Free online OPUS to W64 converter

Brief explanation of the source format

OPUS is a compressed audio format based on the Opus codec, designed for efficient speech and music encoding at low to medium bitrates. It is widely used in VoIP, streaming, online meetings, gaming voice chat, and web audio because it offers very good quality with small file sizes and low latency. OPUS files are commonly found in containers such as .opus or .ogg, and they are often used when bandwidth efficiency matters.

Brief explanation of the target format

W64 is a Wave64 audio container format developed by Sony as an extension of WAV for very large files. It is mainly used in professional audio workflows where recordings can exceed the 4 GB limit of standard WAV. W64 supports large uncompressed audio files and is useful for editing, archiving, and post-production when compatibility with large PCM audio files is needed.

How to perform the conversion

The most practical way to convert OPUS to W64 is with FFmpeg, which can decode Opus audio and write Wave64 output directly.

1. Install FFmpeg on your computer if it is not already available.
2. Open a terminal or command prompt in the folder containing your OPUS file.
3. Run a command like ffmpeg -i input.opus output.w64.
4. If you want to preserve the audio as uncompressed PCM, FFmpeg will usually choose a suitable default for W64 output. You can also specify the sample format explicitly, for example ffmpeg -i input.opus -c:a pcm_s24le output.w64 for 24-bit PCM, if supported by the source and your workflow.
5. Check the resulting file in an audio editor or player that supports Wave64.

If you prefer a graphical workflow, you can use desktop audio tools that support export to Wave64, but support is less common than for WAV. In many cases, converting first to a standard PCM format and then saving as W64 is unnecessary because FFmpeg can write W64 directly.

You can also convert the file on 101convert.com for free, without installing any software.

Notes on quality, compatibility, or limitations

OPUS is lossy, so the conversion to W64 cannot restore audio detail that was already discarded during Opus compression. The output W64 file will typically be much larger than the source because W64 is usually used for uncompressed PCM audio.

Compatibility is the main limitation: W64 is not as widely supported as WAV. Some consumer players and editors may not open it, while professional audio software usually handles it better. If broad compatibility is more important than large-file support, standard WAV may be a safer target than W64.

Also note that if the source OPUS file contains metadata, chapters, or multiple streams, not all of that information may carry over cleanly into W64, since Wave64 is primarily an audio container for PCM data.