Audio
Adjust Volume
Make audio louder or quieter, or normalize loudness automatically — entirely in your browser. Drop one file or a whole batch and apply the same change to all of them.
This tool runs FFmpeg directly in your browser using WebAssembly — there is no server, no account, and no upload. Your audio file is read from your disk, its volume adjusted in a background thread, and the result is ready to download immediately. Nothing is ever sent over the network — you can confirm this yourself by watching the Network tab in your browser's developer tools while processing runs.
Choose “Adjust manually” to set an exact gain from -20dB to +20dB, or “Normalize” to automatically even out loudness to -16 LUFS, a common streaming target — no guessing at a number required. Need to level a whole folder of recordings? Drop them all in at once — every file gets the same treatment, downloadable individually or as a single ZIP.
How to Use
- 1
Drop one or more audio files onto the uploader or click to browse.
- 2
Choose "Adjust manually" and drag the dB slider, or choose "Normalize" for automatic loudness leveling.
- 3
Choose your output format.
- 4
Click the action button. Download the result, or for a batch, download each file individually or as a ZIP.
Frequently Asked Questions
Is my audio uploaded to a server?
No. Processing runs entirely in your browser using FFmpeg compiled to WebAssembly. Your audio never leaves your device — verifiable in your browser's Network tab during a run.
Manual gain vs. Normalize — what's the difference?
Manual gain applies a fixed dB change you choose. Normalize automatically levels loudness to -16 LUFS, a common streaming target — good when you just want it "louder" or "even" without picking a number.
Can boosting volume cause distortion?
Yes, pushing gain far above what the recording can handle can clip and distort, same as any volume boost. Normalize is the safer default since it targets a level rather than blindly amplifying.
What output formats are supported?
MP3, WAV, M4A, AAC, OGG, and FLAC — the same encoding as the Audio Converter.
Can I adjust the volume of multiple files at once?
Yes — this is a bulk volume booster. Drop several files in one batch; the same gain or normalize settings apply to all of them, downloadable individually or as a ZIP.