Audio Volume Booster — Free Online

Recordings made on a phone, a laptop microphone, or a consumer interface often come out too quiet. Boosting the volume in post is a standard step, but simply amplifying a waveform risks pushing peaks above 0 dBFS and introducing digital clipping — a harsh distortion that ruins otherwise usable audio. A proper volume tool needs a limiter to catch those peaks.

This volume booster lets you increase or decrease the gain of any audio file by a specified number of decibels. A built-in peak limiter automatically prevents clipping, so you can apply aggressive boosts without worrying about distortion. It is ideal for normalising quiet recordings before sharing or further editing.

How to Boost Audio Volume Online

1. 1

   Upload your audio file

   Drop any MP3, WAV, FLAC, OGG, or AAC file. Files up to 100 MB are supported.

2. 2

   Set the volume increase

   Enter a volume boost in dB (e.g. +6 dB doubles the volume). Use negative values to reduce volume.

3. 3

   Download your boosted audio

   Click Apply. FileCrank adjusts the volume and exports your audio. Files are deleted within 1 hour.

How Gain Adjustment and Peak Limiting Work

Volume adjustment applies a linear amplitude multiplier to every sample in the audio stream. A gain of +6 dB doubles amplitude; +20 dB multiplies it by ten. The tool uses WebAssembly FFmpeg's volume filter to apply the specified gain in a single pass over the decoded PCM data.

The peak limiter is implemented as a lookahead brickwall limiter: it scans a short window of future samples to detect incoming peaks, and attenuates the signal just enough to keep all samples below 0 dBFS. This prevents clipping without introducing the pumping artefacts of a slower compressor. The combined gain-and-limit operation is applied before re-encoding, so the output file contains clean, full-volume audio.

Why Use FileCrank to Boost Volume?

• ✓ Boost or reduce volume by any amount in dB.
• ✓ Supports MP3, WAV, FLAC, OGG, and AAC input.
• ✓ Option to normalize audio to prevent clipping.
• ✓ No watermarks, no signup, completely free.
• ✓ Files are processed securely and deleted within 1 hour.

機能と仕様

最大ファイルサイズ

最大100 MB

プライバシー

ファイルは約1時間後に削除されます

料金

無料、登録不要

処理方式

サーバーサイド

Frequently Asked Questions

Dedicated Booster vs Manual Normalisation in a DAW

DAWs offer normalisation and gain stages, but require loading the file into a project and exporting. Command-line FFmpeg can apply the volume filter directly, but requires knowing the correct syntax. This tool wraps both the gain and the limiter in a guided interface, making the operation accessible without any technical background and without leaving the browser.

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