Increase MP3 volume
Make quiet MP3s, voice memos, and recordings permanently louder — boosted on your device, ready to play anywhere.
Free · No signup · Files never leave your device
Drag and drop a quiet video or audio file
or click to browse
Adjustment
Applies a fixed gain — simple and predictable
Other volume fixes
How it works
Drop your file
It stays on your device — nothing is uploaded.
Adjusted locally
The volume is measured and adjusted right in your browser via WebAssembly.
Download the result
Compare before and after, then download for free — no watermark.
Quiet MP3s, evened out
Old rips, voice memos, downloaded lectures, and files from different sources all sit at wildly different volumes — one track whispers, the next one shouts. A fixed decibel boost fixes a single quiet file; loudness normalization brings a whole folder of mismatched files to the same standard level, the way streaming services do it.
Everything runs locally in your browser: no upload queue, no file size anxiety, and your recordings never leave your device.
Frequently asked questions
The audio is re-encoded once at a high bitrate (192 kbps), which is indistinguishable for speech and nearly all music. What can hurt quality is boosting too far — if loud moments begin to distort, use Normalize mode, which measures the file first and applies a safe gain.
WAV, M4A, AAC, FLAC, OGG, and most other common formats. MP3 and WAV files keep their format; others are saved as M4A. Video files work too — only their audio track is changed.
Yes — that is exactly what Normalize mode is for. Run each file through with the same LUFS target (-16 LUFS is a good default for spoken audio) and they will all match, instead of each getting the same blind boost.
Yes. The volume booster is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.
No. The volume adjustment happens locally in your browser using WebAssembly. Your file never leaves your device — you can even disconnect from the internet once the page has loaded.