, WFM (with stereo & RDS), AM, USB, LSB, DSB, CW, and RAW — all decoded in real-time via WebAssembly DSP.

Waterfall & Spectrum

Real-time FFT spectrum and scrolling waterfall with adjustable zoom, pan, and brightness. Hover to read exact frequencies.

Bookmarks

Save individual frequencies or full multi-VFO group presets. Organize by 15+ categories, search, and import/export as JSON.

FM RDS Decoding

Decode Radio Data System (RDS) metadata from WFM stations. Supports EU and North America regional settings.