How to change video volume in the browser
Upload your video
Load an MP4, MOV, or WebM with the audio track you want to adjust. The player previews the original so you can confirm it has the correct audio before proceeding.
Set the gain level
Choose a percentage gain value. Values above 100% increase loudness — for example, 200% doubles the amplitude. Values below 100% reduce it. Start with 150% for boosting quiet dialogue and 50% for reducing overpowering music beds.
Process locally
FFmpeg rebuilds the audio stream by applying the gain filter and then re-muxes it with the video stream. The resulting container has the same video quality as the source.
Preview the result
Scrub playback from different points in the clip. If you hear distortion or clipping, reduce the gain value and re-export from the original source file.
Download and archive
Save the adjusted MP4. Keep the original file separately — if a client requests a different level later, you can re-run the tool from the unprocessed source.
Common use cases
Interview and podcast cleanup
Guests seated far from the microphone arrive at barely audible levels. A moderate boost (150–200%) makes voices clear on phone speakers without distortion.
Gameplay and commentary balancing
Streamers and YouTubers often capture game audio much louder than commentary. Reducing the game audio channel lets the voiceover sit clearly in the mix before upload.
Marketing and ad spot levels
Agency editors deliver ad videos that need to match broadcast loudness guidelines. A quick level adjustment bridges the gap before platform submission.
Stock footage music beds
Lower an overpowering background music track under new narration so the dialogue is intelligible in the final marketing cut.
E-learning and classroom recordings
Students watching lecture recordings on laptop speakers hear quiet lecturers more clearly after a loudness boost, reducing listener fatigue during long sessions.
Social reels normalization
Creators who record on multiple devices find some clips much louder than others. Normalising clips to a consistent volume before combining them ensures an even viewing experience.
Best practices
- Increase in moderate steps — 150% is often enough for quiet voice recordings before distortion risk increases sharply.
- If audio clips harshly at a given gain value, reduce it rather than using a higher value and accepting the artefacts.
- Mute and replace audio entirely when the track is fundamentally unusable due to heavy background noise or hum.
- Combine with the Video Compressor after volume adjustment to keep the output file at a manageable size.
- Export the audio track separately via Video to MP3 if you need to apply level changes in an audio DAW for precise LUFS loudness normalization.
- Always work from the original source file for each adjustment pass — chaining volume changes across exports accumulates audio generation loss.
Formats & compatibility
Outputs MP4 with re-encoded audio (AAC) and H.264 video. Extreme gain values (above 400%) may introduce hard clipping if the source was already near peak levels. Works best on desktop Chrome and Edge with sufficient RAM for your file size. Mobile browsers are supported but process more slowly on large files.
Related tools
- Mute video — remove audio completely when the track is unusable
- Video compressor — reduce file size after correcting loudness
- Video trimmer — cut out sections with unusable audio before volume adjustment
Set your target volume above and download a balanced MP4 in minutes — no upload, no account.