Gas Mask Voice Changer: Free Online, No Sign Up

More versions

Variation: Whisper 40%: more breath through the filter.
Variation: Pitch -4 with more distortion: a powered respirator.

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

Rubber, filter and breath

Part	Setting	What you hear
Mask shell	Midrange +6 dB around 800 Hz	A boxy, cupped resonance right at the mouth
Filter	Treble cut above 2.2 kHz	Dull consonants, as if speaking through cloth
Breath	Whisper 15%	Air mixed into every word
Build	Pitch -1, Tone -1	A slightly heavier speaker
Hollow	Flanger 0.1 times a second, 30% mix	A faint tube-like colour from the canister

Breathing is your job

The noise gate mutes quiet sounds between words, so soft breathing is cut. Breathe in loudly through your mouth before a line, loud enough to open the gate, and the effect turns it into a filter hiss.
Speak in short sentences with a breath between each, as if air is rationed.
Keep your jaw fairly closed and talk from the chest. A tight mouth matches the 800 Hz box and stops the voice sounding too clear.
Stay a hand's width from the mic so the loud breaths don't thump.

Gas mask, masked horror or muffled?

The masked horror voice is a character: deeper, built to frighten. The muffled effect is a wall, with nearly all the words removed. The gas mask sits between them. It is a real person in equipment, fully understandable, at almost their own pitch. That suits survivors, soldiers, hazmat crews and post-apocalyptic roleplay. For more air, the Whisper 40% clip pushes more breath through the filter. For a heavier unit, the Pitch -4 clip, with Tone -2 and distortion at 0.35, sounds like a powered respirator with a speaker on the front.

The exact settings

Setting	Value
Noise gate	mutes the mic below -50 dB, between words
Pitch	-1 (lower)
Tone	-1 (sounds bigger)
Whisper	15%
Distortion	drive 0.15, 30% mix
Flanger	wobbles 0.1 times a second, 30% mix
Bass cut	below 200 Hz
Treble cut	above 2.2 kHz
Midrange	+6 dB around 800 Hz
Compressor	steadier volume (6:1 from -28 dB, then +5 dB)

Free Gas mask voice changer FAQ

Does it add the breathing sound by itself?

No. It colours whatever reaches the mic, so the in-and-out breathing has to come from you. Breathe audibly between lines and it comes out as mask hiss.

Can I use it while wearing a real mask for cosplay?

It runs in Chrome on a computer, so it suits recorded videos and streams more than a convention floor. Record your lines in the Online Voice Changer and play them back if you need them on the move.