Audio Volume
Boost or reduce volume 0.25x-4x with optional fades and format conversion
Drag & drop files here
or browse files
Adjust volume of MP3 / WAV / M4A / OGG / FLAC audio
About this tool
A recorder placed across the table captures a whisper, an audio track pulled from video sits a notch below everything else, an exported voice note is barely audible - none of that is fixed by finding another file; the waveform just needs scaling. This tool adjusts volume by a multiplier: 0.5x halves it, 2x doubles it, anything between 0.25x and 4x works, and you can audition the result before downloading.
Beyond plain gain there is optional fade in and fade out with free-form durations - handy for ringtones and podcast intros. The output format can be converted in the same pass (MP3 / WAV / M4A / OGG / FLAC), so "adjust volume" and "change format" finish as one job.
The adjustment runs on FFmpeg compiled to WebAssembly inside your browser, and nothing is uploaded. Multiplying a waveform has a hard ceiling: pushing gain too far flattens the peaks into distortion, so start from 1.5x.
Features
- Free gain from 0.25x to 4x, with 50% / 150% / 200% / 300% presets
- Optional fade in and fade out with free durations (0 disables)
- Format conversion in the same pass, bitrate selectable
- Audition before download; iterate as often as needed
- Fully local processing with live progress
How to use
- Drop the audio file - duration and codec are read
- Choose the gain (or type a custom value) and set fades if wanted
- Pick the output format (keep the original by default) and click Apply
- Audition the result and download
Frequently asked questions
- How much gain is safe?
- Let your ears decide - most quiet recordings need 1.5x-2x. If boosting introduces crackling, the peaks are being clipped; back off to 1.5x or handle the file in a dedicated audio editor with a compressor. Note that gain also amplifies background noise - it cannot make a noisy recording clean.
- Can it normalise several recordings to the same loudness?
- This tool applies fixed-ratio gain, not loudness normalisation. To align several recordings, estimate the difference by ear and process each with its own factor. A proper loudness-normalisation mode may come later.
- Why does boosted audio sound broken?
- Digital waveforms have a 0 dB ceiling; anything pushed above it gets flattened, which sounds like harsh distortion. Lower the gain to avoid it. If you need headroom for further processing, export WAV and continue in a professional editor.