Free Online 3D Audio Enhancer
Widen the stereo image so the soundstage feels bigger and deeper.
What is this tool
AudioToolKit adds a 3D effect to audio files online for free, right in your browser. A short inter-channel delay widens the stereo image so music and films feel bigger and deeper, without changing pitch, tempo or loudness. The file never leaves your device, and you can export the widened track as MP3 for sharing or WAV for lossless quality.
Drag and drop your files here
or
MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, AIF, OPUS, WMA, AMR — up to 25 MB per file
Output
Widened MP3 or WAV
Accepted formats
.mp3, .wav, .m4a, .aac, .ogg, .flac, .aiff, .aif, .opus, .wma, .amr
Why use this free tool
A narrow mix sits behind the speakers; a wide one surrounds you. The 3D enhancer applies a short inter-channel delay to lift the soundstage, making music and films feel more immersive without changing pitch or tempo.
How does the free 3d audio work?
- 1
Drop the audio file you want to widen.
- 2
Press Process and wait for the effect to render.
- 3
Download the widened track as MP3 or WAV.
Frequently asked questions
Does 3D audio change the pitch?
No. Only the stereo image is widened; pitch, tempo and loudness stay the same.
Is my file uploaded to a server?
No. The effect renders entirely in your browser, so the file never leaves your device.
What formats can I export?
MP3 for sharing and WAV if you want a lossless file.
Related tools
More answers in the Help Center.