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  1. Home
  2. Audio Tools
  3. Instrument Tuner

Free Online Instrument Tuner

Tune your guitar, bass, ukulele, violin, or any instrument with precision. Real-time chromatic pitch detection with needle and strobe display modes. 100% free, 100% private.

To tune an instrument online for free: 1) Go to practicalwebtools.com/audio-tools/instrument-tuner, 2) Click "Start Tuning" and allow microphone access, 3) Select your instrument (guitar, bass, ukulele, violin, etc.), 4) Play a note and adjust tuning until the display shows green. The tuner works in any modern browser, runs 100% locally (your audio never leaves your device), and supports multiple tuning presets including Standard, Drop D, and chromatic mode.
Loading tuner...

Professional Tuner Features

Real-Time Pitch Detection

Advanced autocorrelation algorithm detects pitch instantly from your microphone. Works with any pitched instrument.

Dual Display Modes

Choose between classic needle gauge for quick tuning or precision strobe display for studio-quality accuracy.

Instrument Presets

Built-in presets for guitar, bass, ukulele, violin, viola, cello, mandolin, and banjo with multiple tuning options.

Reference Tone Generator

Play reference tones for any note with adjustable volume and waveform. Perfect for ear training and pitch matching.

Adjustable Reference Pitch

Set A4 from 415 Hz (Baroque) to 466 Hz (Chorton). Standard A440, A432, and orchestral A442 presets included.

100% Private

All audio processing happens in your browser. Your audio never leaves your device. Works offline after loading.

Supported Instruments

Our chromatic tuner works with any pitched instrument. Choose from built-in presets or use chromatic mode for any note detection.

Guitar
Bass
Ukulele
Violin
Viola
Cello
Mandolin
Banjo

Popular Guitar Tunings

Beyond standard EADGBE tuning, we support a wide variety of alternate tunings for different musical styles.

Standard

E A D G B E

Most common tuning

Drop D

D A D G B E

Heavy rock & metal

Half Step Down

Eb Ab Db Gb Bb Eb

Blues & rock

Full Step Down

D G C F A D

Heavy genres

Open G

D G D G B D

Slide guitar

DADGAD

D A D G A D

Celtic & folk

Key Features at a Glance

  • Free online chromatic tuner - works with any pitched instrument
  • Supports guitar, bass, ukulele, violin, viola, cello, mandolin, and banjo
  • Multiple tuning presets: Standard, Drop D, Half Step Down, Open G, DADGAD, and more
  • Adjustable reference pitch from A415 (Baroque) to A466 (Chorton)
  • Two display modes: needle gauge and precision strobe
  • Built-in reference tone generator to hear target notes
  • 100% browser-based - no app download required
  • Privacy-focused: audio never leaves your device
  • Works offline after initial page load
  • Real-time pitch detection with sub-cent accuracy

How to Tune Your Instrument

  1. 1

    Allow microphone access

    Click "Start Tuning" and allow your browser to access your microphone when prompted.

  2. 2

    Select your instrument

    Choose your instrument and tuning preset from the settings panel. For any note detection, use chromatic mode.

  3. 3

    Play a note

    Play a single string or note on your instrument. The tuner will detect the pitch automatically.

  4. 4

    Adjust until in tune

    Watch the needle or strobe display. Adjust your tuning peg until the indicator centers and turns green.

  5. 5

    Repeat for all strings

    Continue tuning each string until all show green. Use the reference tone generator if needed.

Frequently Asked Questions

How do I tune my guitar online?
Click "Start Tuning" to enable your microphone, select "Guitar" from the instrument dropdown, and play each string one at a time. The tuner will detect the pitch and show you whether to tune up or down. When the needle centers and turns green, your string is in tune.
What instruments can I tune with this tuner?
Our chromatic tuner works with any pitched instrument including guitar (acoustic and electric), bass, ukulele, violin, viola, cello, mandolin, and banjo. It also has a chromatic mode that detects any note, making it suitable for wind instruments, piano, and more.
What is the difference between needle and strobe display?
The needle display shows tuning deviation like a traditional analog tuner - easy to read at a glance. The strobe display uses rotating bars for higher precision - when perfectly in tune, the bars appear stationary. Strobe mode is preferred for fine-tuning and professional use.
Why is my tuner not detecting sound?
Make sure you've allowed microphone access when prompted. Check that your browser has permission to use the microphone in your system settings. Also ensure you're in a quiet environment and playing notes one at a time - the tuner works best with single clear notes.
What is reference pitch A440 vs A432?
A440 means the note A4 vibrates at 440 Hz, which is the modern standard concert pitch. A432 is slightly lower and some musicians prefer it. Historical pitch standards like A415 (Baroque) were even lower. Our tuner lets you adjust between 415-466 Hz.
Is my audio data private?
Yes, 100% private. The tuner processes audio entirely in your browser using your device's microphone. No audio data is ever sent to our servers or any third party. Your audio never leaves your device.
What are common guitar tunings?
Standard tuning (EADGBE) is most common. Drop D (DADGBE) is popular for rock and metal. Half Step Down and Full Step Down lower all strings. Open tunings like Open G (DGDGBD) and DADGAD are used for slide guitar and Celtic music.
Does this tuner work offline?
Yes, once the page is loaded, the tuner works completely offline. All processing happens in your browser. You can even add this page to your home screen for quick access.

Browser Support

This tuner uses the Web Audio API and MediaDevices API for microphone access. It works best in modern browsers with microphone support.

Chrome 49+Firefox 52+Safari 14+Edge 79+