Audio Volume Booster

About Volume Booster & Normalizer

This online audio volume booster allows you to increase the volume of your audio files or normalize their loudness directly in your browser. Choose between boost mode to amplify volume by a specific amount, or normalize mode to achieve consistent loudness levels. All processing happens locally for complete privacy.

What audio formats are supported?

Input: MP3, WAV, OGG, AAC, M4A, and other common formats. Output: You can choose to keep the same format as input or convert to MP3, WAV, OGG, or AAC.

What is the difference between Boost and Normalize?

Boost mode increases volume by a fixed multiplier you choose (e.g., 2x doubles the volume). Normalize mode intelligently adjusts the audio to a standard loudness level using EBU R128, making it consistent with other normalized audio files. Use Boost for simple volume increase, use Normalize for professional loudness matching.

Will boosting volume cause distortion?

If you boost too much (especially above 2x or 200%), the audio may clip or distort, especially if the original audio is already loud. Start with moderate boosts like 1.5x (50%) and increase if needed. Normalize mode prevents clipping by intelligently adjusting dynamics.

Why does boosting cause clipping and how does the true-peak limiter help?

A plain volume multiplier raises every sample equally, so any peak already near 0 dBFS is pushed past full scale and hard-clips into harsh digital distortion. The 'Prevent clipping' true-peak limiter (on by default) applies your gain and then transparently catches any sample that would exceed a -1 dBTP ceiling, letting you boost aggressively (even 4x) while keeping the output free of clipping and within streaming/broadcast true-peak (dBTP) specs.

What LUFS target should I use for Spotify, YouTube, Apple and broadcast?

Use -14 LUFS for Spotify and YouTube, -16 LUFS for Apple Music and most podcasts, -19 LUFS for audiobooks (ACX-style), and -23 LUFS for broadcast (EBU R128). Normalize mode runs a two-pass ITU-R BS.1770 measurement so it actually hits the chosen integrated loudness, with the true-peak held at -1 dBTP. Pick your delivery platform's target and the tool matches it precisely.

What is the file size limit?

The maximum file size is 50MB. This ensures smooth processing in your browser. For larger audio files, consider using desktop audio editing software.

How does normalization work?

Normalization uses the loudnorm filter based on EBU R128 standard, which measures perceived loudness rather than peak levels. It analyzes your audio and adjusts it to -16 LUFS (Loudness Units Full Scale), the standard for broadcast and streaming. This ensures consistent volume across different tracks.

Can I preview before downloading?

Yes! You can play the original audio to hear how it sounds, then after processing, preview the boosted or normalized version before downloading.

Is my audio file safe?

Absolutely! All audio processing happens directly in your browser using FFmpeg.wasm (WebAssembly). Your audio file is never uploaded to any server. Everything stays private on your device.

What quality settings should I use?

Use 'High' (320kbps for MP3) for best quality. Use 'Medium' (192kbps) for balanced quality and file size. Use 'Low' (128kbps) for smaller file sizes when quality is less critical.

How long does processing take?

Processing time depends on your audio file length and device performance. A typical 3-minute audio file takes 10-20 seconds to process. Normalization may take slightly longer as it analyzes the entire audio first.

Can I use this for music, podcasts, or voice recordings?

Yes! This tool works perfectly for any audio type. Boost mode is great for quiet recordings or music. Normalize mode is ideal for podcasts, audiobooks, or music playlists where you want consistent volume levels.