About Volume Booster
Some recordings are simply too quiet: a lecture captured from the back of the room, a voice memo recorded across a table, a podcast that arrives normalised far below the level of everything else in your playlist. Raising the volume is the fastest fix, and it does not need a full audio editor when the job is only a gain change.
This tool multiplies the samples of the file by the percentage you choose, from 50% (half the original level) up to 400% (four times louder). The work happens on our server with FFmpeg's volume filter, so it is fast and consistent, and you can export the result as MP3, WAV or M4A. High gain can push peaks past the digital ceiling, so the tool warns you before a level likely to clip.
What this tool does
50% to 400% control
100% keeps the original level, 200% doubles it and 400% is four times louder. The slider updates in 10% steps so the loudness change is predictable.
Clipping warning
Boosting raises every sample, including peaks that were already close to maximum. A warning appears above 200% so you can choose a safer level before the job runs.
MP3, WAV or M4A output
Export a portable MP3, an uncompressed WAV for further editing, or an efficient M4A, with a bitrate choice for the two lossy formats.
Same length, same content
Gain is a level change only, so the duration, channels and timing of the recording are unchanged. Nothing is trimmed or faded.
Any common audio input
Upload MP3, WAV, M4A, AAC, FLAC, OGG, OPUS or WMA files up to 100 MB; the server decodes the source and applies the gain once.
Temporary files only
The upload and the louder copy exist in a temporary directory for the duration of the job and are deleted automatically after the download.
How to use Volume Booster
- 01
Upload the quiet audio file
Drop an MP3, WAV, M4A or another supported audio file into the workspace, or click to browse. Files up to 100 MB are accepted.
- 02
Choose a boost level
Start around 150% to 200% for a noticeably louder file. Use higher values only when the recording has plenty of headroom.
- 03
Pick the output format
Choose MP3 for sharing, WAV for editing or M4A for a small file that Apple devices play natively, then set a bitrate if the format is lossy.
- 04
Boost and download
Click Boost volume, compare the result with the player, then download the file. If it distorts, start over with a lower level.
Supported formats and limits
- Input
- MP3WAVM4AAACFLACOGGOPUSWMA
- Output
- MP3 / WAV / M4A
- Processing
- Server-side FFmpeg job in a temporary directory, deleted after download.
- Maximum size
- Up to 100 MB
- Requirements
- Chrome, Edge, Firefox or Safari · Server-side FFmpeg conversion
Limitations worth knowing
- Gain only: there is no compressor, limiter or noise reduction, so loud peaks can clip at high levels.
- One file per job, up to 100 MB, with a three-minute processing limit.
- MP3 and M4A outputs are lossy re-encodes; WAV output is uncompressed but large.
- Boosting amplifies existing hiss and room noise along with the voices you want.
Privacy and file handling
Your audio file is uploaded to a temporary working directory on our server, boosted with FFmpeg's volume filter, and streamed back as a download. The upload and the louder copy are deleted automatically when the download finishes; nothing is stored permanently or shared.
Read the full privacy policy