AudioBento

Audio Normalizer

Free online audio normalizer for MP3, WAV and more. Choose a LUFS target, normalize in your browser, compare results, and download MP3 or WAV.

Related Audio Tools

Audio Volume BoosterIncrease the volume of quiet audio.Audio NormalizerAdjust whole-track loudness toward a chosen LUFS.Bass BoosterMake existing bass frequencies more prominent.Audio EqualizerShape your sound with five EQ bands and ready-made presets.

How to normalize audio

  1. 1

    Choose and listen

    Choose one supported audio file. Play the source and check the recording before selecting your target loudness.

  2. 2

    Choose your target

    Choose a listening scenario, or select Custom to set -30 to -8 LUFS in 0.5 steps. Select MP3 or WAV for export.

  3. 3

    Normalize and download

    Click Normalize audio to process the whole track locally. Compare the source with the audio in Result, then download.

Normalize audio volume and loudness

Use this loudness normalizer to bring one recording toward a LUFS target, then compare the processed result with the original.

01

Target whole-track loudness

Audio normalisation uses LUFS to adjust the perceived loudness of a whole recording rather than applying a fixed percentage gain. The single-pass loudnorm filter targets your selected level and uses a fixed true peak ceiling. The final loudness can differ from the target.

  • Five scenario presets plus custom targets from -30 to -8 LUFS
  • Fixed -1.5 dBTP true peak ceiling
  • Source playback; comparison after processing

Settings example

Target about -16 LUFS

True peak ceiling: -1.5 dBTP

Listen to the source before processing
02

Sound leveling for spoken recordings

For more consistent listening across interviews or voice notes, choose the same LUFS target for separate recordings, one file at a time. Compare each result with the original to review speech, pauses, and remaining background noise.

  • Use a consistent target for separate recordings
  • Review speech and pauses after processing
  • Background noise remains in the recording

Settings example

Target about -16 LUFS

True peak ceiling: -1.5 dBTP

Listen to the source before processing
03

Compare music at a chosen level

Adjust the integrated loudness of a music clip before sharing it. Compare the processed track with the original to judge dynamics and peaks. Normalization is a loudness task, not AI mastering.

  • Choose a quieter or louder target
  • Single-pass processing can change dynamics
  • Existing clipping cannot be repaired

Settings example

Target about -14 LUFS

True peak ceiling: -1.5 dBTP

Play the source and Result after normalization
04

Export audio for a presentation

Prepare one recording for a slide deck, lesson, or demo. Export MP3 for a smaller file or WAV to avoid another lossy encoding stage. Listen on the equipment you intend to use.

  • MP3 output with six bitrate choices
  • WAV output at the source sample rate
  • Changed output settings require a new result

Settings example

Target about -16 LUFS

True peak ceiling: -1.5 dBTP

MP3 or WAV after processing

Audio Normalizer FAQ

How is audio normalization different from MP3 gain or a Volume Booster?
A Volume Booster changes gain by a chosen percentage. Some MP3 gain tools adjust playback levels without re-encoding, but this normalizer processes the whole recording toward a LUFS target, applies a true peak ceiling, and re-encodes the exported file. It can raise or lower loudness; it is not a fixed-percentage boost.
Will the result exactly match my target LUFS?
The target is approximate. Single-pass loudnorm adjusts integrated loudness and dynamics, but the source, peak limits, and output encoding can affect the final value. Compare the result and measure the exported file if your delivery needs an exact LUFS value.
Can I hear normalized audio before processing?
Before processing, the player plays the source audio without a mode selector. A gain preview cannot reliably represent whole-track loudness normalization. Click Normalize audio first, then play the actual encoded output in Result. Each player has its own playback position.
Can normalization repair clipping or remove noise?
Normalization cannot repair peaks that are already clipped or remove background noise. It also does not guarantee a lossless quality improvement. A louder target can make noise more noticeable, and single-pass processing can change the recording’s dynamics.
Does my audio leave my device?
Your file stays in your browser during normalization. FFmpeg WASM is downloaded from a CDN when you first process audio; the CDN supplies the program and does not receive your audio. There is no server processing, account requirement, or saved history for this tool.
Which files can I normalize?
Choose MP3, WAV, M4A, FLAC, OGG, or AAC audio with up to 2 channels and a sample rate up to 48 kHz. The browser must support playing the input codec. File headers and resource limits are checked before processing; unsupported or damaged files are rejected.
Can I normalize a long recording?
There is no fixed minute limit. Current input budgets are 200 MB on desktop and 100 MB on mobile. Duration, channels, and format also affect output size and memory use. If WAV would exceed the output budget, choose MP3 or use a shorter recording.
What happens when I change the export settings?
Export MP3 with a selected bitrate or WAV without a bitrate setting. After settings change, the existing file stays ready in Result with its exported settings displayed. Normalize again to replace it on success; failure or cancellation keeps it. MP3 encoding is lossy.

Set a loudness target for your audio

Choose a file, normalize it locally, and compare the result.