Vocal harmony generator — add harmony voices to your vocals

A free browser-based tool that turns one vocal recording into full, natural-sounding harmonies — a vocal harmonizer, harmony maker and voice doubler in one. It analyzes your melody, picks musically correct thirds, fifths and octaves in your key, and stacks them so they sound like real backing singers rather than a robotic effect. All processing runs in your browser via Web Audio and WebAssembly.

How to add harmony to a vocal

1
Upload your vocal

Add a dry solo-vocal recording (MP3, WAV, FLAC, M4A and more). A clean a cappella take works best.

2
Pick a harmony preset

Choose duet, trio, gospel, octaves or choir. The key and scale are detected automatically — adjust them if you like.

3
Preview and fine-tune

Press Create, then A/B the result against the original and tweak humanize, harmony level or individual voices.

4
Download the result

Save the full mix as MP3 or WAV, or grab each harmony voice as a separate stem.

Create rich backing harmonies from a single vocal take

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Why this harmony generator

In-key harmonies, not chipmunks
Diatonic thirds, fifths, sixths and octaves follow your chosen key so every harmony note lands in the scale — with formants preserved so the voices stay human.
Your own voice, multiplied
Harmonies are built from your actual recording, keeping your timbre and phrasing — not swapped for a synthetic AI singer.
Natural, humanized stacking
Per-voice detune, micro-timing and stereo spread decorrelate the voices so the result sounds lush and wide, never hollow or phasey.
Presets for every style
One click for duet, trio, gospel, octaves or a full choir — then fine-tune each voice's level, pan and mute.
Mix and stems export
Download the finished harmony as MP3 or WAV, or export each harmony voice as a separate stem for your DAW.
Runs in the browser
No installation and no plugins — the whole engine runs locally via WebAssembly and works offline once loaded.

Frequently asked questions

What kind of file should I upload?

A dry, solo vocal — a single voice singing with little background music or reverb. If you upload a full song mix the harmonies will be less accurate, so isolate the vocal with a vocal remover first.

Does it turn my voice into someone else's?

No. The harmonies are pitch-shifted copies of your own recording with formant preservation, so they keep your timbre and character. It is a classic harmonizer, not an AI voice swap.

What are diatonic (in-key) harmonies?

Harmonies that stay in your song's key. A "third above" becomes a major or minor third depending on the note, so every harmony voice sounds musically correct instead of a fixed interval that can clash.

Can I download the individual harmony voices?

Yes. Each harmony voice can be exported as its own stem in MP3 or WAV, so you can balance them separately in your DAW.

Is it free?

Yes. There is a generous daily limit on renders for non-Premium users, and a Premium account raises it substantially.

Will it work on my phone?

Yes. It runs in the browser on modern phones and laptops. Very long clips may be limited by device memory, so shorter takes render fastest.

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Who is this tool for?
🎵 Musicians & Producers 🎛️ Sound Engineers ✨ Content Creators
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