Record yourself or upload a vocal, choose the song's key and scale, and the tool pulls every sung note to the nearest correct pitch. A slow retune speed gives subtle, natural correction; 0 ms gives the hard, robotic T-Pain effect. Compare before and after on the pitch graph, then download WAV or MP3. Everything runs in your browser.
Last updated:
Robotic (0 ms)Natural (200 ms)
OffKeep sustained notes loose
0:00.0
Original pitch Tuned pitch Notes in the scale
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How to use the Auto-Tune Voice Online
Load a vocal: record your voice, drop a file, or keep the demo voice that loads with the page. A dry, solo vocal (no backing music, no reverb) works best.
Set the key and scale of the song. If you don't know the key, use Chromatic: every note is corrected to the nearest semitone.
Choose a retune speed or a preset. 0 ms snaps instantly for the robotic effect; 40 ms is a typical pop sound; 90 ms and above sounds natural.
Press play and switch between Tuned and Original. On the graph, grey is what you sang and green is the corrected pitch.
Download WAV or MP3 and place the tuned vocal back into your song.
Retune speed and humanize settings
Sound you want
Retune speed
Humanize
Notes
Robotic / T-Pain effect
0 ms
0 %
Instant jumps between notes; exaggerated on slides and runs
Hard modern pop and trap
10 to 25 ms
0 to 15 %
Clearly tuned but still sung
Typical pop vocal
30 to 50 ms
15 to 30 %
Tight pitch with a natural feel
Transparent correction
80 to 120 ms
40 to 60 %
Fixes held notes, keeps scoops and vibrato
Gentle touch-up
150 to 200 ms
60 % or more
Only long, clearly off notes move noticeably
Scales and the notes they allow
The key and scale decide which notes your voice can be pulled to. With fewer allowed notes, each sung pitch moves to the nearest allowed one, so a wrong scale can pull a correct note to the wrong place. Examples in C:
Scale
Notes in C
Good for
Chromatic
All 12 notes
Unknown key, songs with many accidentals
Major
C D E F G A B
Most pop, rock, country and folk songs
Natural minor
C D E♭ F G A♭ B♭
Minor-key songs
Harmonic minor
C D E♭ F G A♭ B
Minor songs with a raised 7th (classical, metal, some pop)
Major pentatonic
C D E G A
Simple melodies, strong effect with few notes
Minor pentatonic
C E♭ F G B♭
Hip-hop and R&B hooks, rock
Blues
C E♭ F G♭ G B♭
Blues and soul phrases
Tips for a better auto-tuned vocal
Record dry and close to the microphone. Add reverb and other effects after tuning, not before.
Tune each vocal track (lead, harmonies, ad-libs) separately; chords or doubled voices can't be tuned together.
Correction moves notes to the nearest allowed pitch. If you sing more than half a step off, the tool may pick the neighbouring note; sing closer, or use a scale with fewer notes.
Pitch shifts of a semitone or two keep the voice natural. To transpose a whole vocal by several semitones, use a pitch changer instead.
Frequently asked questions
How does this auto-tune work?
First the pitch of your voice is measured every 5 ms with the YIN algorithm. Each sung pitch is compared with the nearest note of the chosen key and scale, and the difference becomes a correction curve. The vocal is then resynthesized with TD-PSOLA: short, pitch-synchronous slices of the waveform are overlapped closer together to raise the pitch or further apart to lower it, which keeps the timing and most of the voice's character.
How do I get the T-Pain or robotic auto-tune effect?
Set Retune speed to 0 ms and Humanize to 0 % (the Robotic preset). The pitch then jumps instantly from note to note with no glide, which creates the stepped, synthetic sound. It is strongest when you sing slides and runs between notes, and when the key and scale match the song.
What does retune speed mean?
Retune speed is how quickly the pitch is pulled to the target note, expressed here as a time constant in milliseconds. Short times correct almost instantly and remove vibrato and scoops; long times let natural movement through and only fix notes you hold. Most pop vocals use roughly 20 to 50 ms, transparent correction 80 ms or more.
What does Humanize do?
Humanize slows the correction on sustained notes only. Short notes are still tuned at the retune speed, but once a note is held longer than about a quarter of a second, the correction relaxes so natural vibrato and small drifts survive, which avoids the flat, synthetic sound on long notes.
Which key and scale should I choose?
Use the key the song is in, which you can find with the Song Key Finder or from the chord chart. If the song uses notes outside the scale, or you're unsure, choose Chromatic: every note snaps to the nearest semitone, which is safe but cannot fix notes that are more than half a semitone off.
Why does my result sound strange or warbly?
Pitch correction needs a clean, single voice. Backing music, harmonies, heavy reverb or loud background noise confuse the pitch detection, and breathy or whispered parts have no clear pitch. Record dry in a quiet room, choose the voice range that matches the singer, and use a slower retune speed if the voice sounds warbly.
Is my recording uploaded?
No. Recording, pitch detection, correction and file encoding all happen on your device in the browser. Nothing is sent to a server.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.