How to normalize audio volume
Drop one or more audio files into the page, choose a loudness target and true peak ceiling, then click Convert. Volume Normalizer measures each file first, then creates a separate output. The report records integrated loudness, true peak, loudness range, gain change, and clipping risk for the selected settings.
- Add files with
Drop one or more audio files hereorbrowse files. - Choose a
Loudness standardand aTrue peak ceiling. - Select an
Output format, then clickConvert. - Review each report and choose
Download, or chooseDownload all (.zip)for multiple completed files.
Audio loudness normalization targets
Loudness standard contains EBU R128 at -23 LUFS, ATSC A/85 at -24 LKFS, Podcast delivery spec at -16 LUFS, and Custom target.... The True peak ceiling choices are -1.0, -2.0, and -0.1 dBTP, with Custom... for another ceiling.
Input: song.wav
Loudness standard: EBU R128 (-23 LUFS)
True peak ceiling: -1.0 dBTP
Output: song-normalized.wavWhen you choose Custom target..., enter a value from -70 to -0.5 LUFS. A custom ceiling must be from -20 to 0 dBTP. Values outside those ranges stop processing and show an error before measurement begins.
What the volume normalization report shows
After Convert starts, the page measures each file and then normalizes files with usable measurements. Each card reports Integrated loudness in LUFS, True peak in dBTP, Loudness range in LU, Gain change in dB, Clipping risk as Low, Medium, or High, and the chosen output settings.
The clipping estimate compares the predicted peak after the gain change with the selected ceiling. A file with incomplete measurement data gets an Error status and is skipped during normalization. Completed cards show Download.
How to normalize multiple audio files
Add several files before clicking Convert. The page measures and normalizes them one at a time, keeping every output separate. When more than one file finishes, Download all (.zip) packages the completed outputs.
The first run loads the FFmpeg/WebAssembly engine in the browser. The selected audio is passed to that local engine. The page contains no upload request for the files you choose.
What output format changes
WAV (16-bit PCM, recommended) creates a new 16-bit PCM WAV with pcm_s16le. FLAC (lossless, smaller file) uses the FLAC encoder. MP3 320 kbps (lossy re-encode) uses libmp3lame and re-encodes the audio, discarding some data beyond the gain change.
Examples with the available targets
- For a podcast delivery copy, select Podcast delivery spec (-16 LUFS), review the gain change and clipping risk, then choose an output format.
- For broadcast delivery, compare the file with EBU R128 (-23 LUFS) or ATSC A/85 (-24 LKFS) before creating a WAV output.
- For a batch, add several files, keep each normalized output separate, and use
Download all (.zip)after processing.
Choose the right audio editing tool
Use Audio Edit Tools for direct changes to local audio files. Choose Audio Cleaner to reduce steady background noise, hum, hiss, or room echo. Choose Audio Effects Editor for pitch, tempo, fades, reverse, or a selected timeline range. Choose Trim Audio to select a start and end point.
Frequently asked questions
How do I normalize audio loudness to -23 LUFS?
Choose EBU R128 (-23 LUFS) - EU broadcast delivery under Loudness standard, set a True peak ceiling, select an Output format, and click Convert.
Can I normalize multiple audio files at once?
Yes. Add multiple files, click Convert, and download each completed file or use Download all (.zip). The files are processed independently and are not merged.
Does normalizing audio overwrite the original file?
No. The process creates a new normalized output, while the selected input remains separate. WAV output is a new 16-bit PCM file.
What happens when an audio file cannot be measured?
The file card shows an Error status, and that file is skipped during normalization. Use Remove on the card, add the file again, and run Convert again.