Audio Volume Normalizer

How it works

How to normalize audio volume

Measure, adjust, done.

1
Add files
Drop one or many audio or video files onto the page.
2
Pick a target
−14 LUFS for streaming, −16 for podcasts, −23 for broadcast — or normalize peaks or set a gain.
3
Normalize & download
Each file is measured and adjusted. Check the before/after values and download.

Why ToolCMB

Consistent volume, the professional way

Loudness measured like broadcasters and streaming services do.

Real loudness (LUFS)

Uses the ITU-R BS.1770 loudness model with gating — the same measurement Spotify, YouTube and TV stations use.

Platform presets

One click for Spotify/YouTube (−14), Apple Music & podcasts (−16), EBU R128 (−23) or ATSC A/85 (−24).

True-peak limiter

When files get louder, a look-ahead limiter keeps peaks under the ceiling — no clipping, no distortion.

Album mode

Apply one common gain to a whole album so quiet intros stay quiet.

Peak & manual gain

Classic peak normalization or simply +6 dB / −3 dB on every file.

Before / after report

See integrated loudness, applied gain and true peak for every file.

Private

Nothing is uploaded — measurement and processing run on your device.

Batch

Normalize a whole podcast season or playlist at once.

Loudness vs. peak normalization

Peak normalization raises the volume until the loudest sample reaches a level such as −1 dBFS. It is simple, but two files with the same peak can sound very different in loudness — a single drum hit can stop a quiet recording from getting louder.

Loudness normalization measures how loud the audio is perceived over its whole length, in LUFS (Loudness Units relative to Full Scale), and adjusts the gain so every file reaches the same perceived loudness. Streaming services normalize playback this way, so mastering to their target avoids being turned down — or up with added limiting.

Raising quiet audio can push peaks above 0 dBFS. The true-peak ceiling (−1 dBTP by default) and the built-in limiter prevent clipping, including the inter-sample peaks that appear when audio is converted to MP3 or AAC.

Loudness targets

Platform / standard	Target	Max. true peak
Spotify, YouTube, Tidal, Amazon Music	−14 LUFS	−1 dBTP
Apple Music, Apple Podcasts	−16 LUFS	−1 dBTP
Podcasts (mono)	−19 LUFS	−1 dBTP
EBU R128 (European TV & radio)	−23 LUFS	−1 dBTP
ATSC A/85 (US TV)	−24 LKFS	−2 dBTP
Club / loud masters	−9 to −6 LUFS	−0.1 to −1 dBTP

Tips

Just want to measure? The LUFS Calculator shows loudness, true peak and loudness range without changing the file.
Joining clips with different volumes? Normalize them first, then use the Audio Joiner.
Remove long pauses from speech with the Silence Remover.
Smaller files for sharing: the MP3 Compressor.

FAQ

Frequently asked questions

Can’t find your answer? Contact us — we reply quickly.

What does normalizing audio mean?

It changes the volume of a file to a target level — either the perceived loudness (LUFS) or the highest peak — so that different files play back at a consistent volume.

Which LUFS should I use?

−14 LUFS for music on Spotify, YouTube and most streaming platforms; −16 LUFS for Apple Music and podcasts; −23 LUFS for European broadcast; −24 LKFS for US TV.

Will normalizing cause distortion?

No. If the gain would push peaks above the ceiling, a transparent look-ahead limiter catches them, so the result never clips.

What is album mode?

All files get the same gain, calculated from their combined loudness. The album reaches the target on average, and the differences between songs are preserved.

Is the audio quality affected?

Only the volume changes. WAV and FLAC stay lossless; MP3, M4A and OGG are re-encoded at a bitrate matching the original.

Are my files uploaded?

No. Measurement and processing happen in your browser.