Free Online Audio & AV Testing Tools
Test speakers, headphones, microphones, webcams, and A/V sync directly in your browser. No installs. No uploads. Privacy-first.
How do I test my speakers online?
Use the Speaker Test to check left/right channels, confirm output, and listen for distortion.
Does AVTester upload audio?
No. Tests run locally in your browser audio is not uploaded, stored, or tracked.
Is this accurate?
Great for troubleshooting and learning, but not a replacement for professional measurement hardware.
Can I control Speaker Test remotely?
Yes. Open Remote on the Speaker Test page and scan the QR code to control it from your phone.
New: Remote Speaker Test (phone-friendly)
Open the Speaker Test on your PC or laptop, then scan the on-screen QR code to control left/right/pink noise and demo tracks from your phone. Handy when the laptop is plugged into an amp, on a lectern, or tucked away in an AV cupboard / rack.
Who AVTester is for
- Home users checking speakers or headphones
- Schools and classrooms testing equipment
- IT technicians doing quick diagnostics
- Creators testing audio output
AVTester focuses on fast, practical checks. If something sounds wrong, you can confirm the basics in seconds before diving into cables, and settings.
Tools
Each tool is browser-based and designed for simple real-world troubleshooting.
Speaker Test
Check left/right channels and distortion.
Tone Generator
Generate test tones across frequencies.
Sound Meter
Approximate volume checks via mic.
Mic Test
Confirm mic input and permissions.
Webcam Test
Preview camera and basic settings.
AV Sync Test
Spot obvious audio delay and lip-sync issues.
Important limitations
AVTester is designed for general diagnostics and education. It does not replace professional measurement or calibration equipment. Results depend on your device, browser, operating system, and environment.
Why bother testing your audio and video equipment?
Audio problems are easier to fix when you can test one part of the setup at a time. Built-in operating system test sounds usually only confirm that some audio is coming out of some speaker. They rarely tell you which channel is broken, whether the polarity is wrong, whether your headphones are connected the way you think they are, or whether what you're hearing is the speakers doing their job or the room making your bass disappear.
AVTester gives you separate checks for common audio and video issues. The Speaker Test plays clearly-labelled left and right tones so you can confirm channel orientation. The Tone Generator lets you sweep through specific frequencies, which can help with finding rattles, room peaks, or missing bass. The Microphone Test shows live input level so you can confirm a mic is working, and the AV Sync Test helps you spot obvious delay from a TV, soundbar, Bluetooth headphones, or browser audio route.
Everything runs in modern browsers using the Web Audio API and getUserMedia, both of which are supported in Chrome, Edge, Firefox, Safari, and most mobile browsers. There's no software to install, no driver to update, and no account to create — which also means nothing is being recorded or sent anywhere.
Common audio problems — and how to diagnose them
Only one speaker is working
Use the Speaker Test to play a left-only tone, then a right-only tone. If both come out of the same physical speaker, your channels are reversed at some point in the chain — usually the cable, the amp's input wiring, or the operating system's channel mapping. If one channel produces no sound at all, swap the speaker cables left-to-right to isolate whether the problem is in the speaker or upstream of it.
Bass sounds weak or boomy
Use the Tone Generator to sweep slowly between 20 Hz and 200 Hz. You'll usually hear obvious gaps (room nulls) and obvious bumps (room modes) at specific frequencies. Moving the listening position by even 30 cm often makes a big difference because the worst nulls are localised to specific points in the room.
My microphone "doesn't work"
Most "broken mic" problems are actually permission problems, the wrong input device being selected, or muting at the OS or hardware level. The Mic Test shows the live signal as a waveform so you can immediately tell whether your mic is producing any signal at all, and which device the browser is actually capturing from.
Lip-sync is off on my TV or Bluetooth headphones
Bluetooth audio and TV picture processing can both add noticeable delay, and the amount varies a lot by device, codec, and TV mode. The AV Sync Test plays a flash-and-click pattern so you can subjectively judge whether timing is visibly off, then try an audio-delay setting where your TV, soundbar, or player app provides one, or switch to a wired connection.
Browser and device compatibility
The audio tools (Speaker Test, Tone Generator, Surround Test, Water Eject, Local Player) work in any modern browser from the last few years — Chrome, Edge, Firefox, Safari, Brave, Opera, Vivaldi, and the in-app browsers used by most password managers. They also work on iOS and Android, although the operating system's media volume slider applies on top of any browser-level volume control.
The microphone and webcam tools require getUserMedia permission. The first time you use them, your browser
will pop up a permission prompt — choose "Allow" to proceed. We never see the resulting stream; permission is granted
directly to the page running on your device, and processing happens in your browser's audio/video pipeline. If you
accidentally deny permission, you can usually re-enable it via the padlock icon in your browser's address bar.
Some corporate or school environments restrict microphone and camera access at the policy level. If a tool says it can see no devices despite working in another browser, it's worth checking with your IT team rather than assuming the page is broken.
FAQ
What tools does AVTester include? ▾
Can I control the Speaker Test remotely from my phone? ▾
How do I test my speakers online? ▾
Does AVTester upload my audio or video? ▾
Is AVTester accurate for professional use? ▾
About AVTester
AVTester is part of a collection of independent tools created by Inline Computers, focused on fast, useful, privacy-respecting web utilities.
If you spot a bug or want a new tool, use the contact page.