---
title: Normalize Audio Loudness API
slug: normalize-audio-loudness-api
url: https://apyhub.com/freedailypro/service/normalize-audio-loudness-api
provider: FreeDailyPro
tags: [audio, normalize audio, loudness normalization, volume leveling, audio loudness, audio editing, audio processing]
auth: api_key
version: 1.0.0
service_type: sync
endpoints: 1
atoms: 10
mcp: true
---

# Normalize Audio Loudness API

Normalize the loudness of an audio file with one API call. Upload up to 30 MB and get the evened-out audio back as a binary file.

## Endpoints

| Method | URL | Description | Atoms |
| --- | --- | --- | --- |
| POST | `https://api.eu.apyhub.com/freedailypro/normalize-audio-loudness-api/audio-normalize` | What it does Normalizes the loudness of an uploaded audio file and returns the processed audio as a… | 10 |

## Endpoint reference

### Normalize audio loudness

`POST https://api.eu.apyhub.com/freedailypro/normalize-audio-loudness-api/audio-normalize` · 10 atoms · accepts `multipart/form-data` · returns `application/json`

| Parameter | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `file` | body | string (binary) | yes | The audio file. Up to 30 MB. |

#### Quickstart

Upload one audio file to normalize it.

```bash
curl -X POST "https://api.eu.apyhub.com/freedailypro/normalize-audio-loudness-api/audio-normalize" \
  -H "apy-token: $APY_TOKEN" \
  -F "file=@/path/to/audio.mp3"
```

#### What you'll get back

Returns a binary file (`string` with `format: binary`) containing the normalized audio.

## About

## What it does
Audio Loudness Normalizer takes one audio file and returns the same file with normalized loudness. Send a binary audio upload in the `file` field, and get a binary audio file back.

Use it when you need consistent playback levels across a library of clips, podcasts, voice notes, or user-generated uploads. Normalizing loudness helps reduce abrupt volume jumps between tracks and makes content easier to review, publish, or batch process.

The request schema is intentionally simple: a single `file` upload, up to 30 MB. The response is the normalized audio file itself, so you can pass it directly into storage, playback, or the next step in your pipeline without parsing a JSON wrapper.

If your workflow handles mixed audio content, this endpoint gives you a direct normalization step that fits cleanly between ingestion and distribution.

## Usage

Base URL: `https://api.eu.apyhub.com` (default region — see
`GET https://apyhub.com/api/public/regions` for the rest).

Authenticate with an ApyHub API key in the `apy-token` header.
Full docs and a live playground: https://apyhub.com/freedailypro/service/normalize-audio-loudness-api