Convert WMV to AMR — Free Online Converter
Convert Windows Media Video (.wmv) to Adaptive Multi-Rate Audio (.amr) online for free. Fast, secure video conversion with no watermarks or registration.
Conversion settings — add a file to adjust
About WMV to AMR Conversion
WMV files carry WMA audio in Microsoft's ASF container, while AMR (Adaptive Multi-Rate) is a narrowband speech codec developed by ETSI for GSM cellular networks. AMR operates at 8 kHz with bitrates from 4.75 to 12.2 kbps, using algebraic CELP encoding optimized exclusively for human voice. Converting WMV to AMR extracts the audio, downsamples to 8 kHz mono, and encodes it for the most extreme voice compression available — producing files under 6 MB per hour of speech.
Why Convert WMV to AMR?
AMR's sole purpose is ultra-compact voice encoding for mobile telephony. If you have WMV recordings of meetings, depositions, interviews, or phone calls and need the absolute smallest possible audio files for MMS delivery, legacy mobile voice memo systems, or VoIP archival, AMR achieves compression ratios that no other format can match for speech content.
Common Use Cases
- Extracting speech from WMV meeting recordings for MMS distribution to field workers
- Creating ultra-compact voice files from WMV interview recordings for mobile archival