SD2 to AIFF Converter
Processing entirely on your device — large files may take a moment.
Sound Designer II and Audio Interchange File Format exist for different jobs: SD2 (Sound Designer II) is Digidesign's classic Pro Tools container — still the default export of many legacy studio sessions and Mac-era sample libraries. AIFF imports cleanly into Logic Pro and older Mac audio tooling.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How SD2 compares to AIFF
| SD2 | AIFF | |
|---|---|---|
| Compatibility | ffmpeg, archive tools | Mac-first |
| Best for | Rescuing legacy audio | Mac recording and production |
How to convert SD2 to AIFF
- 1
Select your files
Drag & drop your SD2 files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to AIFF". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted AIFF file individually, or grab everything at once as a ZIP archive.
About the SD2 format
HCOM is the Sound Tools compressor format from the late 1980s Mac — FIR-decimated delta-modulation samples that almost nothing modern reads.
ffmpeg decodes it natively inside your browser — the audio track is re-encoded to your chosen format with nothing ever uploaded.
+ Strengths
- ✓Decoded natively by ffmpeg
- ✓Runs entirely in your browser
- ✓Free, private, no watermarks
! Limitations
- −Legacy niche format
- −Modern tools rarely open it
- −Keep the original for archival round-trips
About the AIFF format
AIFF is Apple's counterpart to WAV: uncompressed PCM in an IFF container, born with the classic Mac in 1988. It stores the same bit-perfect audio as WAV but carries metadata far better — iTunes-era tags, cover art and loop points all fit natively, which made it the default of Logic Pro and Mac-based audio production.
Functionally the WAV-versus-AIFF choice is platform history: same quality, same sizes, AIFF friendlier on Mac, WAV friendlier everywhere else. Converting between them is a lossless retagging exercise, nothing more.
+ Strengths
- ✓Bit-perfect uncompressed audio
- ✓Better metadata support than WAV
- ✓Native to macOS and Logic Pro
! Limitations
- −Same bulk as WAV (~10 MB/minute)
- −Windows tooling historically prefers WAV
Why convert SD2 to AIFF?
Think of it as moving your file to the container that fits the job. Legacy niche format AIFF works differently: Bit-perfect uncompressed audio If any of that sounds like your task, run the conversion — it takes seconds and nothing leaves your device.
Frequently asked questions
Is this SD2 to AIFF converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for SD2 to AIFF?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Will converting SD2 to AIFF reduce audio quality?
If AIFF is lossless, the output contains everything the SD2 file contains — no further loss is added. If AIFF is lossy, one recompression pass is unavoidable; the quality slider controls how much. Loss that already happened in the source file can never be undone by converting.
Can I convert a whole folder of SD2 files?
You can select many files at once and they are processed in a single batch. Output files land in one ZIP download when there is more than one result.