WATAR
Violin Tuner
Free violin tuner for standard G-D-A-E tuning, right in your browser — ideal for a quick check before practice or a lesson.
Tune your violin online
Your microphone audio is analyzed live in your browser using the Web Audio API and is never recorded, saved, or sent anywhere — the same on-device-only approach the Watar app itself uses. Requires a secure (https) connection; works in current Chrome, Safari, Firefox, and Edge.
Standard Violin tuning
| String | Note | Frequency |
|---|---|---|
| G (lowest) | G3 | 196.00 Hz |
| D | D4 | 293.66 Hz |
| A | A4 | 440.00 Hz |
| E (highest) | E5 | 659.25 Hz |
● Tune the A string first against a reference, then tune the others relative to it using the fifths between adjacent strings.
● Turn pegs slowly — violin pegs can slip or stick; fine tuners on the tailpiece give finer control for small adjustments.
● Bow each string individually rather than plucking for the steadiest pitch reading.
Frequently asked questions
- What is standard violin tuning?
- Standard violin tuning, low to high, is G3 D4 A4 E5 — each string a perfect fifth above the last.
- Why does my violin go out of tune so quickly?
- New strings, temperature and humidity changes, and loose pegs are the most common causes. It's normal to check tuning before every practice session.
- Is 440 Hz always correct for A?
- 440 Hz (A4) is the modern standard, but some orchestras tune to 442 Hz. The Watar app lets you switch the reference pitch between 440, 442, 432, and 415 Hz.
Get the full Watar app
The browser tuner above is free and always will be — no install needed. For practice mode, drone/reference tones, auto string detection, a metronome, and offline use, install the Watar app.
Tune another instrument
Playing something else? Watar's app supports 11 instruments and 30+ tuning styles, including a fully custom slot for anything not listed. Set up a custom tuning →