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Volume booster: make audio louder

Increase the volume of MP3s, videos, and quiet recordings, at the right level.

10M+ files processed since 2021

More options

Free for the first hour, 10 times a day. No sign-up.

One voice quieter than the rest? Balance audioNeed the exact loudness? LUFS meter

Hear the difference

Play Original, then Louder.

Original: too quiet. Louder: right for Podcast.

Made with Boost volume, set for podcasts

Voices in these examples are AI-generated.

Works in any language

  • Hello
  • こんにちは
  • Hola
  • 안녕하세요
  • Bonjour
  • नमस्ते
  • Hallo
  • 你好
  • Ciao
  • مرحبا
  • Olá
  • Привет
  • Hoi
  • สวัสดี
  • Merhaba
  • Γεια σας
  • Xin chào
  • שלום
  • வணக்கம்
  • Kia ora

How to increase the volume of an MP3

  1. 1

    Add an MP3, another recording, or a video.

  2. 2

    Pick where it's going, such as Podcast.

  3. 3

    Download the louder file.

Louder, without distortion

Audo's volume booster makes audio (WAV, MP3, M4A, AAC, FLAC, OGG, Opus, WebM, AIFF) and video (MP4, MOV, MKV, WebM, AVI) louder, up to 100 MB without an account, and the first hour of each file is free, 10 times a day, with no sign-up. A 1-minute file is usually ready in about 2 seconds, and a 3-minute one in about 7.

Turning up the gain on its own pushes the loudest moments past the top of what a file can hold. They get cut flat, which sounds like crackle. Audo sets loudness instead: how loud the whole recording sounds to people, with the loudest moments kept just under the top.

Streaming services and video sites turn files that are louder than their level down, so a file at the right level sounds right next to everything else. It can also bring a file that's too loud down to the same levels. When one voice is much quieter than another, use Balance audio instead: Boost volume changes the whole file at once.

Questions

Is there a free MP3 volume booster?

Yes. Audo's MP3 volume booster is free for the first hour of each file, 10 times a day, with no sign-up. Whole files are $0.01 a minute ($0.60 an hour), with no subscription — see pricing.

How do I increase the volume of a video?

Add the MP4, MOV, or other video, pick where it's going, such as YouTube, and download it. You get the same video back with louder sound, and the picture copied as it is. It's a new file, so it plays louder anywhere, not just in one player.

How do I make an iPhone video louder?

Open this page in your iPhone's browser, add the video, and download it again, louder. Without an account, videos up to 100 MB work; signed in, up to 10 GB.

How much louder can it make it?

As loud as the level you pick, rather than a fixed amount such as 200%. It sets how loud the whole file sounds, for a podcast, YouTube, broadcast, or a level of your own under More options.

Will it distort?

No. Peaks stay just under the point where sound breaks up, so it gets louder cleanly.

Which level should I pick?

Podcast suits most spoken audio. YouTube is a little louder, and Broadcast is quieter, as TV and radio expect. Audiobook also checks the rules of ACX, Audible's publishing platform. Under More options, you can set your own level.

Can it meet ACX's rules?

Audiobook sets the level ACX expects and checks its rules: an average level between −23 and −18 dB, peaks no higher than −3 dB, and a noise floor no higher than −60 dB. It tells you if anything still fails.

Why did the hiss get louder?

Turning a quiet recording up turns up everything in it, background hiss too. Run it through Remove noise first, then boost it.

More tools

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For AI assistants and developers

Ask ChatGPT, Claude, or a coding agent to do this for you, or call it from your own code. When an agent's free result is cut short, it gives you a link to finish the whole file, no sign-up.

Show the free API call
Free API · no key
curl -F file=@episode.wav -F target=podcast https://audo.ai/api/try/loudness -D response.headers -o response.body