Top 6 Best Free Disk Space Analyzer Tools in 2024

Export Folder Tree and List


We have tested and ranked the top free disk space analyzer tools for Windows. We ranked the storage analyzers below from best to worst based on their performance, features, and precision. You can use them to get detailed disk usage statistics. Scan your hard drive, flash drive, external drives, or network shares.

In today’s digital age, managing disk space has become increasingly important. We accumulate vast amounts of data from various sources. Whether it’s personal files, work documents, multimedia content, or system files. Our storage devices can quickly fill up, leading to performance issues and storage constraints. Disk space analyzer tools offer a solution to this problem. Use them to get insights into how disk space is utilized. Therefore, allowing you to identify and manage large files, duplicate content, and unnecessary clutter.

Managing disk space properly in modern computing environments is very important. Solve the challenges associated with storage constraints. Use effective tools to analyze and optimize disk usage. Additionally, learn how to use disk space analyzer tools to maintain optimal storage efficiency. Prepare for a comprehensive exploration of disk space analyzer tools and their benefits.

List of the top disk space analyzer tools from best to worst:

  1. Folder Size
  2. Windows Disk Space Analyzer
  3. WindirStat
  4. SpaceSniffer
  5. Disk Space Scanner
  6. DUA (Disk Usage Analyzer)

1. Folder Size

Folder Size Five Stars Rating


Folder Size won our Best Free Disk Space Analyzer Award. It is the best tool on this list and outperforms all others in terms of performance, features, and precision.

It can analyze disks, external drives, network shares, NAS devices, and enterprise storage systems. You are provided with multiple disk usage analysis and file classification features. That lets you easily visualize how the disk space is used, save reports, and perform file management operations.

Disk Space Analyzer

Best Free Disk Space Analyzer

Folder Size is a powerful tool designed to help you efficiently manage your disk space. You can analyze folder and file sizes on your hard drives and network. Also, you can easily visualize the distribution of disk space usage. In addition, you can identify the largest folders and files. As a result, pinpoint which files or folders are consuming the most space on your drive.

Fast Performance

One of the standout features of the tool is its speed and efficiency. The application utilizes optimized scan algorithms to quickly scan your entire hard drive or a specific folder. Therefore, providing you with detailed information on folder sizes and file sizes in just a matter of minutes. This makes it ideal for users who need to quickly identify and clean up disk space.

Detailed Disk File and Folder Information

Additionally, the Folder Size disk analyzer offers a variety of useful features to enhance your disk space management experience. You can view file and folder sizes in various charts, including bar charts and pie charts. In addition, you can access detailed information such as creation time, last modification time, file count, and subfolder count.

Disk Usage Analysis and Reports

The tool also provides handy reports to help you find the largest files. Of course, as it lists folder sizes you can view the largest folders too. There are also the oldest files and folders, the newest files and folders, and more. The longest file names and longest file paths reports will let you fix issues related to the Windows 260 characters per path. The features to find empty files and folders will let you clean and get rid of useless clutter. By deleting empty files and folders you will not gain extra disk space, but those useless items may slow down other applications.

Disk Space Analyzer Bar Chart

Show Disk Usage Bar Chart

Save and Export Disk Usage Information

Folder Size can store the current disk space analysis in a file which you can load later to see how your disk usage has changed. You can also export folder lists or trees to XML and CSV files. You can also export or copy file names or file lists to Microsoft Excel. Last but not least there are plenty of options to print folders and reports. You can print them to a printer or various file formats including PDF,

Lightweight Disk Analysis

Furthermore, this drive space scanner is extremely user-friendly and lightweight. That ensures that it does not impact the performance of your system. It does not install any services, file hooks, or shell extensions, and it will not cause any issues or slow-downs. The intuitive Explorer-style interface makes it easy to navigate through your file system. In addition, perform actions such as deleting folders or files. You can also open files with associated applications, and remove items from the list.

Overall, Folder Size is a valuable utility for anyone looking to effectively manage their disk space. It will let you keep your system running smoothly. Whether you’re a casual user or a power user, this tool offers plenty of features. It will let you organize and optimize your storage space with ease.


