Muffle audio.
In bulk.
Apply a low-pass filter to make audio sound distant, underwater, or through-the-wall. Process up to 5 files at once with real FFmpeg filters.
Why muffle
your audio?
An audio muffler applies a low-pass filter that strips away higher frequencies, simulating how sound travels through walls, water, or distance. It is widely used in video production, game sound design, and privacy redaction.
Every file is processed server-side with FFmpeg and deleted immediately. Nothing is stored, indexed, or shared.
How muffled
do you need it?
Light to Medium
A subtle low-pass around 800–2,000 Hz gently rolls off the brightest frequencies. Ideal for simulating a conversation in the next room, softening harsh recordings, or adding warmth to digital audio without losing clarity.
Heavy to Extreme
Cutting off at 200–400 Hz leaves only the low end — the thud of footsteps, the rumble of a distant engine, or the muffled cadence of speech with no intelligible words. Perfect for privacy masking and deep sound design.
Drop
Drag in up to 5 audio files — MP3, OGG, WAV, FLAC, or M4A.
Muffle
Choose your intensity and output format. The server applies a true low-pass filter.
Keep
Download the finished files — individually or as a single ZIP.
Looking for another audio utility?
Convert MP3 to OGG