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Are you computer audiophile? If so, Fidelizer will help you enjoy the music on computer even more.

"With the Fidelizer performing its magic, the sound certainly benefited enormously. Everything sounded vivacious, dynamic and very exciting."

Matej Isak, Mono and Stereo

Awarded with 6moons Realsization, Fidelizer is the most effective way to reduce the "digital glare" effect and make music come alive by optimizing Core Audio directly.


Fidelizer improves sound quality on any media player including Roon, and supports streaming services such as Tidal, Spotify, Qobuz, YouTube, and others.

The easiest way to improve sound quality in Windows


With a single click of the “Fidelize” button, you can sit back and enjoy the music. It’s really easy for everyone to use Fidelizer as a sound enhancer. Fidelizer improves sound quality by optimizing Windows Core Audio with the following features:


This is how Fidelizer can help computer audiophile users improve sound on their computers.


Default configuration performs only the unleashing of core audio features for safe optimization. You can learn more about how Fidelizer enhances Windows sound quality with other optimizations and the way to efficiently use Fidelizer by reading the User Guide for useful tips.


Fidelizer is “FREE” and “SAFE” to try


Since the rise of computer audio on the OS X platform, Fidelizer was released to the public for free so that Windows users can enjoy high quality sound on their systems. Fidelizer will always be available for FREE to keep audio quality on par with OS X.

Some people don’t feel safe using sound quality improvement solutions that change system configuration permanently, so Fidelizer only performs SAFE optimizations that won’t make permanent changes. System will revert back to normal after restart so there’s no risk of damaging your system.


Fidelizer is partnered with JPLAY/Audiophile Optimizer


JPLAY Audiophile Optimizer


Fidelizer is fully compatible with JPLAY/Audiophile Optimizer, and we developers are also friends helping each other.

JPLAY – Marcin and I exchanged some tips and tweaks on the XXHighEnd forum including some Fidelizer’s core concepts before founding JPLAY and Fidelizer. Fidelizer’s optimizations are also done with JPLAY in consideration.

Audiophile Optimizer – Phil used Fidelizer long before developing AudiophileOptimizer. In the recent version 1.31, he improved Fidelizer Pro’s startup compatibility and I helped him implementing Multimedia Class Scheduler service in core mode.

You won’t have to ever worry about incompatibility issues with JPLAY and AudiophileOptimizer. Unlike certain companies that refused to provide support or even banned it, we helped each other in our fields of expertise for best sound quality.




6moons Realsization 2015 Award for Fidelizer Pro


Realsization takes standards educated by exposure to the best of audio and investigates how much money can be saved while maintaining the essence of ultra performance. Fidelizer Pro is also the first software and the cheapest product ever to receive Realsization award from 6moons.




6moons AudioStream Mono and Stereo PC Audio Club TNT-Audio


Since moving Fidelizer to a new home, there have been requests to send copies for product review by a few respectable audiophile websites. Some are kind enough to give us a review about Fidelizer products, as below:


AudioStreamTo me, most computer playback systems sound slightly flat, two-dimensional and lacking in body. The enhancement of depth and the resolution of the complex layering of large-scale orchestral music came off stunning with Fidelizer. Whilst aspects like flow, reduction of hashy treble and quieter backgrounds generally differentiate computers from dedicated disc transports, the latter tend to take the palm in weight, texture and body.

AudioStreamThe improvements to the sound while listening to JRiver and Foobar were quite obvious to me. The soundstage became much wider and deeper; the bass was now better defined. Focus and definition improved with an added bonus; a slight midrange hardness I have heard in JRiver was now gone. I also observed that JPlay continued to work with Foobar2000.

Mono and StereoThis a marvelous piece of work that also puts the average sound system to a harsh test. With the Fidelizer performing its magic, the sound certainly benefited enormously: the large scale, complex music was handled extremely well, with exceptional separation of the individual instrumental sections, with lots of air around them and with gorgeous brass and string tone. Everything sounded vivacious, dynamic and very exciting.

PCAudioI think it is the best sound I ever heard with my Audio setting. Very clear background and close to perfect image (I assume there is no perfect with Audio since every new technique comes). Especially, when I listen big scale symphony like Mahler Symphony No.2, I can hear different stage of music. Better dynamics and better image. Thank you for great software.

TNT-AudioThere is clearly more transparency, enough that you don’t have to listen for it. The music comes from an even ‘blacker’ sound stage, and sounds relaxed but not soft. It’s as though you have been listening to your hi-fi just outside of the room, and then gone in and sat in front of it. This is not one of those tweaks where you need to listen for a few days to realise that something has changed for the better. And there’s the bonus of just being able to turn on the computer, open your music player, and be ready to play back some music. Fidelizer resulted in the biggest single improvement to my hi-fi that I have yet encountered!


Enjoy music more with Fidelizer Upgrade Program


Fidelizer has been improving computer sound quality for free since 2011. As time goes by, new  ways to play audio like NAS/streaming audio are growing and some changes needed to be made for newer version of Windows. To maintain our products and services, we decided to launch the upgrade program to extend support and product capabilities.

You can read the product’s features and ordering details, including pricing on, the Fidelizer Upgrade Program page.


What customers say about us


To ensure you’ll receive good quality products and services, I’d like to share what customers say after trying our Fidelizer Upgrade Program. These are quoted from their feedback without changing any content so feel free to read it.


Read all customers’ feedback

I downloaded and installed Fidelizer Pro.  Since I use a PS Audio Perfect Wave II, I set it up in Network Transport mode.  The sound improvement is greater than that of standard Fidelizer, a broad and high soundstage when I have set the absolute phase switch correctly.

Julius Moshinsky


After reading those wonderful stories, you can consider applying the Fidelizer Upgrade Program here. If you’re using upgraded Fidelizer software and currently enjoying good music, please share your story with us.