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The mp3TrueEdit application icon.
Mp3TrueEdit 2 1 Fade In Effect.png
Editing MP3 files in mp3TrueEdit
Stable release 2.1 / 19 March 2015
Operating system Microsoft Windows, Mac OS X
Type Digital audio editor
License Proprietary
mp3TrueEdit (touch)
Screenshot of mp3TrueEdit (touch) v 3.0 Open File.png
Editing MP3 files in mp3TrueEdit (touch)
Stable release 3.0 / 28 May 2015
Operating system Android
Type Digital audio editor
License Proprietary

mp3TrueEdit is a desktop and mobile app that allows you to edit MP3 and AAC audio files without losing any quality. This is done by modifying compressed audio frames directly so that cut, copy, paste and volume change operations can be achieved without generational loss.[2]

Its 'direct' editing of MP3 and AAC files is achieved by splitting, joining and trimming audio on the compressed audio frame boundaries. In addition each audio frame can have its individual volume level adjusted by modifying the global gain[3] field in the frame's header.

It differentiates itself from a full blown digital audio workstation but shares many of their features such as recording and editing using cut, copy, paste and crop commands. In addition fade in and out operations and volume level adjusting operations such as normalization can be performed.

It is not however able to perform other more advanced editing operations that would require decompression and processing of the raw PCM audio information such as effects and cross fading.

As part of its freemium business model mp3TrueEdit allows free use of its MP3 and AAC recording features and also allows using the LAME encoder.


  • No degradation in audio quality when editing MP3 and AAC files.
  • Edits can be made quickly and easily without the need for decompression and re-compression.
  • Prevents corruption of frame information allowing edits to made at any location.
  • Greatly reduced disk space usage when editing MP3 files.
  • Quick visualization of MP3 and AAC audio information to aid finding and editing audio.
  • Scrubbing of audio during playback.
  • Pitch and Tempo adjustment during playback.
  • Familiar cut, copy, paste, delete and crop operations with unlimited undo and redo.
  • Fade in, fade out, normalization and volume level adjustments.
  • Make any section of audio completely silent or insert new silent sections.
  • Track splitting with ID3 metadata tagging.
  • MP3 and AAC recording using built-in encoders or the LAME encoder (not bundled).


Granularity limitations
  • Editing operations can only be performed at the start of an MP3 or AAC frame (typically 23 or 26 ms in length).
  • Gains and fades are limited to 1.5 dB steps, as they are achieved by modifying the value of the MP3 or AAC frame's global gain field.
  • effects such as filters, mixing or crossfading between sources is not possible as this would require decompression and re-compression with an associated quality loss.[4]
Unimplemented features
  • Automatically splitting audio based on CUE sheets is not supported.

See also[edit]


  1. ^ C2 Solutions Ltd., trading as
  2. ^ "mp3TrueEdit Review - mp3TrueEdit Download". Softpedia. Retrieved 2012-07-14. 
  3. ^ Ruckert, Martin (2005). Understanding MP3. 
  4. ^ "MP3 - Audacity Wiki". 2012-06-30. Retrieved 2012-07-14. 

External links[edit]