Change audio volume
Make audio louder or quieter by a percentage, clipping at full scale, and save it as MP3, M4A, OGG, WebM or WAV.
Process locally
Files stay in this browser session. Closing or clearing releases them.
Choose files
MP3, WAV, M4A, AAC, OGG, FLAC, WebM, up to 10
Drop files here, or
Adjust settings
Optional: Volume, Output format, Bitrate
Run
Processes in this browser; cancel at any time
About this tool
Make audio louder or quieter, for example to boost a quiet voice memo or lecture recording, to tone down a track that is too loud, or to bring several clips closer in level before you use them together.
Set the volume as a percentage from 0 to 500: 100 leaves it unchanged, and 150 is the default. Up to 10 files, 80 MB in total, are processed and saved as MP3, M4A, OGG, WebM or WAV. Everything runs in your browser, and the files are not uploaded.
How to use it
- Choose up to 10 MP3, WAV, M4A, AAC, OGG, FLAC or WebM files, or drop them on the page.
- Enter the “Volume” as a percentage, for example 200 to double the amplitude or 50 to halve it.
- Pick the “Output format”, MP3 by default, and, for MP3, M4A, OGG and WebM, the “Bitrate”.
- Select Run, play the results on the page, then download them one by one or all together as a ZIP.
Formats and limits
- Input
- MP3, WAV, M4A, AAC, OGG, FLAC, WebM, up to 10 files
- Output
- MP3, M4A, OGG, WebM, WAV
- Size limit
- 80 MB per file
- Settings
- Volume; Output format (MP3, M4A, OGG, WebM, WAV); Bitrate (64 kbps, 96 kbps, 128 kbps, 192 kbps, 256 kbps, 320 kbps, Encoder default)
- Privacy
- Files stay in the current browser session. No file bytes are uploaded.
- Price
- Free, no sign-up
Common questions
Why does the louder audio sound distorted?
Every sample is multiplied by the percentage, and samples that would go past full scale are cut off (clipped), which sounds harsh. Use a smaller percentage, especially for audio that is already loud in places.
Does it normalise the volume?
No. The same factor is applied to the whole file, so quiet and loud passages change by the same ratio. In decibels, 200% is about +6 dB and 50% about −6 dB.
Can I keep the MP3 format?
Yes. “MP3” is the default “Output format”. Changing the volume always re-encodes the audio; MP3 is encoded with the LAME encoder at the chosen “Bitrate”, 192 kbps by default.
Why does a file fail to process?
Your browser decodes the file and encodes OGG and WebM, and M4A when it has an AAC encoder; otherwise, as in Firefox, FFmpeg’s AAC encoder (ffmpeg.org, listed in /THIRD_PARTY_NOTICES.txt) makes the M4A. If the browser cannot decode the file or encode the chosen format, the error says so; try MP3, M4A or WAV, or another browser.
Workflows that use this tool
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