I don't know if it's something related to the notebook I'm using but with RDTabs 3 I have quite bad quality at remote desktops.
This doesn't happen at my desktop but I'm using Windows 7 there.

Can you post a screenshot?

Also try with the built-in RDP tool and see if it has the same quality.

Can you post a screenshot?

Also try with the built-in RDP tool and see if it has the same quality.

Sure, sorry for the delay.
Built-in RDP doesn't show this behavior. It is like also the menus text is also blurry. The only app I have this issue.

  blurry_rdtabs.png (164kb) downloaded 46 time(s).
Of course in the screenshot is not as perceivable as in front of the screen. But it is there.

Are you using a high DPI monitor with scaling set in the Display Settings above 100%?

Try this. Go to RD Tabs -> Tools -> Options. Check the "Use full native resolution of screen for high DPI displays" and then restart RD Tabs.

It might be high density (14"at 1920x1080) and yes, it's at 125%
Your recommendation worked. Thank you!

Glad it worked! RD Tabs tells Windows to upscale itself by default because if you are using a device like a Microsoft Surface, where the DPI scaling is 200%, the icons on remote servers become too small to interact with. Unfortunately, for systems where you only upscale by 125% or so are also considered "high DPI" so you get basically just slightly blurry icons as a trade-off. 😉