Left and right control
Free Online Stereo Balance
Adjust the left and right balance of a stereo file when one side feels too strong or you want the image to lean in one direction. The processing happens locally in the browser with FFmpeg.
Useful for private interview captures, music stems, and podcast drafts because the source audio stays on your device.
Uses FFmpeg pan filtering to rebalance the stereo channels with predictable left and right attenuation.
A focused way to fix uneven stereo playback without opening a multi-track editor.
Drag & drop audio here, or click to upload
Supports MP3, WAV, M4A, FLAC, OGG, AAC, and more
How to use the Stereo Balance online
- 1.Upload an audio file and let the browser read its duration and sample rate.
- 2.Move the balance control left or right until the stereo image feels more even or intentionally off-center.
- 3.Choose MP3 or WAV export, process the file in the browser, preview the result, and download it.
Why use this Stereo Balance?
Fix uneven stereo recordings
Correct small channel imbalances in interviews, live captures, music stems, or draft mixes.
Private browser workflow
FFmpeg runs locally on your device, so source files stay off external servers during processing.
Flexible output
Export MP3 for quick sharing or WAV if you want to keep editing the result afterward.
Common use cases
- •Correct an interview capture where one side feels louder than the other.
- •Push a stereo ambience bed slightly left or right for scene placement.
- •Tame imbalance in a rough music export before sending it out for review.
- •Prepare a more comfortable headphone version of a stereo file.
Tips for better results
- •Start with small moves such as 10% to 25% before making stronger changes.
- •This page is meant for stereo files. Mono uploads cannot be rebalanced left versus right.
- •If the file also needs width changes, balance first and then adjust stereo width.
Stereo Balance FAQ
Will this create surround sound or moving pan automation?
No. It applies a fixed left-right rebalance to the whole file rather than timeline-based panning.
Is my audio uploaded to a server?
No. The processing happens in your browser, so the source file stays on your device.
Which formats can I upload?
Most common browser-decodable formats are supported, including MP3, WAV, M4A, FLAC, OGG, and many AAC-based files.
When should I export WAV instead of MP3?
Choose WAV if you plan to keep editing or chain more processing afterward. MP3 is better for quick sharing and review.