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Optimize music files to reach your device’s sound quality limit, get compatible audio format or save disk space.
Audio file converter software for music production and home hi-end Read more...

Free mp3 Converter on Mac, Windows [Software] [AuI ConverteR 48x44]

AuI ConverteR 48x44 program is a pro studio converter of SACD ISO, DSF, DFF, WAV, FLAC, AIFF, APE, CUE, ogg, m4a, mp3 audio files and CD-audio. The software is intended for music production and audiophiles.

AuI ConverteR 48x44 FREE may be used as a free mp3 converter for Mac [Intel, Apple Silicon] and Windows. The converter provides professional processing (altering resolution - sample rate, bit depth and dithering) of audio files. mp3 files are coded and decoded via third party codecs, that may be downloaded and installed automatically.

Audiophile mp3 converter software

Free mp3 converter. Download AuI ConverteR 48x44


    for playback music on:
        digital audio player (DAP),
        media server/streamer,
        car stereo.

    Accurate resampling
    Export album artwork from source files or manual assigning to target files
    Easy-to-use software


WARNING: DVD-audio/video, Blu-Ray, DVD/BluRay/CD ISO are NOT supported.
For Modula-R version, SACD ISO, DSF, DFF are supported in proper configurations.
For ISO tracks, DSF, DFF longer than 3 minutes, FREE edition mutes 2-second silence in the output middle and has other restrictions



AuI ConverteR has several price/functionality options that allow saving your budget for the required functionality. You can expand Modula-R abilities later by purchasing new modules. Unlimited-time license, major updates (... 10.x > 11.x > 12.x > ... versions) are paid.

* All prices on this page are in U.S. dollars without V.A.T. and other applicable taxes and fees. The prices are recommended. Information on this page is not a public offer.

FULL-FEATURED version [AuI ConverteR PROduce-RD]

[MINIMUM PRICE] for full functionality of AuI ConverteR, in comparison with Modula-R edition that is including all modules.

FULL-FEATURED version [AuI ConverteR PROduce-RD]
Best Seller


All abilities are included in PROduce-RD version. It allows saving budget, comparing purchasing of the full abilities (all modules) of Modula-R edition. Unlimited-time license, paid major updates (... 10.x > 11.x > 12.x ...).

PCM converter [Modula-R edition]

[MINIMUM PRICE] configuration of WAV, FLAC (compressed/uncompressed), AIFF, ALAC (up to 24 bit / 192 kHz), mp3
audio file converter (PCM formats) [consists of 1 module]

PCM converter [Modula-R edition]
Best Seller


Minimum price configuration to conversion PCM files, including CUE splitter. Don't support CD-audio. May be expanded by purchasing of other modules.

Build custom configurations > Expand functionality > Ask for advice >



Watch and share: Free mp3 Converter. How to convert mp3 file



Audio quality

AuI ConverteR is conversion tool to change resolution and format of audio files. It is required for adaptation of audio files for different devices.

The program is designed for:

Read more about AuI ConverteR's sound quality...


Work with metadata

AuI ConverteR exports metadata (including artworks) from source to converted file .mp3, .wav, .flac, .aiff, .m4a, .dsf.


AuI ConverteR Free has builtin metadata editor of WAV, FLAC, AIFF, DSF audio files. Free edition has a limitation: no group editing of metadata.



mp3 encoders and decoders

Mp3 and other third-party codecs are connected to AuI ConverteR via the command line.  The codecs are auto downloaded and installed after user confirmation.

AuI ConverteR 48x44 processes resolution altering. The codecs convert audio files to/from "native" file types of AuI ConverteR: WAV, AIFF, FLAC, DSF.

Read details about external codecs.

How to set mp3 parameters...


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February 13, 2023 updated  | since May 5, 2017