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Convert AAC to SPX
Convert AAC to SPX format — 100% browser-based, no upload required.
2 cores · low tier
Drop a file here or click to select
Format will be auto-detected
About these formats
Source
AAC
Advanced Audio CodingSuccessor to MP3 with better quality at lower bitrates. Default audio for Apple devices, YouTube, and most streaming services.
Best for
StreamingApple devicesMobile audioYouTube
Advantages
- + Better than MP3 per bitrate
- + Streaming optimized
- + Apple/YouTube standard
Limitations
- − Patent-encumbered
- − Slightly less universal than MP3
Target
SPX
Speex AudioOpen-source speech codec designed for voice over IP. Provides good speech compression at very low bitrates.
Best for
VoIPVoice chatSpeech compressionPodcasts
Advantages
- + Optimized for speech
- + Open source
- + Very low bitrate
Limitations
- − Superseded by Opus
- − Speech only
- − Declining usage