Convert WMA to 3GP — Free Online Converter

WMA (Windows Media Audio) is Microsoft's proprietary audio codec family, introduced in 1999 as part of the Windows Media framework. WMA Standard provides lossy compression competitive with MP3, while WMA Pro supports multichannel surround and WMA Lossless offers bit-perfect compression. 3GP is a lightweight multimedia container created by the 3rd Generation Partnership Project for mobile phones on 3G networks.

Converting WMA to 3GP re-encodes the audio into a mobile-friendly container using AMR or low-bitrate AAC codecs. This bridges the Windows Media ecosystem with legacy mobile infrastructure, enabling playback on older feature phones and compatibility with MMS messaging gateways.

WMA files are a Windows ecosystem format with no native support on most feature phones. Legacy Nokia, Samsung, and LG handsets expect 3GP for audio playback, and MMS gateways typically accept only 3GP, AMR, or WAV (which is too large for MMS). Converting WMA to 3GP makes your Windows-sourced audio accessible to these devices.

The conversion also achieves dramatic file size reduction. A WMA file at 128 kbps becomes even smaller when re-encoded to AMR-NB (12.2 kbps), suitable for mass storage of voice recordings or delivery through bandwidth-constrained mobile channels.

FFmpeg decodes the WMA stream (wmav1 or wmav2 codec) to PCM, then re-encodes to AMR-NB (8 kHz mono, 4.75-12.2 kbps), AMR-WB (16 kHz mono, 6.6-23.85 kbps), or AAC-LC within a 3GP container. The WMA decoder handles both WMA Standard and WMA Pro profiles. Since both source and target are lossy compressed formats, this is a transcode operation with cumulative quality loss. The output conforms to the 3GPP TS 26.244 container specification.