Free Online Auto Panner
Sweep the sound left and right for a moving, animated feel.
What is this tool
AudioToolKit auto-pans audio online for free in your browser. An LFO sweeps the stereo image left and right at a speed and depth you set, creating the moving, animated feel behind 8D mixes. It works best on stereo files and full tracks, and the panned result downloads as MP3 or WAV. No upload — the effect renders entirely on your device.
Drag and drop your files here
or
MP3, WAV, M4A, AAC, OGG, FLAC, AIFF, AIF, OPUS, WMA, AMR — up to 25 MB per file
Higher sweeps faster. 0.25-0.5 suits most tracks.
0 = center, 1 = fully left and right.
Output
Auto-panned MP3 or WAV
Accepted formats
.mp3, .wav, .m4a, .aac, .ogg, .flac, .aiff, .aif, .opus, .wma, .amr
Why use this free tool
Auto-panning is the trick behind the circling, moving sound of 8D mixes. Set a sweep speed and depth, and the panner animates the stereo image for you — great on vocals, synths and full tracks.
How does the free auto panner work?
- 1
Upload the track you want to pan.
- 2
Set the sweep speed and depth, or leave the defaults.
- 3
Press Process and download the panned track.
Frequently asked questions
What do speed and depth control?
Speed is how many sweeps happen per second; depth is how far the sound travels toward each speaker. 0 keeps the center, 1 goes fully left and right.
Works on mono files?
Mono files have no stereo image to move, so the effect has no audible impact. Stereo files get the full sweep.
Is the file uploaded?
No — rendering happens in your browser.
Related tools
More answers in the Help Center.