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Online Guitar Tuner

Free chromatic tuner with real-time pitch detection. Tune your guitar, bass, ukulele, or any instrument using your microphone.

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-- Hz
-50¢ 0 +50¢
0 cents
Click Start to begin tuning

How to Use This Guitar Tuner

  1. Grant Microphone Access: Click "Start Tuner" and allow microphone access when prompted.
  2. Select Your Tuning: Choose a tuning preset (Standard, Drop D, etc.) or use chromatic mode for any note.
  3. Play a String: Pluck one string at a time and let it ring out clearly.
  4. Read the Display: The detected note will appear on screen with cents deviation.
  5. Adjust Your Tuning: If the indicator is left (flat), tighten the string. If right (sharp), loosen it.
  6. Green = In Tune: When the indicator is centered and green, your string is perfectly tuned!

Tune Your Guitar Accurately in Real Time

This online guitar tuner is a browser-based tuning tool designed to help musicians tune guitars and other string instruments accurately in real time using microphone input. It works directly in your browser without downloads, making it suitable for acoustic, electric, bass, ukulele, and extended-range guitars, including 6-string, 7-string, 8-string, and 12-string guitars.

The tuner supports standard tuning, chromatic tuning, half-step and full-step down tuning, drop tunings, and custom reference pitch workflows, making it useful for both beginners and experienced players.

🎸 Guitar Tuner Tool (Live Interface)

Microphone-based pitch detection with visual tuning feedback.

This tuner works on desktop, laptop, and mobile devices, and can be used as a free guitar tuner online without installing an app or plugin.

Supported Instruments & String Configurations

  • 6-string guitars (acoustic, electric, classical)
  • 7-string guitars, including baritone and drop tunings
  • 8-string guitars and extended-range instruments
  • 12-string guitars (paired-string tuning)
  • Bass guitars (4-string and 5-string)
  • Ukulele, mandolin, violin, and other chromatic instruments

What This Guitar Tuner Does

This tool analyzes incoming sound waves captured by your device’s microphone and compares the detected frequency against musical reference pitches. It identifies the closest note and displays whether the pitch is flat, sharp, or in tune, helping guide tuning adjustments visually.

Supported Tuning Modes

Standard Guitar Tuning

E2 – A2 – D3 – G3 – B3 – E4

Chromatic Tuning Mode

Detects all musical notes without restriction.

Alternate & Open Tunings

  • Drop D, Drop C, Drop B
  • Open G, Open D
  • Double Drop D
  • Baritone and low-register tunings
  • Custom reference pitch setups

Step-Based & Micro-Tuning Workflows

  • 1/2 step down or up
  • 1 step down or up
  • Quarter-step adjustments for fine tuning
  • Fine calibration for recording and live performance

How the Guitar Tuner Works

Audio Input Analysis

The tuner uses live microphone input from your device to capture sound waves as you play each string.

Frequency Detection

Sound waves are converted into frequency values (Hz) and matched to the nearest musical note using digital pitch-detection methods.

Pitch Deviation Display

The interface shows whether the detected pitch is flat, sharp, or centered (in tune).

Understanding the Tuning Indicator

  • Centered indicator → string is in tune
  • Left movement → pitch is flat
  • Right movement → pitch is sharp

Reference Pitch & Calibration

  • Default reference pitch: A = 440 Hz
  • Alternate pitches: 432 Hz, 444 Hz, 455 Hz
  • Manual calibration using chromatic detection

Accuracy & Limitations

  • Microphone quality
  • Device hardware
  • Browser audio processing
  • Environmental noise
  • Low-frequency string detection may fluctuate
  • Harmonics and string decay can affect readings

Professional & Advanced Use Cases

  • Home Practice
  • Recording Preparation (rough tuning before fine intonation)
  • Teaching & Learning
  • Multi-Instrument Sessions
  • Fine-tuning for stage or studio instruments

Online Guitar Tuner vs Physical Tuners

This tool is designed for accessibility and everyday use, not as a replacement for professional stage equipment. Comparison includes:

  • Web/Browser Tuners: No installation, depends on microphone input
  • Mobile App Tuners: Similar capabilities with portability
  • Hardware/Pedal Tuners: Dedicated processing, more accurate for live performance
  • DAW Plugins: Integrated with recording software, precise tuning for tracks

Privacy & Microphone Usage

  • Microphone access is used only during active tuning
  • No audio is recorded or stored
  • All processing occurs in real time

Frequently Asked Questions

Yes, but a tuner provides faster and more accurate results, especially for beginners.

Yes. Modern browser-based tuners using microphone input can provide reliable tuning for most practice and setup needs.

Yes, as long as the browser supports microphone access.

Minor movement is normal due to string vibration and ambient sound.

Make sure you've granted microphone permission, your microphone is working, and you're in a quiet environment. Try playing the string closer to your device's microphone and let it ring out fully.

A cent is 1/100th of a semitone. When the cents display shows 0, you're perfectly in tune. Negative cents mean flat (too low), positive cents mean sharp (too high). Most people can't hear a difference of less than 5 cents.

A4 = 440Hz is the international standard and is recommended for most situations. 432Hz is an alternative tuning some musicians prefer for its warmer sound. Use 440Hz unless you have a specific reason to use another reference.

Yes! This is a chromatic tuner, so it can detect any pitch. It works great for guitar, bass, ukulele, violin, cello, wind instruments, and even voice. Just select the appropriate preset or use chromatic mode.
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