New: LeanFPS now measures your FPS and 1% lows, so you can see if a tweak helped.New: FPS and 1% low trackingSee how
LeanFPS
Download

Windows 10 and 11 · 64-bit

Download LeanFPS

LeanFPS is one file of about 6.5 MB. No installer, no account, nothing else to install. Run it, pick a preset, and start a game.

Early access. LeanFPS is being tested on real gaming PCs before the first signed public release. Email us with your PC and favourite games and we will send you the current build with its SHA-256 checksum.

Request early accessRead the safety rules first

Opens your email app, addressed to contact@leanfps.com.

System requirements

  • Windows 10 or Windows 11, 64-bit
  • Administrator rights
  • About 7 MB of disk space
  • Any CPU and GPU; laptops supported

First start

Windows asks for administrator rights, which LeanFPS needs to change power and priority settings. The window shows the recommended tweaks; nothing changes until you apply them.

Check the file

Every build we send comes with its SHA-256 checksum. In PowerShell, run Get-FileHash leanfps.exe and compare the result before you open it.

After you download LeanFPS

  1. Choose a preset: Recommended for most PCs, Competitive for esports, Laptop balanced for laptops.
  2. Start a game. LeanFPS shows the game, its genre and the game profile it applied.
  3. Play a few sessions, then look at your average FPS and 1% low against your usual.
  4. Keep the Windows gaming tweaks that help; switch off the rest.

Closing the window keeps LeanFPS in the notification area: grey while idle, green while it is optimizing a game. Quit it from the tray icon. Learn more about the LeanFPS game optimizer or compare Free and Pro.

Command line

leanfps.exe opens the window. leanfps.exe --restore-all undoes every change LeanFPS made and exits, which is useful before uninstalling or if you ever cannot open the window.

Download FAQ

When can I download LeanFPS?

LeanFPS is in testing on real gaming PCs. The public download opens with the first code-signed release. Email us to join early access and we will send you the build and its checksum.

Why does Windows SmartScreen warn about LeanFPS?

SmartScreen warns about programs that are new or not yet code-signed. Public releases will be signed. If you see the warning on an early-access build, choose More info, then Run anyway, only if you got the file from us.

Do I need to install anything else?

No. LeanFPS is one exe with no .NET, Visual C++ runtime or WebView requirement. Put it anywhere and double-click it.

How do I uninstall LeanFPS?

Press Restore all, or run leanfps.exe --restore-all, then delete leanfps.exe and the folder C:\ProgramData\LeanFPS.