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Make a quiet video or audio file louder without distortion. Boost it by a set amount or normalize it to a standard loudness. The video picture is copied untouched, and nothing is uploaded.
Your media is processed in your browser and is not uploaded to our servers for conversion. Page assets (including the converter engine) still load over the network.
Select or drop a video or audio file
MP4, MOV, WebM, MKV, MP3, M4A, WAV and more. Video is copied without re-encoding.
Click, tap, or drop a fileChoose the file
Drop or select a video (MP4, MOV, WebM, MKV) or an audio file (MP3, M4A, WAV).
Pick boost or normalize
Boost raises the volume by the amount you choose. Normalize brings it to a standard loudness.
Process
Only the audio is re-encoded; the video picture is copied as is.
Listen and download
Play the result in the page. If it's still quiet, run again with a bigger boost.
Boost multiplies the audio level by the number of decibels you choose: +6 dB sounds about one and a half times as loud and +10 dB about twice as loud. Simply amplifying makes the loudest moments clip and crackle, so a limiter holds peaks just below the maximum while the rest gets louder.
Normalize analyses loudness as it goes and adjusts it to about -16 LUFS, the level commonly recommended for podcasts. It makes quiet recordings louder and loud ones slightly quieter, which is handy for a batch of clips that should sound alike.
A limiter keeps peaks from clipping even at +20 dB.
The picture is copied without re-encoding, so only the sound changes.
Works with MP4, MOV, WebM and MKV videos, and MP3, M4A, WAV, FLAC and OGG audio.
Recordings are processed on your device and never uploaded.
No. Processing runs in your browser with a WebAssembly build of FFmpeg. Your file is read from your device and the result is saved back to it.
Start with +6 dB. Phone recordings of a distant speaker often need +10 to +15 dB. If a boost still sounds quiet, the recording probably has a few loud spikes; try Normalize.
Not from clipping, because a limiter holds the peaks. But boosting also raises background noise, so a noisy recording will sound noisier.
Boost adds a fixed amount of gain. Normalize targets a standard loudness, so it can also turn a loud file down.
No. The video stream is copied as is; only the audio is re-encoded.
Videos up to 500 MB on a computer (250 MB on a phone). Audio files up to 4 GB on a computer.