Stereo image shaping
Free Online Stereo Widener
Adjust stereo width for ambience, music beds, field recordings, and wide reference mixes. Narrow the image toward mono or push it wider, then preview and export locally.
Useful for private mixes, ambience recordings, and unreleased music because processing stays on your device.
Uses FFmpeg extra stereo processing to narrow or widen the stereo field with a single control.
A fast way to test mono-compatible versus wide playback without opening a larger stereo imaging tool.
Drag & drop audio here, or click to upload
Supports MP3, WAV, M4A, FLAC, OGG, AAC, and more
How to use the Stereo Widener online
- 1.Upload an audio file and let the browser read its duration and sample rate.
- 2.Choose how narrow or wide the stereo field should feel, then preview the result before export.
- 3.Choose MP3 or WAV export, process the file in the browser, preview the result, and download it.
Why use this Stereo Widener?
Useful for ambience and music beds
Stereo width control is handy when a file feels too narrow, too wide, or needs a faster mono-compatible version.
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
- •Widen an ambience bed for a more immersive headphone feel.
- •Narrow a music bed so voiceover can sit more comfortably in the center.
- •Check a near-mono version of a stereo recording before delivery.
- •Create alternate wide and narrow exports for different playback contexts.
Tips for better results
- •100% keeps the original image, so work outward from there instead of jumping straight to extreme values.
- •Very wide settings can introduce phasey playback, especially on speakers.
- •Use WAV if you plan to do more mastering or stereo work afterward.
Stereo Widener FAQ
What does 0% width do?
It narrows the stereo image heavily toward mono, which can be useful for compatibility checks or tighter center focus.
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.