MP3DEC.EXE
A single parameter is required: the filepath of the file(s) to convert. You may use the asterisk or question mark wildcard to convert multiple files in one operation. You may optionally specify the output filepath of the WAV to be created, but if omitted, this will create the WAV in the same folder and with the same filename as the original, except it will have the .WAV extension. Alternatively, the second parameter can be the path of an output folder.
Usage
MP3DEC [/mono] [/nis] [/nologo] [/nos] [/r] [/trim[#]] source [target]
| /mono | Convert stereo to mono. |
| /nis | Don't report statistics about the input file. |
| /nologo | Disable the program banner. |
| /nos | Don't report statistics about the output file. |
| /r | Recursively enter subfolders when looking for filename matches. Useful when using the * and ? wildcards. |
| /trim[#] | Trim silence from the beginning and end. You may specify a threshold, default is 200. |
Example - Output file in same folder and with same filename
mp3dec "c:\music\Let It Be.mp3"
Sample Output:
MP3DEC.EXE 2.1 - MP3 Decoder - www.gammadyne.com
Copyright (C) 2025-2026 by Greg Wittmeyer - All Rights Reserved
Decoding "c:\music\Let It Be.mp3" to WAV
SOURCE DETAILS
Size: 4.35 MB
Bit rate: 191 kbps
Channels: 2
Sample rate: 44100 Hz
Duration: 3:10
MP3 decode successful. 344 milliseconds
Output file: c:\music\Let It Be.wav
WAV size: 31.84 MB
Compression: 86%
TARGET DETAILS
Channels: 2
Sample rate: 44100 Hz
Bits/sample: 16
Example - Wildcard, Different Output Folder
mp3dec "c:\music\*.mp3" "c:\decoded\"
Example - Trimming silence
mp3dec "c:\flacs\Let It Be.mp3" /trim250
Notes
- Meta tags are copied from the source file to the new output file (if present).
Download
Click the button below to download version 2.1 of MP3DEC.EXE, released January 6th, 2026.
Download