Online Vocal Harmonizer
Turn one vocal into a controlled three-part stack. Choose every interval, level and stereo position, audition exactly what changed, and export the complete timeline without uploading your audio.
VOICE DETAIL MAP
Harmony Voice Stack
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.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
- Lead vocal
Start with the right material
Drafting thirds, fifths, octaves, lower doubles and stereo harmony stacks from a clean monophonic vocal or instrument line.
- Generate interval voices
Understand the transformation
Each enabled lane applies a bounded deterministic pitch shift at its selected semitone interval, then gain and pan place the voice around the dry source before final output control.
- Layered harmonies
Verify the usable result
Original, harmonized and Difference monitoring plus exact-duration WAV or MP3 export from a preset or custom three-lane stack.
Where this workflow stops
This does not detect a song key, correct wrong notes, preserve formants or understand harmony. Large intervals and polyphonic, reverberant or noisy input can sound granular or unnatural.
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.
- Harmony engine
- Three deterministic granular overlap-add pitch voices with independent enable, semitone interval, gain and pan.
- Monitoring
- Synchronized Original, Processed and Difference views use the same decoded timeline for honest comparison.
- Output
- Stereo at the original decoded sample rate, frame count and duration; local 16-bit WAV or MP3 export.
How to add vocal harmonies online
- Choose a browser-supported vocal recording or generate the deterministic vocal-style demo.
- Start with Thirds, Fifth Stack, Octave Choir or Dark Below, then edit each voice independently.
- Process on this device and compare Original, Processed and Difference without losing the playhead position.
- Download the complete Processed mix as WAV or locally encoded MP3.
A practical three-voice harmony rack
Each lane is a separate pitch-shifted copy. Interval selects a musical distance in semitones, level controls how strongly that singer enters the stack, and pan places it across the stereo field. Disable a lane to hear a smaller duet, or set Custom for any whole-semitone interval from −24 to +24.
The fixed intervals do not follow a scale automatically. A major third (+4) and minor third (+3) can both be useful, but the correct one depends on the note and chord under it. This tool gives you explicit control rather than pretending to understand the harmony.
What the processor does — and does not do
- The bounded overlap-add renderer targets the original duration and writes the exact decoded input frame count.
- It does not preserve vocal formants. Octaves and other large shifts can sound smaller, larger, grainy or phasey.
- It does not detect the key, tune wrong notes, generate new lyrics, separate a vocal from a mix or imitate another singer.
- Stereo source audio keeps its dry stereo image; harmony voices are made from a mono sum so each lane can occupy a clear pan position.
- Files above 80 MB, longer than 15 minutes or over the screen-specific local memory budget are refused before rendering.
Privacy: selected audio is decoded, processed and encoded in this browser. It is not sent to AudioWrench. Normal page assets can still be requested when the page loads.
Vocal Harmonizer: quick answer and technical limits
Quick answer: A local three-voice harmonizer that renders independently pitched, leveled and panned copies around one source while keeping the decoded timeline length.
- Best for
- Drafting thirds, fifths, octaves, lower doubles and stereo harmony stacks from a clean monophonic vocal or instrument line.
- How it works
- Each enabled lane applies a bounded deterministic pitch shift at its selected semitone interval, then gain and pan place the voice around the dry source before final output control.
- What you get
- Original, harmonized and Difference monitoring plus exact-duration WAV or MP3 export from a preset or custom three-lane stack.
Know before you use it: This does not detect a song key, correct wrong notes, preserve formants or understand harmony. Large intervals and polyphonic, reverberant or noisy input can sound granular or unnatural.
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 →