Free online WMA to AC3 converter

A DVD-authoring application, set-top box, or video editor may require Dolby Digital audio and reject a .wma file. Converting the audio to AC3 creates a Dolby Digital bitstream suitable for DVD, broadcast, and some video-container workflows.

What WMA is

WMA (Windows Media Audio) is a Microsoft audio codec family used in Windows Media Player libraries, older Windows encoding tools, voice recorders, and Microsoft-centric media collections. Most .wma files contain lossy stereo audio, but WMA Lossless, WMA Pro, and WMA Voice are separate variants with different quality and compatibility characteristics.

Many non-Windows devices and applications have limited WMA support, especially for WMA Pro, WMA Lossless, or DRM-protected files. Protected WMA files generally cannot be converted unless the playback rights permit decoding.

What AC3 is

AC3, also called Dolby Digital or AC-3, is a lossy audio codec used on DVDs, digital television, AV receivers, and video files. A file with the .ac3 extension normally contains a raw AC-3 audio stream; AC-3 audio can also be placed in containers such as .mkv, .vob, and, where supported, .mp4.

AC3 supports mono, stereo, and surround layouts up to 5.1 channels at bitrates from 32 to 640 kbit/s. Its main advantage is compatibility with systems that specifically expect Dolby Digital; it is not automatically a better choice than AAC for web video or modern mobile devices.

Convert the file

On 101convert.com, upload the .wma file, choose AC3 as the output format, start the conversion, and download the resulting .ac3 file. This converts the audio stream only; if the destination needs audio inside a video file, use the required container and mux the AC3 stream with the video.

For local or batch conversion, FFmpeg provides explicit control over bitrate, channels, and sample rate. For typical stereo output, run:

ffmpeg -i input.wma -c:a ac3 -b:a 192k output.ac3

Use 256k when the target permits a larger stereo file and you want less additional compression. DVD projects normally require 48 kHz audio, so use:

ffmpeg -i input.wma -c:a ac3 -ar 48000 -b:a 192k output.ac3

For a genuine 5.1-channel source, retain its channel layout and use a higher bitrate such as 448 kbit/s:

ffmpeg -i input.wma -c:a ac3 -ar 48000 -b:a 448k output.ac3

To add converted audio to an existing video while copying the video unchanged, use a container that supports AC3 reliably, such as Matroska:

ffmpeg -i input.wma -i video.mp4 -map 1:v:0 -map 0:a:0 -c:v copy -c:a ac3 -b:a 192k output.mkv

Quality and compatibility limits

Converting lossy WMA to AC3 is lossy-to-lossy transcoding; it cannot recover detail removed by the original WMA encoder. Keep the original WMA and, when available, the uncompressed source for editing or future exports.

Do not force a stereo source to six channels with settings such as -ac 6. Duplicated channels do not create real surround audio and may make the output less compatible.

Check the target requirements before converting a collection: raw .ac3 files are not accepted everywhere, DVD tools may require 48 kHz audio, and some players or sharing platforms require AAC in an MP4 container instead. Match the required container, channel count, sample rate, and bitrate to the destination.