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Audio Test – Free Online Speaker, Headphone & Stereo Test Tools

Four free online audio test tools: Stereo test, Frequency sweep, Bass test, Tone generator. Web Audio API, PWA, no ads.

🎧 Stereo Channel Test

Test your left & right speakers with real-time audio waveform visualization.

No microphone access needed — all audio is generated locally.

Keyboard: L/R/B = channels, 1/2/3 = modes, Esc = stop

Frequency440Hz
Left Channel
Right Channel
🎧 Use headphones for best results
About

This is a free, open-source stereo channel test tool. No ads, no tracking. Test your left/right speakers, headphones, or soundbar. Uses the Web Audio API — works offline as a PWA. All audio is generated locally in your browser.

GitHub →

🎛️ All Audio Test Tools

🎧Stereo Test

L/R channel test

📊Frequency Sweep

20Hz–20kHz sweep

🔊Bass Test

Subwoofer test

🎵Tone Generator

Pure tone generator

🛒 Test complete? Check these recommendations

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KZ ZS10 Pro

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💡 5-driver hybrid IEM with pinpoint imaging. If your stereo test reveals channel issues, these $49 IEMs outperform headphones 5× the price.

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Sony WH-1000XM5

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💡 Industry standard ANC headphones with impeccable stereo imaging. If your test shows imbalance, these will reveal exactly what you're missing.

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FiiO KA11

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💡 Tiny USB-C DAC that dramatically improves channel separation on phones/laptops. No more noisy headphone jacks ruining your stereo test.

As an Amazon Associate we earn from qualifying purchases. Prices as displayed on Amazon.

💡 Frequently Asked Questions

How does the stereo channel test work?▼
Click L to play a tone through your left speaker only, R for the right speaker. The real-time waveform visualization shows you exactly which channel is active. Use headphones for the most accurate test.
What does it mean if one channel is quieter?▼
Channel imbalance can be caused by: dirty headphone jack, damaged cable, speaker driver issues, or software balance settings. Try swapping L/R to isolate the problem.
Can I test surround sound with this tool?▼
This tool tests stereo (2-channel) audio. For 5.1/7.1 surround testing, each channel pair would need separate testing. Check our frequency sweep tool for multi-speaker calibration.
Is this tool free? Do I need to download anything?▼
Completely free. No downloads, no sign-up. Works in your browser using Web Audio API. Also works offline as a PWA — add to home screen for instant access.
What headphones do you recommend for accurate stereo testing?▼
Studio monitor headphones like Audio-Technica ATH-M50x or Sennheiser HD 560S offer flat frequency response for accurate testing. Consumer headphones often boost bass and treble, which can mask channel issues.