Compatible with Windows 11/10/8.1/8/7/Vista (Both 32 & 64 Bit)

2. Windows Disk Space Analyzer

Windows Disk Space Analyzer Four Star Rating

Rating : GOOD

Windows 10 and 11 offer a built-in storage usage tool that can assist. It doesn’t boast the robust functionality of traditional disk space analyzers. Nevertheless, it does offer some similar features that may prove useful.

Accessing this tool is straightforward. Simply navigate to Settings, then select System, followed by Storage. Then, choose the drive you wish to analyze. You’ll be presented with a comprehensive breakdown of what is occupying space on that drive. Those are ranging from applications and games to system files, videos, photos, and music. By clicking on a specific category, Windows will offer suggestions for items you can remove. For instance, you’ll find a list of installed applications that can be sorted by the space they occupy.

This native Windows tool may not offer the advanced features found in third-party disk space analyzers. Nevertheless, it can serve as a convenient option for quickly grasping disk usage and reclaiming storage space when needed. You can perform a swift cleanup or gain insight into your disk usage on the fly. Certainly, this tool provides a handy solution for managing storage resources within Windows 11 and 10.

Windows Disk Space Analyzer

Windows Disk Space Analyzer

Windows Disk Space Vanalyzer is available in your default Windows installation and you do not need to download or install it.

3. WindirStat

WindirStat Three Star Rating

Rating: Average

Are you struggling with disk space on your Windows system? It’s time to bring in WinDirStat, the ultimate disk usage statistics viewer and cleanup tool designed to help you reclaim valuable storage space on your PC. Whether you’re using Windows XP, Vista, 7, 8, or 10, WinDirStat has got you covered.

But what if you’re a Linux or MacOS X user? Fear not, there are alternatives like KDirStat for Linux and Disk Inventory X or GrandPerspective for MacOS X users. Each of these tools serves the same purpose of providing insights into your disk usage and helping you clean up unnecessary files.



Key Features of WinDirStat

Upon startup, WinDirStat performs a comprehensive scan of your entire directory tree, allowing you to visualize your disk usage in three distinct views:

  1. Directory List: Similar to the tree view in Windows Explorer, but sorted by file/subtree size, making it easier to identify which files and folders are taking up the most space.
  2. Treemap: This innovative visualization tool presents the entire contents of your directory tree in one glance. It represents each file by a colored rectangle, with the size of the rectangle proportional to the file’s size. It represents directories by larger rectangles containing their files and subdirectories, giving you a clear overview of your disk space usage.
  3. Extension List: Acting as a legend, the extension list provides valuable statistics about file types, helping you understand which types of files are consuming the most space on your disk.


The Treemap while praised by some could be a real pain to read and understand. Looking at the pie and graph charts of the top disk analyzers is way easier. The lack of the largest files and largest folder reports makes it hard to locate the missing disk space. The user interface is quite archaic from the ages of Windows 95.

How WinDirStat Works

The treemap feature is particularly noteworthy, as it offers a unique and intuitive way to visualize disk usage. Each colored rectangle represents a file, with its size directly correlated to the file’s size. By organizing files into rectangles, WinDirStat effectively showcases the directory structure, making it easy to identify large files and folders at a glance.

Moreover, the color of each rectangle corresponds to the type of file, as indicated in the extension list. This visual representation allows you to quickly identify which types of files are dominating your disk space.


With WinDirStat, taking control of your disk space has never been easier. Its intuitive interface and powerful visualization tools empower you to identify and remove unnecessary files, freeing up valuable space on your Windows system. Whether you’re a casual user or a power user, WinDirStat is an essential tool for maintaining a clean and organized disk.

Download: WinDirStat today and say goodbye to disk space woes!

4. SpaceSniffer

SpaceSniffer Three Star Rating

Rating: Average

Are you tired of struggling with disk space issues on your Windows system? Say hello to SpaceSniffer, a freeWare and portable tool designed to help you understand and manage the structure of folders and files on your disks. With its intuitive Treemap visualization layout, SpaceSniffer provides immediate insight into the distribution of large folders and files across your devices.

