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"Fidelizer resulted in the biggest single improvement to my hi-fi that I have yet encountered!"

Nick Whetstone, TNT-Audio

For the first time ever to fully utilize multimedia realtime framework optimization of "Core Audio" to improve Windows audio performance.


Fidelizer improves sound quality on Windows with any media players, and support streaming services such as Tidal, Spotify, Qobuz, YouTube, and others.

The easiest way to improve sound quality in Windows

With single click of “Fidelize” button, you can sit back and enjoy good music in one minute. Fidelizer improves sound quality on Windows by optimizing its core audio services on the fly with the following features below.


Fidelizer's Core Features


Default configuration performs only unleashing core audio features that won’t significantly affect over all performance and can improve further with higher optimization levels. You can learn more about features by reading the User Guide, including options and features from the upgraded versions.


Fidelizer is FREE and SAFE to try

Many audiophiles have been looking down on Windows since the rise of computer audio in OS X platform. To prevent that, Fidelizer was released to public for free so Windows users won’t be treated lightly anymore. Fidelizer will always be available for FREE to keep up audio quality on par with OS X.

Since most sound quality improvement solutions are about changing system configuration permanently, there’s a chance to damage the system. So Fidelizer will only perform SAFE optimizations that won’t make changes to system configuration permanently. Everything will revert back to normal after system restart so there’s no risk in damaging system.


Fidelizer is partnered with JPLAY/Audiophile Optimizer

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

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

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

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


Enjoy music more with Fidelizer Upgrade Program

Fidelizer has been improving computer sound quality for free over past 2 years. As time goes by, new  ways to play audio like NAS/streaming audio is growing and some changes need to be updated in newer version of Windows. To maintain our products and services, we decided to launch upgrade program to extend support and products’ capabilities.

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



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:


AudioStreamI also use a neat little shareware program called Fidelizer that optimizes various background computer functions for music playback. This brings me to another point. I also use a neat little shareware program called Fidelizer that optimizes various background computer functions for music playback. This brings me to another point. If you’re getting into this field thinking computer audio to be easier by omitting the tweakier aspects of high-end audio—fuggeddaboudid.

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 really like with my Audio PC setting. With AudiophileOptimizer 1.30, it gives extra impact on sound. Current my best feedback setting is below…

– Client PC : Windows 8 (not 8.1) + Fidelizer Pro 6.1 + JRiver 20/JPLAY 5.2.1
– Audio PC : Windows Server 2012 + AudiophileOptimizer 1.30 + JPLAY 5.2.1

I 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.

I may need more time to conclude testing, but I can say Fidelizer Pro definitely help my PC Audio life.

Thank you,
SH Yoon

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!


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

Thanks for getting the program to me so quickly. I have had a few hours with it this this evening & WOW!! what a difference compared to the free version. I’m so glad I upgraded & I will probably go Pro next month when I have the money. Is it correct that I could do that for an extra $30? The bass is deep & tight now & the soundstage is wide & precise. The shear amount of small details i’d never heard before was amazing even though I have a decent system. Thank you for you hard work in creating this program & improving my listening experience by such a large margin :-)


After upgrading to Fidelizer Pro

“Much more subtle changes this time but very nice one’s. The soundstage is fantastic, wide & 3D. Also, vocals are brilliant. Lyrics I could never make out are now clear to me without straining to grasp them. It’s taken the last bit of harshness from the treble & as a result female voices are smooth especially sopranos. I just want to keep playing my music now!! :)


Michael Ashton (JPLAY)



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