🔒 Your files stay on your device — core audio processing runs locally. Privacy details →
Find a toolCtrl K
Free · In-browser · No upload

Free Online Autotune for Vocal Pitch Correction.

Tune a dry solo voice in Auto, Graph, Live or four-voice Harmony mode. Choose a key or MIDI targets, shape expression and formants, edit note objects, compare the measured result, and export locally.

Before-and-after illustration of Auto-Tune: Raw vocal melody becomes Tuned vocal through Snap notes to key.
Before → process → afterSee the signal story, then hear it in the workspace.

VOICE DETAIL MAP

Pitch Correction Grid

Keep speech intelligible while changing only the target detail. The voice path makes phrases, breaths, consonants and tonal character visible as separate decisions instead of treating dialogue as one uniform waveform.

Before-and-after illustration of Auto-Tune: Raw vocal melody becomes Tuned vocal through Snap notes to key.
Raw vocal melodySnap notes to keyTuned vocal
A speech-aware signal path: local voice events are identified, processed within bounded spans and returned to a continuous phrase.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Raw vocal melody

    Start with the right material

    Dry solo vocals with stable pitched phrases, a known song key and enough level to separate voiced notes from breaths and background noise.

  2. Snap notes to key

    Understand the transformation

    Confidence and level gates classify voiced analysis hops. Auto renders bounded exact-frame correction, Graph applies editable note-object targets and timing, Live uses a conservative AudioWorklet microphone monitor, and Harmony mixes up to four independently shifted, leveled and panned voices.

  3. Tuned vocal

    Verify the usable result

    Shared-playhead Source/Tuned audition, an editable pitch map, optional live monitoring, four-voice Harmony, WAV/MP3 export, before-to-target note and cents data plus a processing receipt with exact output dimensions.

Pitch deviation

Where this workflow stops

Backing music, polyphonic material, heavy reverb, growls and unstable fundamentals can confuse any monophonic tracker. Live is an experimental headphone monitor with browser and hardware latency; HQ formant guard compensates a broad spectral envelope but is not physical throat modelling.

THREE-PASS CHECK

Make the final decision by ear

  • Listen to complete phrases so edits retain natural timing.
  • Protect consonants and breaths that carry intelligibility or emotion.
  • Compare on both headphones and ordinary speakers before delivery.
Input
Microphone or browser-decodable audio such as WAV, MP3, OGG and M4A; accepted size is planned from decoded PCM memory, not a fixed compressed-file cap.
Output
Exact input frames, sample rate and channels; tuned preview plus 16-bit WAV or 320 kbps MP3.
Best source
One dry monophonic voice. Full mixes, chords, doubled vocals and heavy reverb confuse single-pitch tracking.
Memory guard
Additional decoded-PCM work is refused above about 256 MiB on mobile or 512 MiB on larger viewports.

How to auto-tune a voice online for free

  1. Press Record from microphone for a new take, or load an existing browser-decodable voice file.
  2. Choose the key and scale, accept a local key suggestion, build a custom or modal scale, or connect MIDI and hold the target notes.
  3. Choose Modern or Classic correction, HQ or low-latency rendering, then set Retune, Flex, Humanize, formant guard, transpose and detector controls.
  4. Press Tune voice. Low-confidence, quiet and out-of-range analysis frames stay unchanged instead of being forced to a note.
  5. Use Graph mode for pitch center, drift, modulation, target and bypass edits; optionally add up to four harmony voices, then export WAV or MP3.

Free online autotune with evidence, not a black box

Need to auto-tune a voice online for free without creating an account? The selected recording is decoded and processed in this browser. The interface exposes the detector threshold and every correction control, then reports accepted voiced share, corrected regions, average and maximum shift, skipped frames, exact output dimensions, peak and clipping. The receipt describes measured work on this file rather than promising a studio-grade result.

