Normalize & boost audio volume
Fix quiet recordings and uneven loudness in seconds. Runs entirely in your browser.
Free · No signup · Files never leave your device
Drag and drop a quiet video or audio file
or click to browse
Adjustment
Measures your audio, then evens it out to a standard loudness
Popular volume fixes
How it works
Drop your file
Any quiet or uneven video or audio file — it stays on your device.
Measured & adjusted locally
A two-pass loudness analysis runs right in your browser via WebAssembly. Nothing is uploaded.
Download the fixed file
Compare before and after side by side, then download for free.
Why recordings end up too quiet
Phone cameras, laptop microphones, and screen recorders all record with conservative input levels to avoid clipping — so the safe default is a file that plays back far quieter than the music and videos around it. Simply turning up playback volume also amplifies noise and still leaves the file itself quiet when you share it. Fixing the file once, at the source, is the real solution: this tool measures your audio's true loudness and raises it to a standard level, entirely on your device.
Two-pass loudness normalization, not just gain
The normalize mode runs the same EBU R128 two-pass process broadcasters use: a first pass measures integrated loudness, true peak, and loudness range; a second pass applies a precisely calculated linear gain so the result hits your target — -14 LUFS for Spotify/YouTube, -16 LUFS for podcasts, or -23 LUFS for broadcast delivery — without pumping or distortion. True-peak limiting at -1.5 dBTP keeps the loudest moments from clipping after the boost. If you just want everything a fixed amount louder, the boost mode applies a plain decibel gain instead.
Works on video without touching the picture
Drop in an MP4, MOV, or MKV and only the audio track is adjusted — the video stream is copied bit-for-bit, so there's no quality loss and no long re-encode. Audio files (MP3, WAV, M4A, FLAC...) work too. It pairs well with the noise remover: denoise first, then normalize, and a muffled phone recording turns into something you can publish.
Frequently asked questions
Boosting applies one fixed gain to everything — simple, but a +10 dB boost can push loud parts into distortion. Normalizing first measures your audio, then adjusts it to a standard loudness target (LUFS), so quiet recordings come up and already-loud ones are left sensible.
-14 LUFS matches what Spotify and YouTube normalize to, -16 LUFS is the common podcast recommendation, and -23 LUFS is the European broadcast standard. If unsure, -16 LUFS is a safe default for spoken content.
No — for video files only the audio track is adjusted and re-encoded. The video stream is copied untouched, so visual quality stays identical and processing is fast.
LUFS (Loudness Units relative to Full Scale) measures perceived loudness the way streaming platforms and broadcasters do — across the whole file, weighted for human hearing. It is the standard behind EBU R128 loudness normalization.
Yes. The volume normalizer is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.
No. All processing 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.