Free online AAC to W64 converter

Source format: aac

AAC (Advanced Audio Coding) is a compressed audio format designed to deliver good sound quality at relatively low file sizes. It is widely used in streaming media, mobile devices, digital music stores, and as an audio codec inside containers such as MP4/M4A. AAC is common for music, podcasts, and general-purpose audio distribution because it balances quality and compression efficiently.

Target format: w64

W64 is the Wave64 audio container format, an extension of WAV created by Sony. It is intended for very large audio files and supports file sizes beyond the 4 GB limit of standard WAV. W64 is typically used in professional audio workflows, recording, editing, and archiving where large uncompressed or high-resolution audio files must be handled reliably.

How to perform the conversion

The most practical way to convert AAC to W64 is with FFmpeg, a widely used command-line tool that supports both formats. Because AAC is compressed and W64 is usually used for uncompressed PCM audio, the conversion will typically decode AAC and write the audio into a W64 container as PCM.

1. Install FFmpeg on your computer if it is not already available.
2. Open a terminal or command prompt in the folder containing your AAC file.
3. Run a command such as ffmpeg -i input.aac output.w64.
4. If you want to control the audio format more explicitly, use PCM output, for example ffmpeg -i input.aac -c:a pcm_s16le output.w64.
5. Check the resulting file in an audio editor or player that supports W64.

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

Notes on quality and compatibility

AAC is lossy, so converting it to W64 does not restore lost audio detail; it only places the decoded audio into a larger, uncompressed container. The resulting W64 file will usually be much larger than the AAC source. This conversion is useful when you need an editable or archival PCM file, but it is not ideal if you want to preserve small file size.

Compatibility is another important factor: W64 support is more limited than WAV, especially in consumer players and basic editors. Before converting, make sure your target software can open W64 files. If broad compatibility is more important than large-file support, standard WAV may be a better choice.