Portable O&O Defrag Professional v31.3.26064 (x64)
O&O Defrag tidies up this shoebox by combining the snippets of a file and writing them one after the other to the hard drive or SSD. In addition, the files are reorganized so that the access times during loading are minimized. This saves you time and protects your data carriers. Regular use of O&O Defrag noticeably increases the access speed and overall performance of your Windows system. And so that you never have to worry about “file snippets” again, O&O Defrag can also be run completely automatically in the background.
Simply simple
Everyone should have a fast computer. That’s why we’ve made O&O Defrag 31 so simple that anyone can use it. The new modern view does not require complicated settings.
Not a difficult decision as to which is the best defragmentation strategy for your PC. O&O Defrag takes care of everything itself. All you have to do is choose whether you want to start O&O Defrag manually yourself or whether you want it to take care of everything automatically.
O&O VisualDisk
Visualization of write access to SSDs
With O&O VisualDisk, write access to the hard drive as it takes place on flash-based storage media such as SSDs and NVMe drives is clearly displayed. This innovative feature shows how defragmentation can help reduce future write accesses and extend the lifespan of SSDs. The user gets a clear picture of how the hard drive works and how its performance can be optimized through targeted measures. O&O VisualDisk helps you understand how O&O Defrag can get the most out of a hard drive and protect it from unnecessary wear and tear – for a long-lasting and fast PC system.
O&O StartupManager
Remove unnecessary ballast at take-off
The new O&O StartupManager offers a clear overview of all programs, tasks and services that are automatically executed when Windows starts. With detailed information about each program – including how it affects the system’s startup time – it is easy to decide which programs should be enabled or disabled. Unnecessary applications are marked as such and can be deactivated with a mouse click. Defective start entries are also detected and can be deleted. This shortens the startup time of the computer and ensures that it is ready for use faster.
New Boot-Time Optimization and improved O&O IntensiveOptimize
The new boot time optimization optimizes the system fully automatically even before Windows starts – so even locked system files and other critical files can be reliably accelerated.
With the revised O&O IntensiveOptimize, demanding users can also optimize their system in their own Windows environment – with full access to all user and system files. Thanks to the improvements in version 31, a single mouse click is now enough, even for Bitlocker-encrypted drives.
My individual O&O Defrag
O&O Defrag 31 also gives you the opportunity to choose your own personal defragmentation strategy. In the classic view, you can make all professional settings yourself.
In O&O Defrag 31, you can switch at any time between the classic view with all professional settings and the modern view, which is reduced to the essentials.
System maintenance of your data carriers
O&O Defrag 31 checks your hard drive or SSD for inconsistencies that can lead to problems. It examines the component memory and Windows system files for errors.
O&O Defrag will show you whether and which errors have been found after the check has been completed. With the repair function, most errors can be fixed directly.
Remove ballast and free up space
Over time, more and more ballast accumulates on a PC. Temporary files, internet cache and the like can take on considerable proportions. This can lead to a storage space problem, especially on modern SSDs. But backups also take much longer than necessary.
With the improved O&O DiskCleaner in O&O Defrag, you can put an end to files that are no longer needed.
Remove superfluous programs
Programs that are no longer in use can pose a security risk. Definitely, they are wasting disk space. You probably won’t need a 2011 tax filing program anymore. But do you even know it’s still installed?
O&O Defrag 31 now clearly displays all installed programs. And with one click, you can easily uninstall the ones you no longer need. This saves storage space (important for SSDs) and increases your security.
Automatic defragmentation in the background
The automatic defragmentation optimizes your data carriers in the background without negatively affecting your computer’s performance. O&O Defrag can be set up so that defragmentation starts automatically at a certain level of fragmentation, on certain days of the week, or whenever your screensaver is active.
Native support for the ARM platform
For the first time, O&O Defrag 31 now supports the family of CPUs based on the ARM architecture (Advanced RISC Machine) in addition to the previous Intel and AMD processors. These are currently mainly used in new Windows PCs with AI support and will take a significant market share in the coming period due to their energy efficiency and lower costs.
O&O Defrag ensures maximum drive performance at all times
Intelligent optimization technology adapts to the type of drive and keeps systems reliably fast, whether in daily office operations or under heavy load. With comprehensive automation functions, detailed analyses and proven optimization methods, O&O Defrag offers full control and measurable performance benefits – for individual workstations as well as for professional IT environments.