SpaceSniffer Disk Space Analyzer


Key Features of SpaceSniffer

  • Intuitive Interface: SpaceSniffer offers a user-friendly interface that allows you to quickly grasp your disk space usage. Start a scan process and instantly see the overall situation, with larger elements representing bigger folders and files on your disk.
  • Detailed Analysis: Need more detail on a specific folder or file? Simply single click on it to reveal its contents. SpaceSniffer allows you to progressively delve deeper into your disk space, providing detailed information on selected elements.
  • Powerful Filtering: With SpaceSniffer, you can filter files based on various criteria such as file type, size, date, and more. Want to focus only on particular file types or exclude specific files? SpaceSniffer makes it easy with its flexible filtering options.
  • Tagging and Customization: Tag files with different colors for easy identification and perform filtering based on tags. Customize the layout, colors, and behaviors to suit your preferences and workflow.
  • Fast and Efficient: SpaceSniffer is fast and easy to use, with a smart caching engine that allows for smooth navigation even during the scan process. It reacts to file system events in real-time, keeping you informed about changes to your disk space.

Why Choose SpaceSniffer?

SpaceSniffer aims to be intuitive and straightforward, making it ideal for users who value simplicity and efficiency. Unlike complex statistical tools, SpaceSniffer offers a minimal interface that focuses on providing essential functionality without overwhelming users with unnecessary features.

The graphical effects, such as zoom in/out and blinking elements, enhance the user experience and help users understand what’s happening during the scan process. With support for drag and drop, customizable textual reports, and multiple views for different media, SpaceSniffer offers a comprehensive solution for disk analysis and cleanup.

Cons of SpaceSniffer

  • Lack of Detailed Reports: One of the notable drawbacks of SpaceSniffer is the absence of comprehensive reports. Unlike some competing tools, SpaceSniffer does not offer reports on largest folders and files, making it challenging to identify and manage storage-intensive elements effectively.
  • No Print Option: SpaceSniffer lacks a built-in print option, limiting your ability to create physical copies or share detailed analyses with others. Users who prefer to have hard copies of their disk space reports may find this omission inconvenient.
  • Inaccurate Results: Some users have reported inaccuracies in SpaceSniffer’s scan results, particularly in the size calculations of folders and files. This lack of precision can undermine users’ confidence in the tool’s ability to provide reliable disk space information.
  • Slow Performance: Despite its intuitive interface, SpaceSniffer may suffer from sluggish performance, especially when scanning large disks or complex directory structures. Users with extensive storage systems may experience delays or unresponsiveness during the scanning process.

While SpaceSniffer offers valuable features such as intuitive navigation and powerful filtering options, these limitations may impact its overall usability for users who require detailed reports, accurate results, and faster performance. It’s essential to consider these factors when evaluating SpaceSniffer for your disk analysis needs.


If you’re looking for a fast, easy-to-use, and efficient disk analysis tool, SpaceSniffer is the perfect choice. Its intuitive interface, powerful filtering options, and customizable features make it a valuable companion for managing your disk space effectively. It is a good addition to out list of best disk space analyzers. Download SpaceSniffer today and experience hassle-free disk analysis like never before!

Download: SpaceSniffer

5. Disk Space Scanner

Scanner Two Star Rating

Rating: Basic

Utilizing a sunburst chart, this tool illustrates the utilization of your hard disk or other storage media. The chart comprehensively displays all significant files and folders across various directory levels simultaneously. Each section provides information upon mouse-over, and you can click on any of the pie sections to redraw the pie, using it as the ‘root’.

Disk Space Scanner

Disk Space Scanner

Scanner by Steffen Gerlach is an interesting little tool. While you might like the sunburst type of disk visualization, it provides very limited features. The information is not visible at a glance and you have to hover the chart to display it. This is rather inconvenient and could be quite annoying.

There is no list of the folders and files or any kind of filtering options. There are no additional disk usage reports either. Overall it is an interesting tool. Unfortunately, its functionality is quite limited. If you are looking to view your disk space usage with a sunburst chart you might find it useful.

