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Sound quality improvement solutions for everyone


Fidelizer is the audiophile’s system optimizer that optimizes Windows for audio applications. It works with any media player software including Roon and streaming services such as Tidal, Spotify, Qobuz, YouTube, and others.


Unleashing Core Audio


Unleashing Core Audio


Give audio task more priority with dedicated core, improve low latency audio performance, and increase accuracy of clock resolution.

Take control of system responsiveness and network utilization completely by optimizing Windows multimedia scheduling platform.

Controlling processes


Controlling Processes


Isolate core affinity of non-audio process to single dirty core and reduce its priority so it won’t hinder audio related processes.

Launch media player software with higher priority from Administrator account by-passing permission filters for solid performance.

Managing services


Managing Services


Stop/Disable most system services that aren’t used in audio applications leaving only audio related services running.

Keep services for some audio applications that require network, remote control, or even security services smartly.


The goal of Fidelizer’s optimizations is to reduce the “digital glare” in computer audio solutions and make music comes alive with a feeling of real sound. Fidelizer has free version without time limit. All changes made by Fidelizer are safely reversible.




Fidelizer works with JPLAY/AudiophileOptimizer/Roon


Fidelizer is fully compatible with JPLAY/AudiophileOptimizer/Roon, and we developers are supportive and help each other.


JPLAY Marcin and Windows X exchanged ideas on the XXHighEnd forum including some Fidelizer’s core concepts long before founding JPLAY and Fidelizer. That’s why  they work great together.


Audiophile Optimizer Phil used Fidelizer long before developing AudiophileOptimizer. We helped each other for Fidelizer Pro’s startup and implementing multimedia services in Core mode.


Roon Right after making Fidelizer support thread in Roon community, Mike offered a warm welcome and we’ve been improving software compatibility with Roon better.


You won’t have to ever worry about incompatibility issues. 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.



Fidelizer removed the remaining veils and ensured the musical message was delivered in an effortless fashion.

The enhancement of depth and the resolution of the complex layering of large-scale orchestral music came off stunning with Fidelizer.

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

Focus and definition improved with an added bonus; a slight midrange hardness I have heard in JRiver was now gone.

Fidelizer is a must for audio playback with windows PCs!

Hearing into and through full scale orchestral works is near revelatory using Fidelizer Pro.

More peace, more flexibility, more detail and a bigger, better focused stereo image.Undoubtedly a package that does a good job.

Once you try it – will become unavoidable.

For me, now, I cannot imagine going forward without Fidelizer.





Enjoy the music better with Fidelizer Upgrade Program


Fidelizer has been improving computer audio sound quality for free since 2011. As time goes by, new  computer audio solutions are growing so we decided to launch the upgrade program to extend support and product capabilities.

To read the product’s features and ordering details, including pricing on, please check Fidelizer Upgrade Program.