Audio Voice Effects
Apply pitch, robot, phone, echo, and other effects to audio.
Apply voice effects to audio in your browser — pitch up, pitch down, helium chipmunk, deep voice, robot, phone call, echo, reverb, slow, fast, reverse. Eleven presets covering most common transformations. All in-browser via FFmpeg.wasm — no upload, no signup.
How it works
3-step walkthrough
How it works
3-step walkthrough
- 1
Drop the audio
MP3, WAV, FLAC, AAC, OGG, M4A. Both speech and music work; effects shine on speech.
- 2
Pick an effect
Eleven presets covering the most common voice transformations. Pitch effects (up, down, helium, deep) keep duration stable; speed effects (slow, fast) change duration; spatial effects (echo, reverb) add ambience; character effects (robot, phone) reshape the sound.
- 3
Apply and preview
The transformation runs in your browser. After processing, the output appears with a built-in audio player so you can preview before downloading.
Why use Dropvert
Local-first, free, no upload required
Why use Dropvert
Local-first, free, no upload required
- Eleven presets cover most use cases — no need to learn FFmpeg filter syntax.
- Browser-side. Works on private recordings without upload.
- Inline audio preview before download — no need to download to test the effect.
- Output is MP3 at 192 kbps for easy sharing; lossless variants of the source format on request.
Frequently asked questions
5 answered
Frequently asked questions
5 answered
- Can I combine multiple effects?
- Not in v1 — the tool applies one effect at a time. To stack effects, run the tool, save, drop the result back in, apply the next effect. Each round is a slight quality loss because of MP3 re-encoding; for stack-heavy work, use a desktop DAW.
- How does pitch shift preserve duration?
- The "pitch up" / "pitch down" presets use FFmpeg's asetrate + atempo trick: speed up the playback (raises pitch and shortens duration), then slow back down to the original duration without changing pitch. Quality is comparable to professional pitch shifters at modest amounts (±2–4 semitones); larger shifts produce artifacts.
- Will my voice still sound like me?
- Pitch / robot / phone effects fundamentally change the sound. The "deep voice" / "pitch down" effects produce something recognizable as "you slowed down"; the helium / robot / phone effects are deliberately unrecognizable. Voice cloning (sound like a specific other person) is a different category — not in this tool, and not feasible in-browser yet.
- How long does processing take?
- Most effects are real-time or near-realtime — a 1-min audio clip takes ~10–20 s. Reverse and reverb are slower (full pass through the audio buffer); allow ~30–60 s.
- Is my audio uploaded?
- No. All effects run via FFmpeg.wasm in your browser.
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