W64 Format Guide

Available Conversions

Convert to W64

About W64 Format

W64, also known as Sony Wave64, is an audio file format developed by Sony Creative Software (formerly Sonic Foundry) as an extension of the standard WAV format to overcome its 4 GB file size limitation. The format uses the .w64 file extension and was introduced alongside Sony's Sound Forge and Vegas Pro audio/video editing software. While the standard WAV format uses 32-bit RIFF chunk sizes, limiting files to approximately 4 GB, W64 replaces the RIFF structure with 64-bit GUID-based chunks that allow file sizes up to 16 exabytes (theoretically). This makes W64 essential for professional audio production scenarios where long multi-channel recordings at high sample rates and bit depths easily exceed the 4 GB WAV boundary. The format maintains full compatibility with WAV's audio encoding capabilities, supporting all PCM bit depths, floating-point audio, and the same range of sample rates, while simply extending the container to handle larger data payloads.

History of W64

The W64 format was created by Sonic Foundry, the original developer of Sound Forge, in the late 1990s as professional audio production increasingly demanded recordings that exceeded the 4 GB RIFF/WAV limit. As 24-bit/96 kHz recording became standard in professional studios, a stereo recording at this quality level would reach 4 GB in approximately 2 hours, and multi-channel surround recordings reached the limit even faster. Sonic Foundry designed Wave64 using GUIDs (Globally Unique Identifiers) instead of the traditional RIFF four-character chunk IDs, with all size fields extended to 64 bits. When Sony acquired Sonic Foundry's media software division in 2003, the format became associated with Sony's product line, particularly Sony Vegas Pro and Sound Forge Pro. The format specification was documented and made freely available, allowing other audio software to implement W64 support. While Microsoft later introduced the RF64/BWF64 format to address the same 4 GB limitation in a standardized way, W64 had already established itself in the Sony ecosystem and continues to be widely supported. Today, W64 is recognized by most professional audio software including Audacity, Adobe Audition, Reaper, FFmpeg, and libsndfile, ensuring broad interoperability in professional audio workflows.

Key Features and Uses

W64's primary feature is its ability to store audio files larger than 4 GB while maintaining the simplicity and audio quality of the WAV format. The format supports all standard PCM encodings including 8-bit unsigned, 16-bit, 24-bit, and 32-bit signed integer, as well as 32-bit and 64-bit IEEE floating-point audio. Sample rates from 8 kHz to 384 kHz and beyond are supported, accommodating everything from telephone-quality voice to ultra-high-resolution audio. Multi-channel configurations are fully supported, making W64 ideal for surround sound production (5.1, 7.1, and beyond) where the combination of multiple channels and high sample rates quickly generates files exceeding 4 GB. The GUID-based chunk structure provides a more robust identification system than RIFF's four-character codes, reducing the risk of chunk type collisions. W64 preserves WAV's straightforward linear data layout, which enables efficient random access and editing without the need to decode compressed data. The format also supports broadcast metadata through an extension of the BWF (Broadcast Wave Format) chunk, allowing professional facilities to embed timecode, origination data, and description information.

Common Applications

W64 is primarily used in professional audio and video post-production environments where recording sessions routinely exceed the 4 GB WAV limit. Sony Vegas Pro and Sound Forge Pro use W64 as their native large-file format, and it is the default output when recordings would exceed 4 GB. Film and television post-production facilities use W64 for long-form multi-channel audio sessions, particularly when working with 5.1 or 7.1 surround sound at 24-bit/96 kHz. Live recording engineers use W64 for concert and event recordings that span several hours in high-quality multi-track configurations. Music production studios working with orchestral recordings or extended live sessions benefit from W64's ability to maintain a single continuous file rather than splitting across multiple WAV files. Broadcast facilities use W64 for long-form program recordings and archival of uncompressed audio. Scientific and research applications that require extended high-resolution audio capture, such as acoustic ecology and underwater acoustics, also employ W64. The format is supported by FFmpeg, making it accessible from command-line tools and enabling automated batch processing in production pipelines.

Advantages and Disadvantages