Automatic Drive Optimization
– Fully automatic defragmentation of classic hard drives (HDD)
– SSD-optimized procedures without unnecessary write access
– Automatic detection of drive type (HDD / SSD)
– Separate optimization of system and data drives
– Long-term performance maintenance without manual intervention
Powerful defragmentation methods
– Multiple optimization strategies for different requirements
– Contiguous storage of fragmented files
– Consolidation of free storage areas
– Reducing future fragmentation
– Optimization of folder and directory structures
– Improved access times to frequently used files
Automation & Background Operation
– Fully automatic background operation
– Start of optimization when the system is idle
– Time-controlled optimizations according to schedule
– Event-based execution on inactivity
– Automatically pause on user activity
– Individual time windows per drive
Offline & Boot-Time Optimization
– Optimization of locked system files before Windows starts
– Processing files that are not accessible during operation
– Scheduled offline optimization with automatic restart
– Particularly effective in highly fragmented systems
Resource and system conservation
– Low-priority defragmentation
– Intelligent control of CPU and I/O load
– No impact on running applications
– Optimization only with sufficient system resources
– Optional deactivation on battery power
Analysis & Transparency
– Detailed analysis of the fragmentation state
– Clear display of all drives
– Display of last and next optimization operations
– Logging of all optimization jobs
– Traceable history of all measures
User-friendly operation
– Single interface for all drives
– One-click optimization with recommended settings
– Automatic mode for maximum simplicity
– Advanced Expert Options for Power Users
– Clear status indicators and understandable feedback
Drive & File System Support
– Optimizing NTFS Volumes
– Internal and external drive support
– Suitable for large disks and many files
– Optimal management of large file structures
– Security & Stability
– Gentle optimisation processes
– File System Integrity Protection
– Clean cancel on restart or shutdown
– Continuation of interrupted optimizations
– Stable continuous operation on productive systems
Optimization for different application scenarios
– Ideal for office and workstation computers
– Optimizes workstations with large project files
– Suitable for systems with SSD and HDD combinations
– Long-term performance stability for archive and data drives
Product highlights
- “Install & That’s All”: After installation, no further settings need to be made; the program selects the defragmentation method that is suitable for the system and applies it.
- SOLID/Quick: This method, developed specifically for SSDs, performs a superficial optimization of the SSD, for example by deleting the free storage space. This method is gentler and faster.
- SOLID/Complete: This method, developed specifically for SSDs, is used to thoroughly optimize the SSD.
- ClusterView for SSDs: In order to show the degree of fragmentation of an SSD, the ClusterView now shows the logical structure of an SSD, correspondingly 6 blocks are combined into one
- O&O DiskCleaner – Searches and removes temporary and unnecessary files that consume disk space and increase fragmentation
- Fragment filter to identify the most fragmented files on a drive
- Optimization of systems with thin provisioning
- Time history shows which defragmentation action led to which optimization success
- Easy to use – suitable for beginners to professionals
- Even faster system and program starts
- Duration of defragmentations reduced
- Defragmentation of locked files
- Check&Repair: Checking and repairing a recovery environment
- O&O IntensiveOptimize: Bitlocker support
- Efficiently prevents renewed fragmentation
- Extends the lifespan of the hardware
- Faster internet surfing
- Increases the chance of recovering lost data
- Speeds up backup and restore operations
- Defragmentation of your PC at the push of a button
- Supports Windows 11 and 10 (64-bit)
Release Notes:
The primary additions and improvements in this major release include:
Core Optimization & Engine Updates
- Completely Overhauled Engine: Rebuilt from the ground up for faster, more stable, and highly efficient background operation while reducing overall system load.
- Native ARM Support: Added native support for Windows PCs running ARM processors (in addition to Intel and AMD architectures).
- Expanded OS Compatibility: Fully optimized for the latest operating systems, including Windows 11 25H2 and Windows Server 2025.
Interface & Navigation Redesign
- Modern vs. Classic View: The user interface has been entirely modernized to match the design style of Windows 11, giving users “one-click” access to automatic optimization. Experienced users can still toggle back to the “Classic View” for deep, professional tweaks.
SSD, NVMe, & Encryption Features
- O&O VisualDisk: A newly redesigned feature that visually charts write access to SSD and NVMe drives. This helps you track and minimize unnecessary background write cycles, extending your flash drive’s overall lifespan.
- IntensiveOptimize & BitLocker: The IntensiveOptimize tool (which reboots the PC into an isolated, safe Windows environment to defrag heavily locked files) now fully supports drives encrypted with BitLocker.
- Enhanced S.M.A.R.T. Health Indicators: An improved drive health tracker identifies potential hardware failures early.
- Check&Repair for Recovery Environments: The software now checks and fixes corrupted Windows Recovery Environments (which are vital for running out-of-OS optimization like IntensiveOptimize).
New & Integrated System Tools
Version 31 steps beyond standard defragmentation by integrating several maintenance utilities directly into the application layout:
- O&O StartupManager: Detects and clears out broken, orphaned, or slow startup entries, tasks, and background services to speed up Windows boot times.
- O&O AppBuster: Integrated into the layout to help completely purge unwanted bloatware, pre-installed desktop software, and hidden Microsoft Store apps.
- O&O DiskCleaner: Upgraded background data-cleaning utility to safely wipe temporary files and redundant cache files before you begin a defrag or TRIM cycle.
The software continues to focus on improving PC performance by reorganizing fragmented files, offering specific optimization methods for SSDs (like SOLID/Quick and SOLID/Complete), and adapting to usage patterns (e.g., pausing on notebooks when running on battery).
