21 Effects
Volume BoosterIncrease the volume of audio online
Make quiet audio loud and clear: boost it up to 300% or normalize it to -16 LUFS.
Drop your audio here
MP3, WAV, FLAC, OGG, M4A · up to 100 MB and 10 minutes
orFree · local processing · no account
Engines and licensesAbout Volume Booster
Volume Booster has two ways to make audio louder. In Boost mode you multiply the signal by the percentage you choose, from 100 to 300%. In Normalize mode the perceived loudness of the whole file is measured and brought to -16 LUFS, with peaks kept under control so there's no clipping. The audio gains presence without distorting.
What you can do with it
- 01
Phone recordings
Voice notes, lectures or meetings recorded on a phone are often too quiet. 200 to 250% makes them audible.
- 02
Podcast episodes
Normalize each episode to -16 LUFS so listeners don't have to touch the volume when moving between them.
- 03
Even playlists
Songs from different albums play at very different volumes. Normalizing them avoids the jumps between tracks.
- 04
Video audio and old recordings
Audio extracted from a video or digitized from tapes and records often sounds weak next to modern audio.
How it works, in 3 steps
Upload the file
MP3, FLAC, WAV, AAC and OGG are supported: voice notes, podcasts, songs or audio you pulled from a video.
Choose the mode
Boost if you just want more level on one file: start at 150%. Normalize if you want a standard loudness or to match several files.
Check and download
Listen to the loudest parts: if they sound harsh, lower the percentage or switch to Normalize. Then download as MP3, WAV, FLAC or OGG.
The two modes, explained
150%
One and a half times louder. Enough for most recordings that are a bit quiet.
200%
Double the amplitude. Useful for clearly weak recordings.
300%
Triple. Only for very quiet audio: on files with high peaks it will distort.
Normalize to -16 LUFS
Measures the loudness of the whole file, works out the gain needed to reach -16 LUFS and keeps peaks in check.
Peak versus loudness
The peak is the single loudest instant of the signal; LUFS measures how loud the whole thing sounds, which is what the ear perceives.
What clipping is
When the amplified signal goes past 0 dBFS it gets cut off and sounds harsh and crackly. It's the risk of boosting too much.
Tips for better results
- Start at 150% and go higher only if needed: most quiet recordings are fixed between 150 and 200%.
- If the file already has peaks near -3 dB, don't boost by percentage: normalize it.
- For a podcast series, normalize every episode and they'll match each other.
- If the recording has background noise, clean it first with Noise Remover: when the volume goes up, so does the noise.
Frequently asked questions
What's the difference between Boost and Normalize?
Boost multiplies the signal by the percentage you choose: direct, but it can clip if you overdo it. Normalize analyzes the file and brings it to a fixed loudness of -16 LUFS while controlling peaks, so it's safer and leaves several files matched.
What are LUFS?
A measure of perceived loudness across the whole audio, not just its highest point. It's the reference streaming platforms, podcasts and broadcasters use so everything plays at a similar volume.
Why -16 LUFS?
It's a common target for podcasts and streaming content: present without straining the mix, and it fits most platforms well.
Does boosting the volume cause distortion?
It can if the original was already loud: peaks go past the maximum and get cut off. With moderate boosts, or in Normalize mode, the risk is much lower.
Can I match the volume of several files?
Yes. Run each one through Normalize: they'll all end up at -16 LUFS and sound alike, ideal for episodes, audiobook chapters or playlists.