Answers to the most common questions about violin tuning, the online tuner tool, string physics, and violin technique as it relates to tuning and intonation.
About the Tuner Tool
Do I need to download anything to use the tuner?
No. The tuner runs entirely in your browser. Open the page, click Start, grant microphone access when prompted, and begin tuning. No downloads, no app installation, no account required.
Is my violin being recorded when I use the tuner?
No. All audio processing happens in real time inside your browser using the Web Audio API. Your playing is never uploaded to any server, never saved as a file, and never retained after you close the page. When you stop the tuner or leave the page, no audio data exists anywhere. Full details are in the Privacy Policy and Data Security pages.
Which browser works best?
Google Chrome on a desktop or laptop gives the most consistent results. Firefox and Safari work in most cases. In-app browsers opened from inside Instagram, Facebook, or TikTok have restricted microphone access and frequently fail. If the tuner is not responding, switch to Chrome on a desktop first before trying anything else.
Should I bow or pluck the string when using the microphone tuner?
Bowing gives a more sustained tone which the pitch detection algorithm can analyse more reliably than a short plucked note. However, bowing must be done with consistent, supported tone — not a scratchy or breathy bow stroke, which introduces noise that reduces detection accuracy. If you are a beginner and your bowing is inconsistent, plucking is a valid alternative for initial tuning. Once the string is approximately in tune, try bowing to confirm.
What does the cents reading mean?
A cent is one hundredth of a semitone — the smallest unit of pitch used in tuning measurement. A reading of 0 cents means the string is perfectly in tune. A reading of +12 cents means the string is 12 cents sharp (too high in pitch). A reading of −8 cents means the string is 8 cents flat (too low). Most listeners begin to perceive a note as out of tune at approximately 10–15 cents deviation. Professional players and trained ears notice deviation as small as 5 cents in sustained notes.
What is the reference tone mode and when should I use it?
The reference tone mode plays the correct pitch of each string as a pure sine wave tone through your speakers or headphones. You tune by ear — bow your string alongside the reference tone and listen for beats (a rhythmic pulsing caused by two nearby but unequal frequencies). When the beats disappear, the string matches the reference pitch.
Use reference tone mode to train your ear alongside the visual display. Professional string players tune this way routinely — developing pitch sensitivity that allows you to hear when something is out of tune without needing to check the screen.
Violin Tuning Basics
What are the standard violin string notes and frequencies?
The four open strings of the violin in standard tuning are:
| String | Note | Frequency |
|---|---|---|
| 4th (lowest, thickest) | G3 | 196.00 Hz |
| 3rd | D4 | 293.66 Hz |
| 2nd | A4 | 440.00 Hz |
| 1st (highest, thinnest) | E5 | 659.25 Hz |
These frequencies correspond to A4 = 440 Hz (standard concert pitch). The strings are tuned in perfect fifths — each string is a fifth above the one below it.
Why are violin strings tuned in perfect fifths?
The perfect fifth (frequency ratio of approximately 3:2) is the interval that defines the violin family’s characteristic resonance and tone. Tuning in fifths means the open strings produce natural harmonic relationships with each other and with the notes produced on adjacent strings, which reinforces resonance, projection, and the warm, carrying quality of string instrument tone. The system has been used in violin-family instruments since at least the 16th century.
In what order should I tune the strings?
The standard recommended order is: A first, then D, G, E.
Start with A because A4 = 440 Hz is the universal reference pitch and can be matched against any reference tuner, tuning fork, or other instrument. With A confirmed, tune D a fifth below A, then G a fifth below D. Tune E last — the E string is the thinnest, under the highest tension, and most prone to snapping if over-tensioned while you are adjusting the other strings.
Some teachers recommend checking all four strings and then re-checking A at the end, since tightening one string can affect the tension balance of the instrument slightly.
When should I use fine tuners versus pegs?
Fine tuners (the small metal adjusters on the tailpiece) are designed for small pitch corrections — within approximately 10 to 20 cents of the target pitch. They work by adjusting string tension slightly through a mechanical screw. Fine tuners are easy to use, offer good control, and are appropriate for routine daily tuning once strings are approximately in tune.
Pegs (the wooden friction pegs at the scroll) are used for larger corrections — when a string is significantly out of tune, or when a new string has been fitted. Pegs require careful handling: turn slowly, push inward slightly as you turn to maintain friction, and release gradually. Over-tightening a peg quickly is the most common cause of string breakage.
Most student and intermediate violins have fine tuners on all four strings. Advanced and professional instruments often have fine tuners on the E string only (since E is under the highest tension and most sensitive) with the other strings adjusted by peg.
Why does my violin go out of tune so quickly?
Several factors cause violin tuning instability:
Temperature and humidity changes. Wood expands and contracts with changes in ambient temperature and humidity. Moving a violin from a cold case into a warm room, or from dry indoor air into humid outdoor air, can cause noticeable pitch drift within minutes.
New strings. New strings are not yet fully stretched to their working tension. They will go flat repeatedly in the first few hours of playing. Tune up, play for 10–15 minutes, retune, and repeat. Strings typically stabilise after 2–4 hours of playing time spread over a few days.
Peg slippage. Wooden pegs can slip back under string tension if they are dry (causing them to lose friction) or if they were not pushed firmly inward when last set. Peg compound can help maintain friction.
Playing demands. Aggressive playing, position shifts, and vibrato can cause gradual pitch drift. Check tuning regularly during long practice sessions.
What is A440 and what other reference pitches are used?
A440 means A4 = 440 Hz — the internationally standardised concert pitch used as the reference for equal temperament tuning worldwide since the 20th century. It is the correct reference for the vast majority of violin playing contexts.
A441–444 is used by many professional orchestras, particularly in Europe. A442 and A443 are the most common orchestral pitches. If you are playing in an orchestra or ensemble, confirm their reference pitch before tuning.
A415 is the historical Baroque pitch — approximately one semitone below A440 — used in period performance practice for music from the Baroque era. If you play Baroque violin or perform with a period ensemble, your instrument may need to be set up for A415 string tension.
Can I use this tuner for viola or cello?
The tuner detects pitch across a wide frequency range and will function for viola, cello, and other string instruments. Viola strings (C3, G3, D4, A4) and cello strings (C2, G2, D3, A3) are within the detection range. For best results, ensure the tuner’s reference pitch matches the instrument’s intended tuning standard. The tuner is optimised and labelled for violin (G, D, A, E) but functions as a chromatic pitch detector for any instrument.
About This Website
Who runs OnlineViolinTuner.com?
OnlineViolinTuner.com is founded and maintained by Mason, a violin tuning educator and music tools developer. Mason researches and writes all content on the site — tool pages, educational articles, and supporting content. The site is independent and not affiliated with any music school, instrument manufacturer, or conservatoire.
Is the content on this site written by AI?
AI tools may be used as part of the content drafting process. Every piece of content published on this site is personally reviewed, fact-checked, and edited by Mason before publication. No unreviewed AI output is published. The full policy is in the Editorial Guidelines.
How do I report an error or get in touch?
Use the Contact page. All messages are reviewed personally by Mason. For technical issues, include your browser and device details. For content errors, include the URL and the specific claim you believe is incorrect.
Have a question not answered here? Use the Contact page and we will respond promptly.
Last updated: June 2026 — Mason, OnlineViolinTuner.com