W64 to SD2 Converter

Fast online W64 to SD2 audio conversion tool

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Bulk Conversion

Convert an entire folder of W64 recordings to SD2 at once. Just upload all files and let the batch converter handle the rest.

Simple Interface

Converting W64 to SD2 takes just a few clicks. Drag your file in, select the output format, and grab the result.

Fast Results

The W64 to SD2 conversion engine is optimized for speed. Most audio files are processed and ready to download within seconds.

How to convert W64 to SD2

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose sd2 or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your sd2 file right afterwards

About formats

W64 (Wave64) is a 64-bit audio container originally designed by Sonic Foundry — creators of Sound Forge — and later maintained by Sony after acquiring Sonic Foundry's desktop software division in 2003. The format directly addresses the 4 GB file-size ceiling imposed by Microsoft's 32-bit RIFF/WAV specification, a limitation that becomes problematic during long recording sessions, multi-channel captures, or high-sample-rate productions. W64 achieves this by extending chunk identifiers and size fields to 64 bits, using GUIDs instead of four-character codes. This structural change permits files to reach sizes measured in exabytes, effectively removing any practical storage constraint. The format supports arbitrary sample rates, bit depths, and channel configurations, making it well suited for film scoring, live concert recording, and scientific data acquisition. Sound Forge, Audacity, and other professional digital audio workstations provide native W64 support for seamless import and export. For engineers and producers who routinely work with long-form, high-fidelity material, W64 offers the reliability and simplicity of WAV without the frustrating size restriction.
Developer: Sonic Foundry
Initial release: 2001
Sound Designer II (SD2) is a professional audio format created by Digidesign around 1988 as the successor to the original Sound Designer format. For over a decade, SD2 was the standard interchange format in professional recording studios, especially those on Macintosh systems. It stores uncompressed linear PCM audio at up to 24-bit resolution with sample rates used in professional production (44.1, 48, 88.2, and 96 kHz). A distinctive technical trait is its reliance on the classic Mac OS resource fork for critical metadata — sample rate, bit depth, and channel configuration — while audio data resides in the data fork. This design worked elegantly within the Mac ecosystem but created portability challenges when files moved to Windows or Unix. A key advantage was SD2's support for multiple channels in a single file and tight integration with the Pro Tools editing environment, enabling non-destructive region-based editing. The format also carried loop points and markers, making it valuable for sample libraries. As Avid Technology shifted Pro Tools toward WAV and AIFF, SD2 usage declined, but millions of legacy session archives still contain SD2 files needing occasional conversion.
Initial release: 1988

Frequently Asked Questions

Why convert W64 to SD2?

W64 is a specialized Sony format for oversized recordings. Converting to SD2 makes the audio playable on standard devices.

What programs can open SD2?

SD2 can be opened with Pro Tools, Sound Designer, Audacity, macOS audio editors. Most modern audio applications handle this format without issues.

Does converting W64 to SD2 affect quality?

Lossless-to-lossless conversions preserve all audio data. When the target uses lossy compression, some quality reduction is inherent in the codec.

How many W64 files can I convert in one go?

Upload as many W64 files as you need and convert them to SD2 simultaneously. The batch feature handles multiple files efficiently.

Are my W64 uploads kept private?

Yes. Uploaded W64 files are deleted right after conversion, and the SD2 output is removed from our servers within 24 hours automatically.