How the pitch correction works

The engine mixes a temporary analysis signal to mono, examines roughly 85 ms frames at 48 kHz every 45 ms, and estimates one fundamental with a bounded YIN cumulative-mean normalized difference function. A frame must clear both minimum voiced level and confidence. The nearest permitted scale note becomes the target; strength scales that move, retune smoothing slows abrupt changes, and the selected correction range can reject it. Accepted consecutive frames become note regions, shifted locally with overlapping WSOLA grains and 12 ms region-edge crossfades. The result is written into a buffer with the input's exact frame count, sample rate and channels.

Limits and browser support

This is conventional monophonic browser DSP, not AI. It includes manual note-object editing, vocal-derived key suggestions, live monitoring, MIDI targets, broad spectral-envelope formant compensation and four fixed-interval harmony lanes. It is still not a DAW plug-in with host automation, ARA transfer, a proprietary throat model or guaranteed sub-3 ms latency. A chord, full mix, doubled vocal or overlapping speakers do not present one unambiguous fundamental, so estimates can be wrong or skipped. Microphone, MIDI and recording workflows require browser permission and compatible APIs.

Auto-Tune: quick answer and technical limits

Quick answer: A local vocal pitch-correction tool that uses bounded YIN/CMNDF tracking to move confident monophonic regions toward a selected key and scale.

Best for
Dry solo vocals with stable pitched phrases, a known song key and enough level to separate voiced notes from breaths and background noise.
How it works
Confidence and level gates classify voiced analysis hops. Auto renders bounded exact-frame correction, Graph applies editable note-object targets and timing, Live uses a conservative AudioWorklet microphone monitor, and Harmony mixes up to four independently shifted, leveled and panned voices.
What you get
Shared-playhead Source/Tuned audition, an editable pitch map, optional live monitoring, four-voice Harmony, WAV/MP3 export, before-to-target note and cents data plus a processing receipt with exact output dimensions.

Know before you use it: Backing music, polyphonic material, heavy reverb, growls and unstable fundamentals can confuse any monophonic tracker. Live is an experimental headphone monitor with browser and hardware latency; HQ formant guard compensates a broad spectral envelope but is not physical throat modelling.

Public browser workflow evidence

Question: Can the tool analyse an intentionally off-pitch monophonic fixture, correct it to C major and export a readable WAV?

Observed result: 42 of 45 analysed segments were corrected to C major and the exported 333,272-byte WAV passed the file check.

Evidence boundary: This fixture tests one short synthetic monophonic voice. It is not an accuracy score for every singer, key or recording condition.

Network observation: No audio-payload or cross-origin requests were observed during this published workflow.

Open the public benchmark, method and fixture →

Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details →

FAQ

How do I auto-tune my voice online for free?
Record or load one dry solo voice, choose a key and scale or MIDI targets, choose Modern or Classic correction, then press Tune voice. Auto mode handles fast correction, Graph mode edits individual note regions, Live mode monitors a microphone, and Harmony mode adds up to four voices. Export WAV or MP3 without an account.
Can I edit individual notes and vocal pitch drift?
Yes. After the first analysis, Graph mode lets you select a note region and change its target, pitch center, pitch drift, pitch modulation, timing position, duration feel or bypass state before rendering a new local audition.
Does live autotune work in the browser?
The experimental Live workspace uses an AudioWorklet microphone monitor with current key, scale, MIDI, transpose and vibrato settings. It stays on the device, but latency depends on the browser and audio hardware.
What do confidence, voiced level, strength and smoothing change?
Confidence and minimum voiced level decide which analysis frames are eligible. Strength controls how much of the measured move is requested, smoothing slows abrupt correction changes, and correction range skips a note when its target is too far away. Skipped frames pass through.
Does this online autotune work on a full song, chords or several voices?
Not reliably. The detector expects one dry monophonic voice at a time. A full mix, chords, doubled vocals, overlapping speakers or heavy reverb contain competing pitches and can cause wrong estimates or skipped regions. Isolate the vocal first for a more dependable result.
Does the free online autotune upload my voice, and can it export WAV or MP3?
Selected audio is decoded and processed on your device; the voice file is not uploaded to AudioWrench. You can preview the exact-frame result and export 16-bit WAV or 320 kbps MP3. MP3 export loads the same-origin encoder only when needed.