Change Audio/Video Volume
Upload an audio or video file and adjust its volume with a slider — processed locally.
Quick Presets
All processing happens in your browser — your files are never uploaded.
How to use Change Audio/Video Volume
The Change Volume tool lets you amplify or reduce the audio level of an MP4, WebM, MOV, MP3 or WAV file by a precise decibel amount or a percentage multiplier — processed entirely in your browser with no file uploads. Use it to boost a quiet recording, normalize clipped audio, balance the loudness of clips before merging, or duck music under a voiceover.
- Click "Select File" and open your video or audio file.
- Choose the adjustment method: decibel change (e.g. +6 dB or −10 dB) or percentage multiplier (e.g. 150%).
- Enable "Normalize" to automatically set the peak level to the target loudness without clipping.
- Preview the adjusted audio using the built-in player to confirm the level is correct.
- Click Apply and download the volume-adjusted file.
Your data never leaves your device — 100% private processing.
Decibels vs percentage volume adjustment
Decibels (dB) are the standard unit for audio level changes because human hearing is logarithmic. A +6 dB boost approximately doubles the perceived loudness; −6 dB halves it. Percentage adjustment is linear and more intuitive for non-technical users: 200% doubles the amplitude, 50% halves it. Both modes apply the same underlying gain operation; dB is preferred for broadcast and professional work because most metering, standards and specifications (EBU R128, ATSC A/85) are defined in dB.
| Adjustment | Effect on loudness |
|---|---|
| +6 dB | Approximately doubles perceived loudness |
| +3 dB | Noticeable increase, about 40% louder |
| 0 dB | No change |
| −6 dB | Approximately halves perceived loudness |
| −20 dB | Significantly quieter, good for background music |
Normalisation and loudness standards
Normalization sets the peak or integrated loudness of an audio file to a target level. Peak normalization ensures no sample exceeds 0 dBFS (the digital ceiling) to prevent clipping. Loudness normalization targets an integrated loudness value measured in LUFS (Loudness Units relative to Full Scale) — streaming platforms like Spotify target −14 LUFS, YouTube targets −14 LUFS and broadcast standards vary between −23 and −24 LUFS. Use loudness normalization when preparing content for a specific platform to avoid the platform silently adjusting your levels.
Glossary
- Decibel (dB)
- A logarithmic unit for measuring sound level or signal amplitude; a +6 dB increase roughly doubles perceived loudness.
- dBFS
- Decibels relative to Full Scale; 0 dBFS is the maximum digital level; values above 0 dBFS cause clipping distortion.
- LUFS
- Loudness Units relative to Full Scale; an integrated loudness measurement standard used by streaming platforms and broadcast specifications.
- Clipping
- Distortion caused when an audio signal exceeds the maximum digital level (0 dBFS), producing a harsh, crackling sound.
- Gain
- A multiplier applied to an audio signal that increases or decreases its amplitude; a gain of 2× is approximately +6 dB.
Related reading
Frequently Asked Questions
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Why use Change Audio/Video Volume?
- Powered by FFmpeg running directly in the browser — no upload needed
- Supports all major video and audio formats
- Lossless and lossy options for quality control
- Export results immediately without waiting for cloud processing
Common use cases
- Compress a video before uploading to Google Drive
- Extract audio from a video lecture for easy listening
- Trim a video clip for a social media reel
- Convert MOV files to MP4 for cross-platform compatibility
- Merge two audio tracks for a podcast episode
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