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Audio Low-Pass Filter

Apply a low-pass filter to remove high frequencies

Rolls off high frequencies above the cutoff to soften brightness or remove hiss.

Click to upload file or drag and drop file here

Maximum file size: 200MB Supported formats: audio/*

Key Facts

Category
Media
Input Types
file, number, select
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Audio Low-Pass Filter tool applies a low-pass filter to audio files, attenuating frequencies above a specified cutoff to reduce high-frequency noise or soften the sound for a warmer tone.

When to Use

  • •When you need to remove high-frequency hiss or noise from audio recordings.
  • •When you want to make audio sound less bright and more balanced.
  • •When preparing audio for playback on systems with limited high-frequency response.

How It Works

  • •Upload your audio file in a supported format like MP3, WAV, or FLAC.
  • •Set the cutoff frequency in Hz to define where the filter begins attenuating highs.
  • •Adjust the filter order to control the steepness of the frequency roll-off.
  • •Select the output format and process the file to download the filtered audio.

Use Cases

Cleaning up podcast audio by reducing background hiss or microphone noise.
Softening harsh vocal recordings in music production for a warmer mix.
Adapting audio files for telephone systems or devices with limited frequency range.

Examples

1. Removing Hiss from a Podcast Recording

Podcaster
Background
A podcaster has an interview recording with noticeable high-frequency hiss from the microphone.
Problem
The hiss makes the audio sound unprofessional and distracting to listeners.
How to Use
Upload the audio file, set the cutoff frequency to 7000 Hz to target the hiss, and choose a moderate order for a smooth roll-off.
Example Config
cutoffHz: 7000, order: 2, outputFormat: mp3
Outcome
The hiss is significantly reduced, resulting in cleaner, more professional-sounding audio.

2. Warm Up Vocals in a Song Mix

Music Producer
Background
A music producer finds that the lead vocals in a track are too bright and harsh against the instrumental backing.
Problem
The harshness clashes with the warm tones of the instruments, affecting the overall mix balance.
How to Use
Apply the low-pass filter with a cutoff around 10000 Hz to gently roll off the highs without losing clarity.
Example Config
cutoffHz: 10000, order: 1, outputFormat: wav
Outcome
The vocals become warmer and blend seamlessly with the mix, enhancing the listening experience.

3. Prepare Audio for Telephone System

Audio Engineer
Background
An audio engineer needs to convert a high-quality audio file for use in a telephone system that only supports frequencies up to 3400 Hz.
Problem
The original audio contains frequencies beyond the system's range, which could cause distortion or poor call quality.
How to Use
Set the cutoff frequency to 3400 Hz and use a high order to ensure a sharp cut-off, then export in a compatible format.
Example Config
cutoffHz: 3400, order: 5, outputFormat: wav
Outcome
The audio is filtered to match the telephone system's frequency response, ensuring clear and distortion-free playback.

Try with Samples

audio, video, file
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
title token audio
audio
Copyright-Free MP3 Audio Samples
Collection of royalty-free audio samples for testing and development purposes including nature sounds, meditation music, and ambient audio
title token audio
audio
Copyright-Free WAV Audio Samples
Uncompressed PCM WAV audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token audio
audio
Copyright-Free OGG Vorbis Audio Samples
Open-source OGG Vorbis audio samples for testing and development, featuring excellent compression with nature sounds and meditation music
title token audio
audio

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FAQ

What audio file formats can I upload?

You can upload any audio file, as the tool supports audio/* formats.

What is the default cutoff frequency?

The default cutoff frequency is 8000 Hz.

How does the filter order affect the audio?

The order determines the steepness of the frequency roll-off; higher orders provide a sharper cut.

What output formats are available?

Output formats include MP3, AAC, M4A, OGG Vorbis, Opus, FLAC, and WAV.

Is there a limit on file size?

Yes, the maximum file size is 200 MB.

API Documentation

Request Endpoint

POST /en/api/tools/audio-low-pass-filter

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes -
cutoffHz number No -
order number No -
outputFormat select No -

File type parameters need to be uploaded first via POST /upload/audio-low-pass-filter to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-audio-low-pass-filter": {
      "name": "audio-low-pass-filter",
      "description": "Apply a low-pass filter to remove high frequencies",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-low-pass-filter",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]