Change Audio Volume
Pick an audio file and a gain — it's boosted or cut in your browser, nothing is uploaded.
Change audio volume in your browser
Pick an audio file and a gain amount — the volume is changed with ffmpeg, entirely in your browser. Work in decibels (+6 dB is roughly twice as loud-feeling, -6 dB cuts it back) or switch the unit to factor (2 doubles the amplitude, 0.5 halves it). A peak limiter is on by default so big boosts hit 0 dBFS and stop instead of clipping into distortion.
Worked example
A phone recording that's way too quiet: upload memo.m4a, leave Amount at
6 (dB) and Prevent clipping ticked — the result memo-volume.mp3 is
clearly louder with no crackle, because the limiter caps any peak that the
boost would have pushed past full scale. Still too quiet? Run it again, or use
12. Need an exact halving instead? Set Unit to factor and Amount
to 0.5.
Decibels or factor?
- db (default) — perceptual and additive: +6 then +6 equals +12. The range is ±60 dB; 0 is rejected since it wouldn't change anything.
- factor — exact linear scaling of the waveform: 2 doubles every sample value, 0.5 halves it. Accepted range is (0, 16].
Limits and edge cases
- Input files up to 10 MiB; any format ffmpeg can decode works.
- With the limiter ON, a large boost converges on "as loud as possible without clipping" rather than the literal gain — that's the point. Disable it (untick) if you need mathematically exact gain and accept clipping risk.
- Boosting can't add detail a very quiet, noisy recording never captured — the noise floor rises with the signal. For consistent loudness across a whole file, the audio-normalize tool (LUFS) is usually the better pick.
- Output is re-encoded (mp3/ogg at 192 kbps; wav/flac lossless; m4a AAC). Embedded album art is dropped.
FAQ
How many dB make it "twice as loud"?
Roughly +10 dB feels twice as loud to most listeners; +6 dB doubles the signal's amplitude. Try +6 first — it's a clearly audible boost — and repeat or use +12 if the source is very quiet.
Why does my boosted file top out instead of getting ever louder?
The clipping limiter caps peaks at 0 dBFS — digital audio physically can't go above full scale without distortion. Once peaks touch the ceiling, extra gain only raises the quiet parts. If everything already peaks near full scale, consider the audio-normalize tool to raise average loudness instead.
Should I use this or audio-normalize?
Use this tool for a simple fixed change ("make it 6 dB louder"). Use audio-normalize when you need a standard loudness target (Spotify -14 LUFS, podcast -16) or consistent volume across episodes — it measures your audio and applies exactly the gain needed.
Is my audio uploaded anywhere?
No. The page downloads an ffmpeg WebAssembly build once and then processes your file locally in the browser tab — the audio never leaves your device.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool audio-volume-adjust 'url=https://example.com/input' 'amount=6' 'unit=db' 'limiter=true' 'format=mp3'New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/audio-volume-adjust/?url=https://example.com/input&amount=6&unit=db&limiter=true&format=mp3