Audio Volume Booster
Raise or lower decoded audio amplitude and export a WAV file. Your files are never uploaded to our servers. ToolkitPoint processes them on your own computer, so confidential documents stay with you.
Processed in your browser. Your files are not uploaded.
How to use Audio Volume Booster
- Press "Choose Audio File" or "Load Demo Audio" to fill the waveform view.
- Either drag "Volume Gain Multiplier" from 0% to 1000% (200% is +6.0 dB), or under "Loudness target, limiter and export" pick a target such as -14 LUFS (YouTube/Spotify), -16 LUFS (podcast) or -23 LUFS (broadcast).
- Keep "Smart Studio Peak Limiter" ticked and set the peak ceiling (default -1 dBFS); shape the tone with the Bass, Vocal Clarity and Treble sliders if needed.
- Optionally enter a start and end time to boost only that part, then press "Measure before and after" to see loudness and peak readouts.
- Choose the output format (same as input, WAV, MP3, M4A, OGG or FLAC) and download. A video file can be boosted too: the picture is copied unchanged.
Worked example
Load a quiet voice memo, choose Target -16 LUFS with a -1 dBFS ceiling and press Measure before and after. The table might show -31 LUFS before and -16.1 LUFS after with the peak at -1.0 dBFS. Download it as MP3, or pick a video file to get the same result with the picture copied unchanged.
When to use this tool
- Making a whispered interview clip loud enough for a phone speaker.
- Bringing a low-level lecture recording up to a comfortable listening level.
- Comparing an original and boosted version quickly with the A/B button before exporting.
Important limitations
The limiter is a sample-peak limiter, so inter-sample true peaks can still exceed the ceiling after lossy encoding. Loudness targets are reached only if the limiter can keep peaks under the ceiling; the table shows what was actually measured. Files are decoded in memory (about 250 MB ceiling).
Comparing alternatives
Other options for audio volume booster include AudioTrimmer Volume Booster, 123apps Volume Booster, VideoCandy Audio Booster, OnlineConverter Audio Booster.
ToolkitPoint is not affiliated with those services.
Frequently asked questions
How does the percentage translate into decibels?
The slider value divided by 100 is the linear multiplier, and decibels equal 20 times log10 of that number. So 200% is about +6.0 dB, 300% is +9.5 dB and 1000% is +20 dB.
How are the loudness targets measured?
With the ITU-R BS.1770 integrated (gated) method on your device. With a target chosen, the tool measures the limited result and adjusts the gain, up to four passes, then shows the loudness it actually reached. Sample peak is reported, not inter-sample true peak, so keep about 1 dB of headroom for lossy formats.
Is the limiter a true brick-wall limiter?
The download now uses a look-ahead peak limiter (5 ms) that holds the sample peak at your ceiling; the table shows the measured peak. The live Play Boosted preview still uses the browser's dynamics compressor (-0.5 dB threshold, 12:1), so it can sound slightly different.
What does the headroom badge measure?
It only reflects the slider position, not your file's real peak. Use Measure before and after for actual loudness and peak values.
What about video?
Choose a video file in the video box. Its audio is boosted with the same settings and muxed back with the video stream copied bit for bit, so the picture is untouched and it finishes quickly. The audio is re-encoded to AAC at 192 kbps. Files over 250 MB are refused.
Which file comes out?
By default the same format as the input (MP3, M4A, OGG, FLAC or WAV, otherwise WAV), or the format you pick. Bitrate applies to MP3, M4A and OGG only and is disabled for WAV and FLAC.