New: v1.5.0 Enhanced Edition · Free & Open Source · 🌍 Multilingual

Optimize Windows 11
in One Click

The best free Windows 11 optimizer. Boost PC performance, protect your privacy, and clean up disk space — safely and reversibly. No bloatware, no third-party tools, no risk.

Download K-Win v1.5.0 Explore Features
30+ Optimizations
6 Categories
3 Languages
168 Automated tests
✓ Open Source ✓ No Telemetry ✓ Works Offline
K-Win 1.5 dashboard with live CPU, memory, disk and GPU monitoring
About

What is K-win?

K-win is a free, open-source Windows 11 optimizer built with .NET 8 and C#. Unlike other PC optimization tools, K-win focuses on doing 10 things perfectly rather than 100 things poorly.

🎯

Focused Optimization

30+ carefully selected optimizations across Performance, Privacy, Cleanup, Startup, Tweaks, Apps and Memory. Each one shows its current state, benefit, side effects and how to undo it.

🔓

100% Open Source

Every line of code is visible on GitHub. No hidden processes, no data collection, no secrets. Build from source yourself if you prefer.

🛡️

Safety First Design

System Restore Points created automatically. Registry backed up before changes. Up to 5 operations can be undone instantly. Nothing is permanent.

Benefits

Why Use K-win?

1

Faster Boot & Better Performance

Optimize power plans, disable unnecessary visual effects, manage startup programs, and enable Game Mode for maximum Windows 11 performance.

2

Enhanced Privacy Protection

Reduce Windows telemetry, disable ad tracking, clear activity history, block 60,000+ ad domains system-wide, and disable Windows Recall AI.

3

Reclaim Disk Space

Clean temp files, browser caches (Edge, Chrome, Firefox), Microsoft Store cache, and run system repair tools like SFC and DISM.

4

Remove Bloatware Safely

Identify and remove pre-installed Windows 11 bloatware with one click. Remove for all users to prevent reinstallation.

Typical Results After K-win Optimization

Boot Time
Before: 45 sec
After: 28 sec
38% faster
Disk Space
Before: Full
After: 2-5 GB freed
Cleaner system
RAM Usage
Before: 4.2 GB idle
After: 2.8 GB idle
33% reduction
Privacy Score
Before: Limited
After: Enhanced
60K+ ads blocked
Features

Complete Windows 11 Optimization Suite

Six modules covering Windows 11 optimization. Every change is previewed first, and registry changes can be undone.

Performance Optimization

  • Power Plan Selector

    Switch to High or Ultimate Performance plans for maximum speed

  • Visual Effects Optimizer

    Disable animations, shadows, and transparency for faster UI

  • Startup Manager

    Enable or disable startup entries the way Task Manager does; nothing is deleted

  • Optimize Now

    Recommendations grouped by risk; only low-risk items pre-selected

  • Game Mode & Fast Startup

    Toggle gaming optimizations with status detection

Privacy Protection

  • Telemetry & Ad ID Control

    Reduce diagnostic data, turn off advertising ID tracking

  • Activity History & Recall

    Clear timeline data and disable Windows Recall AI (24H2+)

  • DNS Changer

    Switch to Cloudflare, Google, Quad9, or OpenDNS for private browsing

  • Respects Your Organization

    Settings set by your organization or local Group Policy are shown read-only

Disk Cleanup Tools

  • Temp File Cleaner

    Measured sizes before cleaning; cancel at any time; junctions never followed

  • Browser Cache Cleaner

    Clean Edge, Chrome, Brave and Firefox caches; passwords and cookies are kept

  • System Repair Tools

    Run SFC and DISM directly from the app

  • Store & Recycle Bin

    Reset Microsoft Store cache; Recycle Bin only when you select it

Windows Tweaks

  • Dark / Light Mode

    Toggle system-wide theme instantly

  • Classic Context Menu

    Restore full Windows 10 right-click menu

  • Widgets & Chat

    Disable widgets, Teams chat, and more

  • Shutdown Speed

    Optimize shutdown and menu response times

App Management

  • App Uninstaller

    Browse and uninstall Store & Desktop apps easily

  • One-Click Bloatware Remover

    Find common preinstalled apps and remove the ones you choose

  • Remove for All Users

    Optional advanced setting, off by default

Monitoring & Memory

  • Live System Monitor

    CPU, memory, disk and GPU from Windows performance counters

  • History & Undo

    Every operation with original → new values; undo one operation when safe

  • SysMain Control

    Toggle SysMain (Superfetch) and memory compression

Screenshots

See K-Win 1.5 in Action

Real captures of K-Win 1.5 Enhanced Edition: dark and light themes, English, Français and العربية.

Optimize Now dialog with recommendations grouped by risk
Optimize Now: recommendations grouped by risk, with a full preview
History page with original and new values
History: original → new values and per-operation undo
Performance settings cards
Performance: current state, benefit and undo for each setting
Privacy settings
Privacy: diagnostic data, advertising ID, activity history, Recall
Cleanup page with measured sizes
Cleanup: measured sizes before anything is deleted
Startup Manager in light theme
Startup Manager (light theme)
Tools and tweaks page
Tools › Tweaks: interface preferences, apps and memory
Privacy page in French
Français: Privacy page
Privacy page in Arabic, right to left
العربية: full right-to-left layout
Performance page in Arabic
العربية: Performance page

Screenshots were taken on the Windows 10 development computer in a developer-only, read-only preview mode, which is why the title bar says "Development UI preview". The released app does not include this mode and runs only on Windows 11.

