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How to open .SD2 files on iOS

To open .SD2 files on iOS, iOS support for SDII is uncommon; if the Files app can’t preview it, send the .sd2 file to a desktop system (preferably macOS with Pro Tools) to import/convert it to a more mobile-friendly format.

Step-by-step instructions

  1. iOS support for SDII is uncommon; if the Files app can’t preview it, send the .sd2 file to a desktop system (preferably macOS with Pro Tools) to import/convert it to a more mobile-friendly format.

Common issues

The .SD2 file won’t open or import

Many modern apps don’t support Sound Designer II, and support can vary by product and version (notably in Pro Tools).

  1. Try importing the file in Avid Pro Tools and confirm your version’s SD2 behavior using Avid’s SD2 support article.
  2. If it still fails, open/convert the file on a Mac system with better legacy SDII handling, then use the converted WAV/AIFF in your current workflow.

File plays but metadata/regions are missing after copying between systems

SDII historically used Macintosh-specific file structures (including resource fork usage), and moving the file through file systems or tools that don’t preserve these can cause metadata loss or incompatibility.

  1. If possible, re-copy the file using a method/toolchain that preserves Mac file metadata, then re-import on macOS.
  2. After successfully opening, export/convert to a modern format to avoid repeated metadata loss.

Pro Tools behavior changed (conversion, support limitations, or unexpected results)

Avid documents SD2 handling changes in Pro Tools versions; you may see automatic conversion on import or reduced direct support depending on the version.

  1. Check Avid’s knowledge base article for the exact Pro Tools version you’re using and follow the recommended workflow.
  2. If you need maximum compatibility, convert SDII to WAV/AIFF as an intermediate step and relink/import the converted audio.

Security note

SDII is an audio container (not a scriptable document format), but malformed or corrupted media files can still trigger bugs in audio parsers; prefer opening unknown SDII files in well-maintained, reputable audio software.

Back to .SD2 extension page