Adjust Audio Volume
Processed locally in your browser — nothing is uploaded.
Quick answer
To adjust audio volume you apply a gain, measured in decibels: a positive dB value makes it louder, a negative value quieter. Because decibels are logarithmic, roughly every +6 dB doubles perceived loudness and −6 dB halves it. This tool applies your chosen gain to the whole file in your browser, with nothing uploaded, and warns you before a boost would clip. First use downloads the ~32 MB engine once, then caches it.
How to adjust audio volume
Load the file
Drop in the audio you want louder or quieter. Its current level is analysed so the tool can warn about clipping.
Set the gain in dB
Enter a positive value to boost or a negative value to reduce. A clipping warning appears if a boost would push peaks past the ceiling.
Apply and download
Export the adjusted file and download it at the new level.
Why is volume measured in decibels?
Human hearing is logarithmic — we perceive ratios, not absolute steps — so audio gain uses decibels, a logarithmic unit, to match. The practical rules of thumb are worth memorising: +6 dB is about twice as loud, −6 dB about half. A +3 dB nudge is a clearly audible lift; +10 dB is a big shove. This is why a small dB number can make a large difference, and why you rarely need more than a handful of decibels to fix a recording.
| Gain | Effect | Typical use |
|---|---|---|
| +6 dB | ≈ twice as loud | A recording that is too quiet |
| +3 dB | Clearly louder | A gentle lift |
| 0 dB | No change | Reference / unity |
| −3 dB | Clearly quieter | Taming a hot track |
| −6 dB | ≈ half as loud | A recording that is too loud |
What is clipping and how do you avoid it?
Digital audio has a hard ceiling at 0 dBFS. If a boost pushes the loudest peaks above it, they are flattened against that ceiling — that is clipping, and it sounds like harsh, crackly distortion that cannot be undone. This tool measures your file’s existing peak and warns you when your requested gain would cross the ceiling, so you can back off before you bake distortion in.
When to adjust gain versus normalize?
Adjusting gain is a manual, blunt instrument — you decide the exact dB and it applies everywhere equally. That is perfect when you know precisely what you want ("this is 4 dB too quiet"). Normalizing is automatic — you name a target loudness and the tool works out the gain for you. Reach for gain when you are in control of the number, and normalize when you want a consistent result across many files.
There is a quality dimension too, and it is reassuring. Applying gain in the digital domain is a clean multiply: it adds no noise when you turn a file down, and none when you turn it up until the moment peaks hit the ceiling. The only audible cost ever comes from clipping at the top, never from the gain operation itself — which is exactly why a modest, well-judged boost is completely transparent and why the clipping warning is the one thing worth respecting.
Is the file uploaded to change its volume?
No. The gain is applied by ffmpeg.wasm in your browser; the file is read, scaled and returned locally with no network request. Check it yourself in DevTools → Network — adjusting the volume sends nothing. Private interviews and unreleased mixes stay on your device.
Related audio and video tools
For a consistent target across a whole library, use normalize audio. To ease the very start and end rather than the whole level, add a fade in and out. Compressing after boosting? Do it with compress audio. And if the loud or quiet track lives inside a movie, extract the audio from the video first, then adjust it here.
Your files never leave your device
Processed locally in your browser — nothing is uploaded. You can verify it yourself: open your browser’s developer tools, watch the Network tab, and use the tool — no upload request is ever made.
Frequently asked questions
How many dB should I add to make audio noticeably louder?
About +6 dB roughly doubles perceived loudness. +3 dB is a clear but gentle lift. Small numbers go a long way because decibels are logarithmic.
What does the clipping warning mean?
It means your boost would push the loudest peaks past 0 dBFS, causing distortion. Reduce the gain until the warning clears, or use normalize instead.
Can I make a very quiet recording much louder?
You can boost until the peaks reach the ceiling. Beyond that, straight gain clips — normalize is the safer tool for large loudness increases.
Is +6 dB really twice as loud?
It is about twice as loud in perceived terms. Decibels are logarithmic, so each +6 dB is roughly a doubling and each −6 dB a halving.
Does reducing volume harm quality?
No. Turning a file down never clips and does not distort. Only boosting past the ceiling causes damage.
Can I use a percentage instead of decibels?
The tool accepts a level change either way, but decibels are the more predictable unit because they match how loudness is perceived.
Is anything uploaded?
No. The volume change happens locally via WebAssembly. You can confirm no upload occurs in your browser’s Network tab.