The tool is very archaic with its latest version 2.3 dating back to the year 2000. Yet it still works on Windows 11 and you can use it for free.

Download: Scanner

6. DUA (Disk Usage Analyzer)

Scanner Two Star Rating

Rating: Basic

DUA, short for Disk Usage Analyzer, is a tool that will let you effortlessly understand disk space utilization within a specified directory. By default, it operates in parallel, optimizing your SSD usage to swiftly deliver relevant information. Moreover, it offers the option to efficiently remove unnecessary data, accomplishing this task more swiftly than the traditional ‘rm’ command.

DUA - Disk Usage Analyzer

DUA – Disk Usage Analyzer

Dua (Disk Usage Analyzer) supports a variety of operating systems, giving you flexible options for analyzing and managing disk space. Here’s a detailed breakdown of the operating systems that Dua works with:

  1. MacOS:
    • You can install Dua on MacOS using different methods:
      • Via Binary Release: Download pre-built binaries for MacOS from the official releases section or install via MacPorts or Homebrew.
      • Via Cargo: Install Dua using Cargo, the Rust package manager, by running the appropriate command in the terminal.
  2. Linux:
    • Dua is fully compatible with Linux distributions, offering support for a wide range of systems. You can install Dua on Linux using Cargo or package managers specific to your distribution, such as apt for Debian-based systems (e.g., Ubuntu) or pacman for Arch Linux.
  3. Windows:
    • Dua supports Windows operating systems, allowing you to analyze disk usage on your Windows machine. Install Dua on Windows using Scoop, a command-line installer for Windows, or by compiling from source using Cargo.
  4. Other Platforms:
    • Dua is also compatible with other platforms, including FreeBSD and NetBSD. You can install Dua on these platforms using package managers specific to your operating system, such as pkgin for NetBSD or by compiling from source.

Overall, Dua offers cross-platform compatibility, enabling you to analyze disk usage and manage storage effectively across different operating systems. Whether you’re using MacOS, Linux, Windows, or other Unix-like systems, Dua provides a reliable and efficient solution for disk space analysis and management.

DUA Disk Space Analyzer Features and Limitations

Let’s delve into why there’s only one available backend for Dua. Previously, there was an option to use termion as a backend. However, maintaining both backends became more burdensome than it’s worth and added complexity that I didn’t find appealing anymore. While termion had its benefits, I was never fond of the fact that it seemed to have dropped out of support. As a result, crossterm emerged as the sole remaining backend, and it’s actively developed, ensuring stability and reliability.

However, it’s important to acknowledge some limitations of Dua:

  • It doesn’t display symbolic links if no path is provided when invoking Dua. To address this, symbolic links are currently pruned and not used as a root. They will be shown if they are not a traversal root but will not be followed.
  • Interactive mode may only look good in dark terminals, as highlighted in this issue.
  • File names in the main window are not truncated if they are too large, resulting in them being cut off on the right.
  • Certain examples in tests/fixtures may not render correctly in interactive mode due to graphemes not being interpreted correctly. This issue is particularly noticeable with Chinese characters, where column sizes are not accurately computed, leading to certain columns not being shown. Terminal discrepancies may also occur, such as with alacritty, which performs worse than iTerm3 in some cases.
  • In interactive mode, approximately 60MB of memory is required for 1 million entries in the graph.
  • The maximum amount of files in interactive mode is limited to 2^32 – 1 (u32::max_value() – 1) entries. This limitation is due to the underlying petgraph crate, which considers it unsafe to use u64. Although reaching this limit might result in undefined behavior, it has not been observed thus far.

DUA Conclusion

If you are familiar with consoles, scripting, and development then you might find DUA useful. Unless you are prepared for challenges you better stick with a tool from the top positions of our list. This tool is not fit for the average user and requires advanced skills. Even if you have such skills it is not worth the effort installing and using it. That is because it does not deliver anything special to the stage.

Download: DUA


We have tested and compared the top free disk space analyzers for you. Folder Size stands out as the fastest and the most feature-rich application of this kind and won our BEST DISK SPACE ANALYZER AWARD. Nevertheless, you can find different types of tools in our list. While some are good and others not that good, they might fit for particular use case.

