Video & Audio
Volume Booster
Raise or even out the volume of sound files and videos, without clipping. No upload, no signup.
Files stay on your device How it works
Drop files here, paste, or
MP4, MOV, WebM, MKV, MP3, M4A, AAC, WAV, OGG or FLAC · up to 5 files, 25 MB each
Your files
Your file is ready
How to make audio louder
- Choose up to 5 files, sound files (MP3, M4A, AAC, WAV, OGG, FLAC or WebM) or videos (MP4, M4V, MOV, WebM or MKV), each up to 25 MB and 30 minutes long.
- Pick how to change the level and, for sound files, the format to save.
- Press Change volume, then download each file, or all of them together as a ZIP: podcast-episode.mp3 becomes podcast-episode-louder.m4a.
The three ways
- Even out to a loudness: brings each file to the loudness you pick, in LUFS, so files at the same target sound about equally loud played one after another. It makes a file that’s louder than the target quieter.
- As loud as it goes without clipping: raises the level until the loudest moment is 1 dB below the most a file can hold.
- Change by a set amount: up or down by up to 20 dB.
How it’s measured
First the whole file is measured: its loudest moment, the peak, and its loudness, the way ITU-R BS.1770 and EBU R 128 measure it. Loudness is measured in 0.4-second blocks and gated, so silence and very quiet stretches don’t count; a file shorter than one block can’t be measured this way. Then the whole file changes by one amount, so its quiet and loud parts keep their difference: this isn’t a compressor. The peak is never lifted above −1 dB below full scale; when a target would need more, the tool stops there and says so. A silent file is refused.
What you get
The sound is re-encoded at its new level: M4A as AAC and OGG as Opus, at 192 kbit/s, and WAV as uncompressed 16-bit sound, up to 10 minutes long. With “Same format”, MP3, FLAC and AAC files come out as M4A. A video keeps its format: its picture is copied, not re-encoded, and only its sound changes. The note under each result shows the change, the loudness and the peak, before and after.
Which browsers work
The sound is decoded and made anew, so it needs a current Chrome, Edge or Firefox, or Safari 26 or later. Firefox can’t make AAC: there, save sound files as WAV or OGG, and an MP4 or MOV video gets Opus sound, which browsers and VLC play.
Good to know
Your files stay on your device; nothing is uploaded. A quieter result is named with “-quieter”. The Audio Converter changes a file’s format and leaves its level alone; this tool changes the level.