Audio → 5.1 Surround Tool
Auto-detects stereo or native 5.1 · Per-channel leveling · 16-bit 6-ch WAV export
This is an independent browser-based surround upmixer. The browser preview is a stereo downmix of up to the first 60 seconds of the processed six channels; the downloaded WAV contains the real 5.1 channel layout.
Drop stereo or 5.1 audio file or click to upload
MP3, WAV, OGG, AAC, FLAC, M4A — mono and stereo files are upmixed; exactly 6-channel files are preserved. Maximum 100 MB and 10 minutes.
Recommended: upload short 15–60 second parts. Long audio creates a very large uncompressed 5.1 WAV and can use substantial browser memory.
Smart Center uses stereo coherence to focus common vocals and dialogue. Rear Space uses independent all-pass and multi-tap phase networks for wider, less identical surround channels.
Exports a real 6-channel 16-bit PCM WAV (FL, FR, FC, LFE, RL, RR — standard 5.1 order). Native 5.1 uploads are preserved; stereo uploads are upmixed. Compatible with VLC, DaVinci Resolve, Adobe Premiere, Audacity, and most DAWs. WAV is uncompressed, so it can be much larger than MP3. A final soft limiter and exact -1.5 dBFS safety ceiling are applied before WAV encoding to prevent clipped samples.
Estimated download size: Upload a file to calculate size