Codec Toolbox


Audition codecs in real time, before committing to encode in either mp3 or AAC format.


Sound great in every format

Codec Toolbox is an affordable yet invaluable plugin to encode your music for the internet. We all want our music to sound great in every format, so why not take control of the process?

The product results from a partnership with the Fraunhofer Institute, the body that was significant in creating the mp3 and AAC formats that most listen to today. Audition codecs in real time before committing to encode, ensuring your music sounds as good online as it does in the studio. 

Codec Toolbox consists of two applications: the Toolbox plugin for auditioning your mix, and the Toolbox Manager for encoding it and adding metadata.

codec toolbox plugin gui


  • Multiple high quality codecs including mp3, AAC and iTunes+ 
  • Batch encode multiple files to save time 
  • Clip Safe auto-compensates for overs to keep your mix clean 
  • Add metadata such as track names and artwork 
  • Decode mp3 or AAC files to WAV or AIFF 


aax native
audio unit
vst 3
mac os
ilok usb

 This plug-in offers 2 activations for each product licence you own.

 All licences must be kept on the same iLok account, and each activation will allow you to authorise your Plug-In using the following methods:


  • iLok USB device. iLok2 / iLok3 required with latest drivers

 For more information about these choices please click here.

Pro Tools
  • Pro Tools 11 and above – AAX Native
  • Approved Pro Tools CPU, OS and hardware configuration:
Audio Units
  • Audio Units-compatible application (Logic, Digital Performer etc.)
  • Mac OS 10.12 or later (Intel or Apple Silicon)
  • VST3 compatible application (Cubase, Nuendo, Sequoia etc.)
  • Mac OS 10.12 or later (Intel or Apple Silicon)
  • Windows 7 or later



Please see the following support article on general DAW compatibility - General DAW Compatibility

The Sonnox Codec Toolbox does not support Avid’s TDM/HDX hardware DSP platform. This includes Venue, S3L and S6L systems.

CodecMode44.1 kHZ48 kHz
MP3CBR max/min11,400/6,32012,464/6,320
HE-AACCBR max/min6,355/6,2756,361/6,277
HE-AAC v2CBR/VBR8,1288,128
44.1 – 48 kHz:
88.2 – 96 kHz:-
176.4 – 192 kHz:-
  Pro-Codec Codec Toolbox
Real-time Codec auditioning
Encode to mp3 or AAC formats
Decode to WAV or AIFF
High quality codecs from Fraunhofer
High quality iTunes+ codec from Apple
Encode audio with samples rates up to 192kHz
Encode audio only at 32, 44.1 and 48kHz
Full resolution encoding of 16, 24 and 32-bit files
16-bit resolution encoding of 16, 24 and 32-bit files
Listen to difference between input and codec output
Visual frequency feedback from FFT
Detailed NMR frequency indicator
Ability to select up to 5 codecs for simultaneous comparison
Encode to 5 different formats simultaneously
ABX Test mode
Trim levels manually
Compression ratio meters
Online / realtime encoding with a DAW
Variable quality settings
Metadata editing
Batch processing