Convert AU to AMR
Convert AU files to AMR format online for free. No upload required, 100% private.
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AUAMRSize Reduction
Converting from AU (Uncompressed) to AMR (lossy) will significantly reduce file size. Some audio quality will be lost, but the difference is often imperceptible at higher bitrates.
About AU
AU
Sun Microsystems Audio
AU is a simple audio format originally developed by Sun Microsystems for Unix systems. It supports both compressed and uncompressed audio.
Extension
.au
Developed By
Sun Microsystems
Released
1980s
Compression
UncompressedTypical Use Cases
Unix/Linux systemsLegacy applicationsSimple audio storage
Pros
- • Simple format
- • Unix native
- • Lightweight
Cons
- • Outdated
- • Limited features
- • Poor cross-platform support
About AMR
AMR
Adaptive Multi-Rate Audio Codec
AMR is a speech audio codec optimized for voice recording. It is commonly used in mobile phones for voice memos and MMS messages.
Extension
.amr
Developed By
ETSI
Released
1999
Compression
LossyTypical Use Cases
Voice recordingMobile phone audioMMS messagesVoIP
Pros
- • Very small file size
- • Optimized for speech
- • Mobile device support
Cons
- • Poor music quality
- • Speech only
- • Limited compatibility