Safety First

Is K-Win Safe?

Several safety layers protect your system. Registry changes can be undone; file deletions cannot, and K-Win tells you before you confirm.

Automatic Restore Points

Created before system changes; K-Win says when Windows reuses one from the last 24 hours

Registry Backups

Backed up to a .reg file before writing, then read back to verify

Undo & History

Undo the last change or one operation from History, even after a restart

Preview Mode

See every change before it happens — nothing applies without confirmation

Full Activity Logging

Every operation logged as JSON with timestamps and values

Least Privilege

Starts without administrator rights; asks to elevate only when needed

What K-win Will Never Do

No third-party executables. No boot config changes. No disabling Windows Update, Defender, or Store. No unsigned scripts. Only safe, documented modifications.

Compatibility

Windows 11 Compatibility

K-Win is built for Windows 11. Version 1.5 has 168 passing automated tests; manual validation on Windows 11 is still in progress (checklist).

✓ Designed For

  • Windows 11 22H2
  • Windows 11 23H2
  • Windows 11 24H2
  • Windows 11 Home
  • Windows 11 Pro
  • Windows 11 Enterprise

✗ Not Supported

  • Windows 10 (any version)
  • Windows on ARM
  • Windows Server
  • 32-bit systems

System Requirements

  • x64 (64-bit) processor
  • Administrator rights only for system-wide changes
  • ~150 MB disk space
  • No .NET install required (self-contained)

Download K-win Free

Free, open-source Windows 11 optimizer. No signup, no bloatware, just a single EXE file.

Version 1.5.0
Size 63.6 MB
Platform Windows 11 x64
Runtime Self-contained
Download K-Win-1.5.0.exe
Star on GitHub View All Releases

Requires Windows 11 22H2 or later. No installation; just run the file. Manual Windows 11 validation of 1.5 is pending: create a restore point before first use and report any problem.

⚠️ SmartScreen notice: Windows may show a "Windows protected your PC" screen because K-win is not yet code-signed — this is not a virus detection. Click More info → Run anyway. If the button is missing, right-click the file → Properties → check Unblock → OK.

Quick Start Guide

  1. Download K-Win-1.5.0.exe
  2. Double-click it (no administrator prompt)
  3. Select your language (English, French, Arabic)
  4. Click Optimize Now or choose individual settings, then review the preview
  5. Apply and restart if prompted

File Verification

SHA-256:
66213E433940A8DD8AC80D1D403CBDA47365F61F6F374ECA864E8FE27E044D14
Check with Get-FileHash K-Win-1.5.0.exe. Source code on GitHub.

FAQ

Frequently Asked Questions

Everything you need to know about K-win Windows 11 optimizer.

K-Win is designed to be safe. It creates a restore point before system changes, backs up registry values before writing and verifies each change. Registry changes can be undone from the Undo button or the History page. File deletions (cleanup) cannot be undone, and the preview says so before you confirm. K-Win uses only built-in Windows tools and never downloads or runs third-party programs.

No. K-win never disables Windows Update services, Windows Defender, or any critical system service. Diagnostic data is reduced to the Required (Basic) level, not switched off — level 0 can affect updates, so K-Win avoids it.

K-win modifies specific registry keys for visual effects, telemetry, advertising ID, context menu, and Windows Recall. It uses powercfg.exe for power plans, netsh.exe for DNS changes, and deletes only temporary files, error reports, browser caches and (if you select it) the Recycle Bin. A complete list is documented in the SAFETY.md file included with the source code.

Yes. Click "↶ Undo" in the top bar to revert the last change, or open History to undo a specific operation (K-Win refuses if a later operation changed the same values). Registry changes can be undone even after a restart; service and power-plan steps only while K-Win stays open. A restore point is also created before system changes.

Only for some changes. K-Win 1.5 starts as a normal user. System-wide settings, DNS, services and SFC/DISM need administrator rights; K-Win explains why and offers to restart as administrator through the standard UAC prompt.

No. K-win is designed specifically for Windows 11 (build 22000 and later). Many of the registry paths and features are Windows 11-specific. Running on Windows 10 will show a compatibility error. A Windows 10 version is not currently planned.

K-win is built from source code using .NET 8 and Microsoft's official SDK. It does not use obfuscation or packing techniques that trigger false positives. If your antivirus flags it, you can verify the source code on our GitHub repository and build it yourself.

Yes, K-Win is completely free with all features unlocked. No trials, no ads, no signup required. The project is open-source and available on GitHub. We may offer a Pro version with additional features in the future, but the core optimizer will always be free.

K-win supports English, French (Français), and Arabic (العربية) with full RTL layout support. The language picker appears on first launch, and you can switch languages anytime from Settings. All 30+ features and UI elements are fully translated.

The DNS Changer uses the built-in Windows netsh command to switch your active network adapter's DNS to privacy-focused providers like Cloudflare (1.1.1.1), Google (8.8.8.8), Quad9 (9.9.9.9), or OpenDNS (208.67.222.222). You can also reset to automatic (DHCP) DNS. No third-party software is installed.

Both were removed in 1.5 for safety. K-Win no longer downloads a hosts-file blocklist (it can still remove entries added by 1.0), and "Clear cached RAM" gave no real benefit because Windows manages that memory itself.