Free online W64 to AAC converter

Source format: W64

W64 is a Wave64 audio file format developed by Sony for storing uncompressed PCM audio. It is similar to standard WAV, but it uses a different container structure that supports very large files beyond the 4 GB limit of classic RIFF/WAV. W64 is used mainly in professional audio production, recording, editing, and archiving when long recordings or high-resolution audio need to be preserved without compression.

Target format: AAC

AAC (Advanced Audio Coding) is a compressed lossy audio format designed to deliver good sound quality at relatively small file sizes. It is widely supported by phones, media players, streaming platforms, and editing software. AAC is commonly used for music distribution, podcasts, mobile playback, and web audio because it offers a strong balance of quality and compression.

How to perform the conversion

The most reliable way to convert W64 to AAC is with FFmpeg, which can read Wave64 files and encode AAC directly.

1. Install FFmpeg on your computer.
2. Open a terminal or command prompt in the folder containing your .w64 file.
3. Run a command such as ffmpeg -i input.w64 -c:a aac -b:a 192k output.aac.
4. If you want a different quality level, adjust the bitrate, for example -b:a 256k for higher quality or -b:a 128k for smaller files.
5. Check the resulting .aac file in a compatible player or editor.

If you prefer a simpler workflow, you can also convert the file on the 101convert.com website for free, without installing any software.

In some audio editors, the process is similar: open the W64 file, then choose File → Export or File → Save as, and select AAC if the program supports AAC export directly.

Notes on quality, compatibility, and limitations

W64 is uncompressed, so converting it to AAC will always involve lossy compression. That means some audio detail is discarded to reduce file size. For speech or casual listening, AAC is usually excellent; for archiving or further editing, keep the original W64 file as well.

Because AAC is a compressed format, the output quality depends on the chosen bitrate and encoder settings. Higher bitrates generally preserve more detail but create larger files. Also note that some software labels AAC files as .m4a rather than .aac; both can contain AAC audio, but .m4a is often more broadly compatible in consumer devices.

If your source W64 file contains multiple channels or very high sample rates, make sure the target player supports those AAC settings. In most cases, standard stereo AAC at 128–256 kbps offers the best compatibility.