Space Marine Voice Changer: Free Online, No Sign Up

More versions

Variation: Band narrowed to 350–3200 Hz: through the helmet's speaker grille.
Variation: Pitch -12 and a 2-second reverb: a walking war machine.

Use it in calls and on recordings

Try it here
Press Start mic above and talk. You hear this voice with the exact settings on this page, and every slider can be moved.
Use it live
Press Use this voice in calls, then pick Facecam Virtual Mic as the microphone in Discord, Google Meet, Zoom or any other call that runs in Chrome.
Put it on a recording
Open Online Voice Changer, record or upload a file, choose the same settings and download the result.

More about this voice

Size first, then the vox

Part	Setting	What you hear
Giant	Pitch -8, Tone -5	A voice from a body far larger than a man's
Vox	Distortion 0.3, 50% mix	A loudspeaker driven hard
Armor	Flanger 0.1 times a second, 35% mix	A slow metallic shimmer, like sound inside plate
Boom	Bass +5 dB below 150 Hz	Each stressed word lands like a footstep
Grille	Treble cut above 4.5 kHz	Dull and heavy, no hiss

Proclaim

Speak as if to a battlefield: loud, slow, every sentence a declaration. Oaths, battle orders and litanies are the right material.
Stress the first word of each sentence and hold the final one.
Breathe in before the line, not during it. At Pitch -8 a mid-sentence breath becomes a rumble.
Stand a forearm's length from the mic so a loud delivery doesn't clip before the effect gets it.

Space Marine, Master Chief or giant?

Master Chief is a man in a helmet: four steps down, quiet, clean. The Space Marine is twice that drop with distortion and a bass lift, so he's bigger and louder than any person. The giant voice is about size alone, without the speaker. Of the two variations, the first narrows the band to 350–3200 Hz, which puts the voice behind the helmet's speaker grille and suits tabletop sessions where character matters more than fidelity. The other, Pitch -12 with a 2-second reverb at 25%, is a walking war machine; keep that for single lines.

The exact settings

Setting	Value
Noise gate	mutes the mic below -55 dB, between words
Pitch	-8 (lower)
Tone	-5 (sounds bigger)
Distortion	drive 0.3, 50% mix
Flanger	wobbles 0.1 times a second, 35% mix
Treble cut	above 4.5 kHz
Bass	+5 dB below 150 Hz
Midrange	+3 dB around 1 kHz
Reverb	15% mix, 0.8 s long
Compressor	steadier volume (4:1 from -24 dB, then +4 dB)