—LUFS
—RMS
—PEAK
NORM / AVAILABLE NOW
Audio Normalizer
Hit a measured loudness target. Measure Integrated LUFS, RMS, and sample peak, then normalize locally with an adjustable peak ceiling.
NORM / loudness workbenchBS.1770 analysis in a local worker
—LUFS
—RMS
—PEAK
Original and normalized previews appear here after you choose a file.
GUIDE / audio normalizer online
What is audio normalization?
Audio normalization measures a whole recording and applies one constant gain change so a selected level reaches a target. SoundTools offers K-weighted, gated Integrated LUFS for perceived program loudness, RMS for average signal energy, and sample-peak normalization for the highest decoded sample. A separate ceiling prevents positive gain from pushing that sample peak above the chosen limit.
RELATED USES
- normalize audio online
- MP3 normalizer
- LUFS normalizer
- normalize audio volume
- loudness normalization
FIELD NOTES / 01
A real local processor, not a decorative upload box
BS.1770 K-weighted analysis + PCM gain worker runs after you choose a source and explicitly start the operation. The audio samples remain in browser memory; SoundTools does not send the selected media to an application endpoint.
Choose Integrated LUFS, RMS, or Sample Peak, set the target, and use a sample-peak ceiling for LUFS or RMS mode. The page reports input and output meters plus the exact gain applied before enabling WAV or MP3 export. Results remain available for preview and download only in the current tab. Closing or refreshing the page releases those temporary objects.
REFERENCE / MODE CHOICE
LUFS vs RMS vs peak normalization
All three modes apply one constant gain change, but they choose that gain from different measurements. Use the row that matches the delivery problem you are solving.
| Method | Best for | What it measures | Important limit |
|---|---|---|---|
| Integrated LUFS | Finished podcasts, videos, and listening copies | K-weighted, gated program loudness across the complete file | A peak ceiling can prevent a loud transient from reaching the requested target |
| RMS | Steady signals and average-energy matching | Unweighted average sample energy across channels and time | It does not model perceived loudness or ignore quiet sections with a gate |
| Sample peak | Exact digital headroom and peak-safe handoffs | The highest decoded sample in any channel | It says nothing about average or perceived loudness between peaks |
PROCESS / THREE STEPS
How to use audio normalizer
- 01
Choose the local source
Open a compatible file in the dedicated workbench at the top of this page. The browser validates and decodes it without an upload step.
- 02
Set the useful controls
Choose Integrated LUFS, RMS, or Sample Peak, set the target, and use a sample-peak ceiling for LUFS or RMS mode. The page reports input and output meters plus the exact gain applied before enabling WAV or MP3 export.
- 03
Process, check, and export
Run the local processor, inspect the status and preview, then save Normalized WAV · MP3 when the result is ready.
SIGNAL NOTES / VERIFIED BEHAVIOR
What this tool actually does
Clear limits are part of a useful tool. These values describe the processor currently running in this page.
The work is executed in the page through browser workers, WebAssembly, Web Audio, or WebGPU as stated.
Runtime and model assets may be downloaded, but the selected file is not attached to those requests.
The dedicated workbench exposes only formats it can actually produce in the current browser.
USE CASES / 02
Useful reasons to open audio normalizer
- Podcast and voice handoff
Move one finished recording toward a chosen Integrated LUFS target before a final quality check.
- Consistent listening copies
Apply measured RMS or LUFS gain to clips that otherwise require frequent volume adjustment.
- Peak-safe file preparation
Set an exact sample-peak target for a local WAV or MP3 copy without changing the source file.
QUESTIONS / PRACTICAL ANSWERS
Questions about this tool
Answers based on the current browser processor—not promises about a future version.
01Is my audio uploaded for processing?
No. Audio samples stay in browser memory. The page may download a codec or model asset, but it does not send the selected file with that request.
02Why can the first run take longer?
This tool uses BS.1770 K-weighted analysis + PCM gain worker. A browser may need to download and initialize that runtime before the first operation; later runs can reuse cached assets.
03Can I preview the result before saving?
Yes. Audio-producing tools expose local result players, while analysis and transcription tools show their detected data before download.
04What happens when the browser is unsupported?
The workbench reports the missing capability instead of uploading the media or pretending that processing is still running.
05Do I need an account or install?
No. The tool opens directly in a compatible browser, requires no SoundTools account, and creates its temporary working state on the current device.
06What is the difference between LUFS, RMS, and peak normalization?
Integrated LUFS uses K-weighting and gating to estimate perceived loudness across the program. RMS measures average sample energy. Peak mode looks only at the largest decoded sample.
07Why did the output not reach my LUFS target?
A loud transient may hit the selected sample-peak ceiling before the complete program reaches the requested LUFS value. The status and output meters show when that safety limit reduced the applied gain.
08Does normalization compress quiet and loud sections?
No. SoundTools applies one constant gain value to the complete file, so the internal dynamic range stays the same. Use a compressor when you need to reduce the difference between quiet and loud passages.