Free online AC3 to W64 converter

Source format

AC3 is the file extension for Dolby Digital Audio, a compressed surround-sound format commonly found on DVDs, Blu-ray discs, broadcast media, and video files. It is widely used by home theater systems, media players, and video editing workflows because it supports multichannel audio, including 5.1-channel sound. AC3 is designed for efficient delivery, so it keeps file sizes relatively small while preserving compatibility with many playback devices.

Target format

W64 is a Wave64 audio container format developed by Sony as an extension of the standard WAV format. Its main advantage is support for very large audio files beyond the 4 GB limit of classic WAV, making it useful for long recordings, high-resolution audio, and professional editing. W64 is typically used in audio production, archiving, and workflows where uncompressed PCM audio is preferred for editing and preservation.

How to perform the conversion

The most reliable way to convert AC3 to W64 is with FFmpeg, a free command-line tool that supports both formats. Because AC3 is compressed and W64 usually stores uncompressed PCM audio, the conversion is typically a decode-and-rewrap process into PCM audio inside a W64 container.

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt.
3. Run a command such as ffmpeg -i input.ac3 -c:a pcm_s24le output.w64.
4. If you want standard 16-bit PCM instead, use ffmpeg -i input.ac3 -c:a pcm_s16le output.w64.
5. Check the resulting file in an audio editor or player that supports W64.

If you prefer a graphical workflow, Audacity can open AC3 files through FFmpeg support and export to formats such as WAV-family audio, though direct W64 export support may depend on the version and installed libraries. In many cases, FFmpeg remains the best choice for a straightforward and dependable conversion. You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality and compatibility

Converting AC3 to W64 does not improve audio quality; it only changes the format. Since AC3 is lossy, the original compression artifacts remain after conversion. The main benefit is that the audio becomes easier to edit in a professional, uncompressed container. Keep in mind that W64 support is less universal than WAV, so some consumer players and devices may not open it. If broad compatibility is more important than large-file support, standard WAV may be a better choice. For archival or editing purposes, however, W64 is a strong option when file size or duration would exceed WAV limits.