Volume booster
Make a recording that's too quiet on your phone, speech captured from across the room, or a podcast exported at a low level easy to hear. A peak limiter keeps the sound from distorting.
Free · no sign-up · your file is processed in your browser and never sent to a server
No file handy? Try it with a 20-second Turkish meeting recording.
Other pages for this tool
How to use
- Choose your fileDrop your quiet recording; the tool shows the file's peak level in dBFS.
- Set the levelChoose a gain in dB, or turn on "Auto boost": the whole recording is raised so the peak lands at -1 dBFS.
- Listen and downloadListen to the first 10 seconds, apply and download.
One tool, three controls
| Control | What changes | What stays the same |
|---|---|---|
| Speed (preserve pitch on) | Duration | How high or low the voice sounds |
| Speed (preserve pitch off) | Duration and pitch together, like tape | — |
| Pitch | How high or low the voice sounds (semitones) | Duration |
| Volume | Loudness (dB); a limiter prevents clipping | Duration and pitch |
Normalize or add gain?
- Normalize: Raises the recording to the highest level possible without distortion. The first choice for quiet but clean recordings.
- Gain (+dB): Raises by a set amount. If the peaks hit the ceiling, the limiter steps in and gently holds back just those moments.
- Cut (-dB): Lowers recordings that are too loud or distorted.
Each +6 dB roughly doubles the signal amplitude. How much louder it sounds to the ear depends on the recording and the listening environment.
Boosting also raises the noise. If there's a hum in the recording, run it through noise reduction first.
Privacy: your file never leaves your device
Everything happens in your browser. Your file is not sent to Voiser's servers or stored anywhere, and it's cleared from memory when you close the tab. That's also why the tool stays fast on a slow connection.
Common questions
Will boosting the volume distort the sound?
The peak limiter prevents clipping. With very large gains (for example +15 dB and above), the limiter works hard and the sound can feel squashed; try normalizing first.
What does dBFS mean?
It's the unit of digital audio level; 0 dBFS is the highest point that can be recorded. The tool shows your file's peak in this unit.
Can I boost the audio of a video?
Get the audio first with extract audio from video, then boost it here. This tool doesn't produce video files.
Can I even out the levels of several files?
Normalize each file separately, then combine them into one with the audio joiner.
Related tools
- Remove background noiseReduce fan noise, hum and hiss in a recording, in your browser.
- Change audio speedSpeed audio up or slow it down without changing its pitch.
- Audio joinerMerge several audio files into one, in the order you choose.
- MP3 cutter and audio trimmerSelect any part of an audio file on the waveform and cut it out.
- Extract audio from videoSave the audio track of your own videos as MP3, M4A or WAV.
An audible recording, a readable transcript.
Transcription turns your recording into time-stamped text and separates the speakers in meetings and interviews.