User Manual

Stemly Convert

Audio Format Converter — available for Mac and iPhone / iPad. This manual covers the Mac version.

Contents

  1. Requirements
  2. Installation
  3. Supported Formats
  4. Converting Your First File
  5. Batch Conversion & Folder Structure
  6. Quality Settings
  7. Troubleshooting

1 Requirements

ItemRequirement
MacmacOS 13 Ventura or later
ProcessorApple Silicon or Intel Mac
Storage~50 MB for app installation
InternetNot required — all processing is local
PriceOne-time purchase

2 Installation

  1. Download Stemly Convert from the App Store or the download link you received.
  2. Open the downloaded file and drag Stemly Convert to your Applications folder.
  3. Launch Stemly Convert from Launchpad or Applications.

3 Supported Formats

Input FormatsOutput Formats
WAV, AIFF, FLAC, M4A, MP3WAV, AIFF, FLAC, M4A
💡 Tip: MP3 is supported as an input format — you can convert from MP3 to WAV, AIFF, FLAC or M4A. All processing is done locally with no quality loss beyond the original file.

4 Converting Your First File

  1. Drag an audio file or folder onto the app window, or click the + button to browse for a folder.
  2. Select the output format from the dropdown (WAV, AIFF, FLAC, or M4A).
  3. Choose quality settings (see section 6).
  4. Click Choose Output Folder and select where converted files will be saved. This step is required.
  5. Click Convert to start processing.

Converted files are saved inside a named subfolder in your chosen output location, preserving the original file names with the new extension.

5 Batch Conversion & Folder Structure

Convert entire folder trees in one click:

  1. Drag one or more folders onto the app window (or use the + button to add them).
  2. Set the output format and quality.
  3. Click Choose Output Folder to set the destination.
  4. Click Convert — all files in all folders are processed at once.
💡 Folder structure is preserved. Each source folder gets its own named subfolder in the output. Subfolders inside are recreated exactly as they were — no files are mixed together.

6 Quality Settings

FormatQuality Options
WAV16-bit, 24-bit • 44.1 kHz, 48 kHz, 96 kHz
AIFF16-bit, 24-bit • 44.1 kHz, 48 kHz, 96 kHz
M4AHigh (256 kbps), Medium (192 kbps), Low (128 kbps)
FLACLossless — no quality setting needed
💡 Tip: For stems and session files, use WAV 24-bit / 44.1 kHz for the best compatibility with DAWs and Stemly.

7 Troubleshooting

Convert button is greyed out

You need both source files/folders and an output folder selected. Click Choose Output Folder to set the destination — the button activates automatically.

Output file is silent or corrupted

1. Verify the input file plays correctly in another app (QuickTime, VLC).
2. Try a different output format.
3. Check that there is enough free disk space in the output location.

Files are missing from the output folder

Only files matching the supported input formats (WAV, AIFF, FLAC, M4A, MP3) are converted. Other file types in the source folder are skipped automatically.

Conversion of FLAC to M4A is slow

FLAC to M4A requires full re-encoding. WAV and AIFF conversions are faster since they change container format only.

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