Is Normalize audio free? Is there a watermark?

Yes — Normalize audio is free to use with no sign-up or watermark. Very large files can still be limited by your browser's available memory and processing resources.

Do my files get uploaded to a server?

No. Normalize audio runs entirely in your browser with WebAssembly, so your MP4, MOV, WebM (with audio) file never leaves your device and nothing is stored or seen by us.

What can I put in, and what do I get out?

Normalize audio accepts MP4, MOV, WebM (with audio) and gives you back a MP4 file. Actual codec support depends on what the bundled engine or browser decoder can read.

Does Normalize audio change my original file?

No. It never touches your original — Normalize audio creates a brand-new MP4 file to download and leaves the source on your device untouched.

Free tools · Edit

Normalize audio

Apply FFmpeg's single-pass loudness normalization to the video's overall audio, then encode it as AAC. It does not mix sections independently. Runs in your browser.

Runs entirely in your browser. Your file is never uploaded — no watermark, no account.

Drop a file or click to chooseMP4, MOV, WebM (with audio)

Get a better result

Best for: Bringing a video programme toward more consistent overall loudness and peaks before delivery, especially when one fixed gain change is insufficient.
Input → output: The video stream is copied while audio passes through FFmpeg loudnorm and becomes 128 kbps AAC in an MP4 container.
Quality tip: Compare dialogue, music, and peaks afterward at a representative listening level. Retain the source because loudness preference depends on destination.
Know before running: This single-pass operation is not per-scene mixing, denoising, compression, mastering, or proof of a measured broadcast deliverable. Silent sources cannot be processed.
Next step: Adjust volume only when a deliberate final gain change is still needed.

How to use Normalize audio

1
Choose your file. Drop a supported MP4, MOV, WebM (with audio) file into the tool, or click to select one. It stays on your device — nothing is uploaded.
2
Run locally. Press Run to begin. The first processing run loads the browser engine before local processing begins.
3
Download. Review the result, then download the finished file from your browser with no watermark.

Frequently asked questions

Is Normalize audio free? Is there a watermark?: Yes — Normalize audio is free to use with no sign-up or watermark. Very large files can still be limited by your browser's available memory and processing resources.
Do my files get uploaded to a server?: No. Normalize audio runs entirely in your browser with WebAssembly, so your MP4, MOV, WebM (with audio) file never leaves your device and nothing is stored or seen by us.
What can I put in, and what do I get out?: Normalize audio accepts MP4, MOV, WebM (with audio) and gives you back a MP4 file. Actual codec support depends on what the bundled engine or browser decoder can read.
Does Normalize audio change my original file?: No. It never touches your original — Normalize audio creates a brand-new MP4 file to download and leaves the source on your device untouched.