Free MP4 Audio Mastering Tool

Make Your MP4 Audio Loud, Clean & Phone-Friendly

Upload your MP4, choose a loudness preset, and download a new optimized version with LUFS targeting, smart compression detection, and true-peak protection.

⬆

Drag your MP4 here

or click to browse

No file selected
✓ MP4 Files Only ✓ Video Quality Unchanged ✓ Auto-Deleted After 24 Hours ✓ No Account Required

Share LUFS Optimizer

Know a creator, DJ, podcaster, or video editor who needs louder, cleaner MP4 audio? Share this free tool.

How LUFS Optimizer Works

1. Upload MP4

Select your finished video file.

2. Choose Preset

Pick the loudness target that fits your platform.

3. Optimize Audio

Improve loudness with true-peak protection.

4. Download

Save your optimized MP4 and test it before upload.

Who Uses LUFS Optimizer?

YouTube Creators

Improve playback consistency and avoid videos that sound quieter than competing content.

TikTok Creators

Make short-form videos louder and more phone-friendly without harsh clipping.

DJs

Improve the loudness consistency of recorded DJ mixes and performance videos.

Podcasters

Create podcast video clips with stronger loudness and better listener experience.

Video Editors

Prepare client videos with cleaner, more consistent audio levels.

Businesses

Create promotional and marketing videos with more reliable playback across devices.

Clean Loudness

Targets social-friendly LUFS levels without making the audio sound slammed.

True-Peak Safety

Helps prevent clipping after social platforms process your upload.

Smart Detection

If audio already looks compressed, the tool avoids extra squeezing.

Free Online MP4 LUFS Optimizer

LUFS Optimizer helps creators, DJs, podcasters, and video editors make MP4 audio louder and more consistent for YouTube, TikTok, Instagram, and Facebook.

Why does video audio sound quiet on phones?

Many MP4 videos are exported with audio that is too quiet, inconsistent, or not optimized for mobile speakers. LUFS normalization helps your video reach a more reliable loudness level while true-peak protection helps avoid distortion.

What Is LUFS?

LUFS stands for Loudness Units Relative to Full Scale. It is a loudness measurement used to evaluate perceived audio volume over time. Unlike peak volume meters, LUFS better reflects how loud audio actually sounds to listeners.

Understanding LUFS helps creators produce audio that sounds more consistent across YouTube, TikTok, Instagram, podcasts, DJ mixes, and other video platforms.

Read the full LUFS guide →

Best LUFS For YouTube

YouTube uses loudness normalization to help create a more consistent listening experience. Videos that are excessively loud may be turned down automatically, while quieter videos can sound weak compared with competing content.

Many creators aim for approximately -14 LUFS while maintaining proper true peak protection.

Read the YouTube guide →

Best LUFS For TikTok

TikTok is primarily consumed on phones and earbuds. Audio clarity and perceived loudness play a major role in viewer engagement. Proper loudness targeting helps content sound stronger without creating distortion.

Read the TikTok guide →

Why MP4 Audio Sounds Quiet

Many exported MP4 files contain audio that technically peaks near the limit but still feels quiet in real-world listening situations. This often happens when average loudness remains too low even though peak levels appear high.

LUFS normalization helps solve this problem by focusing on perceived loudness rather than simple peak measurements.

Learn more →

How LUFS Optimizer Works

LUFS Optimizer analyzes MP4 audio, applies loudness optimization based on the selected preset, protects true peak levels, and creates a new optimized MP4 file while preserving video quality.

The tool is designed for creators who want faster audio improvement without opening complex audio engineering software.

See how it works →

Popular Creator Guides

What Is True Peak Audio?Understand true peak headroom and clipping protection. How Loud Should YouTube Shorts Be?Short-form YouTube audio tips for mobile playback. Best Audio Settings for Instagram ReelsRecommended Reels audio workflow and settings. Why Video Sounds Different After UploadLearn why uploads can change after platform processing. How to Fix Quiet Voice RecordingsMake speech clearer and more consistent in MP4 videos.

Upload Requirements

Popular Audio Guides

What Is LUFS? Best LUFS For YouTube Best LUFS For TikTok MP4 Loudness Guide Audio Loudness Guides