Batch Audio Normalize

Normalize multiple audio files to a target peak level with consistent volume across the batch

Click to upload files or drag and drop files here

Maximum file size: 200MB Maximum files: 10
Supported formats: audio/*

Target peak level in dB (typically -0.1 to -3.0)

Key Facts

Category
Images, Audio & Video
Input Types
file, number, select, checkbox
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Batch Audio Normalize tool allows you to upload up to 10 audio files simultaneously and normalize their volume to a consistent target peak level. By adjusting peak levels, you can eliminate sudden volume jumps across different tracks and export them in formats like MP3, WAV, FLAC, or AAC while preserving original file names.

When to Use

  • •When preparing a playlist or podcast episode compilation where tracks have varying volume levels.
  • •When mastering multiple audio stems or voiceover recordings to ensure they all peak at a safe, consistent level like -1.0 dB.
  • •When converting and leveling a batch of raw audio recordings into a unified output format like MP3 or WAV for distribution.

How It Works

  • •Upload up to 10 audio files in formats such as MP3, WAV, FLAC, or M4A.
  • •Set your desired Target Peak Level in decibels (dB), typically between -0.1 dB and -3.0 dB to prevent clipping.
  • •Choose your preferred output format and decide whether to keep the original file names.
  • •Process the files to analyze the peak amplitude of each track and apply the precise gain adjustment needed to reach the target level.

Use Cases

Standardizing voiceover tracks recorded across different sessions to a uniform -1.0 dB peak level.
Preparing background music tracks for a video project to ensure none of the tracks clip or sound excessively quiet.
Batch converting and leveling raw field recordings into web-ready MP3 files with consistent peak volumes.

Examples

1. Standardizing Podcast Voice Tracks

Podcast Producer
Background
A producer has recorded interviews with three remote guests using different microphones, resulting in highly inconsistent volume peaks across the individual audio tracks.
Problem
The tracks peak at different levels (some at -6 dB, others at -0.5 dB), making the final mix sound uneven and unprofessional.
How to Use
Upload the three guest audio files, set the Target Peak Level to -1.0 dB, select WAV as the output format, and keep the original file names.
Example Config
Target Peak Level: -1.0 dB, Output Format: WAV, Keep Original Names: True
Outcome
All three tracks are normalized to peak exactly at -1.0 dB, providing a balanced starting point for mixing without any clipping.

2. Preparing Music Stems for a Video Game

Sound Designer
Background
A sound designer needs to export 8 ambient loops for a game engine, but the exported stems have varying peak levels.
Problem
The game engine requires all ambient loops to peak at exactly -2.0 dB to prevent runtime clipping when mixed with sound effects.
How to Use
Upload the 8 ambient audio files, set the Target Peak Level to -2.0 dB, choose OGG Vorbis as the output format, and run the batch process.
Example Config
Target Peak Level: -2.0 dB, Output Format: OGG, Keep Original Names: True
Outcome
All 8 loops are normalized to a peak level of -2.0 dB and exported in OGG format, ready for direct integration into the game engine.

Try with Samples

audio, 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 FLAC Audio Samples
Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token audio
audio
Copyright-Free M4A Audio Samples
Apple iTunes compatible M4A audio samples with AAC encoding, optimized for quality and file size balance
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

Related Hubs

Audio Encoding and Format Conversion Tools
Compare audio format conversion, bitrate changes, sample-rate conversion, codec swaps, and export tools in one hub for delivery and archive workflows.
Audio Editing and Cleanup Tools
Compare audio trimming, silence removal, fades, mixing, and denoise tools in one hub for podcast, voiceover, and music cleanup workflows.
Audio Preview, Tone, and Effect Generator Tools
Compare audio preview generation, silence creation, ringtone building, fingerprinting, loudness reports, and effect-style audio generators in one hub.
Audio Measurement and Inspection Tools
Compare loudness, dynamic range, peak, BPM, key detection, spectral inspection, and metadata review tools in one hub for audio analysis.

FAQ

What is peak normalization?

Peak normalization adjusts the gain of an entire audio file so that the highest peak reaches a specified target level, ensuring consistent maximum volume without altering the dynamic range.

What target peak level should I use?

A target peak level between -0.1 dB and -1.0 dB is standard for general audio distribution, while -2.0 dB or -3.0 dB is often preferred to prevent distortion during lossy compression.

How many audio files can I normalize at once?

You can upload and process up to 10 audio files in a single batch.

Will this tool compress the dynamic range of my audio?

No, peak normalization applies a uniform gain adjustment to the entire file, preserving the original dynamics and relative volume differences within each track.

What output formats are supported?

You can export your normalized audio files in MP3, WAV, FLAC, AAC, M4A, OGG, or Opus formats.

API Documentation

Request Endpoint

POST /en/api/tools/audio-batch-normalize

Request Parameters

Parameter Name Type Required Description
audioFiles file (Upload required) Yes -
targetDb number No Target peak level in dB (typically -0.1 to -3.0)
outputFormat select No -
keepOriginalNames checkbox No -

File type parameters need to be uploaded first via POST /upload/audio-batch-normalize 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-batch-normalize": {
      "name": "audio-batch-normalize",
      "description": "Normalize multiple audio files to a target peak level with consistent volume across the batch",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=audio-batch-normalize",
      "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]