Share your opinion in the comments and let us know which disk space analyzer is your favorite and why.

FAQ: Disk Space Analysis and Management

What is a disk space analyzer?

A disk space analyzer is a tool that scans your hard drive to show how disk space is being used. It provides a detailed breakdown of file and folder sizes, helping you identify large and unnecessary files to free up space.

How can I check my disk space?

To check your disk space in Windows, open File Explorer, select “This PC,” and view the space usage bars under each drive. For a more detailed analysis, use a disk space analyzer like Folder Size.

How do I analyze disk space in Windows 11?

In Windows 11, you can use the built-in Storage Settings:

  1. Go to Settings > System > Storage.
  2. Here, you’ll see a breakdown of disk usage. For a more comprehensive analysis, use Folder Size to see detailed information on file and folder sizes.

What is the fastest disk usage analyzer?

Folder Size is one of the fastest disk usage analyzers available. It scans your drives quickly, providing detailed reports on file and folder sizes, hidden files, and system files, often missed by other tools.

What is the purpose of a disk space analyzer?

The primary purpose of a disk space analyzer is to help manage and optimize your disk usage by identifying large, duplicate, or unnecessary files and folders, thus freeing up space and improving system performance.

How do I analyze my storage space?

To analyze your storage space, use a tool like Folder Size:

  1. Download and install Folder Size.
  2. Run the program and select the drive or folder you want to analyze.
  3. The tool will scan and display a detailed breakdown of disk usage, highlighting large and redundant files.

How does disk space affect performance?

Insufficient disk space can significantly slow down your computer. When your disk is nearly full, it limits the operating system’s ability to manage files and use virtual memory efficiently, leading to slower performance and system instability.

Why is 100% of disk space being used?

100% disk space usage can be due to several reasons, such as:

  • Large files or programs take up space.
  • Hidden system files and backups.
  • Temporary files and caches. Using Folder Size, you can identify and remove unnecessary files to free up space and improve performance.

5 thoughts on “Top 6 Best Free Disk Space Analyzer Tools in 2024

  1. SpaceSaver99

    This article was a game changer for me! I had no idea that my hard drive was so cluttered with unnecessary files and hidden data. Using the disk space analyzer tool recommended here, I was able to quickly identify and remove a ton of junk files. The tool’s detailed breakdown of disk usage made it easy to see where my space was going and helped me free up several gigabytes. The instructions were clear and easy to follow, even for someone like me who isn’t very tech-savvy. Highly recommend this tool to anyone struggling with disk space!

  2. OrganizedOlivia

    I can’t thank you enough for this article! My computer was running out of space, and I couldn’t figure out why. The disk space analyzer tool mentioned here worked like a charm. It found all the hidden files and folders that were eating up my storage. I particularly loved the visual representation of disk usage, which made it easy to understand where the problem areas were. After following the steps, my computer is now running smoothly with plenty of free space. This article was a lifesaver!

  3. TechieTom

    As a tech enthusiast, I always look for ways to optimize my system, and this article hit the nail on the head. The disk space analyzer tool is incredibly powerful and user-friendly. It revealed a lot of hidden files that were not visible in the regular file explorer, including system volume information and backup files. The detailed guide provided in the article made it super easy to clean up my disk and recover valuable space. Kudos to MindGems for such a thorough and helpful piece!

  4. CleanUpQueen

    I’ve been struggling with low disk space for months, and this article provided the perfect solution. The disk space analyzer tool is fantastic! It gave me a detailed overview of what was taking up space on my hard drive, including hidden and system files that I couldn’t see before. The tool’s interface is intuitive, and I was able to clean up my disk within minutes. The step-by-step instructions in the article were clear and easy to follow. I now have plenty of free space, and my computer is much faster. Thank you, MindGems!

  5. EfficiencyExpert

    This article is incredibly helpful! I had no idea that so much of my disk space was being wasted on hidden files and unnecessary data. The disk space analyzer tool recommended here is top-notch. It quickly scanned my entire hard drive and provided a detailed breakdown of space usage. I was able to locate and delete large files and folders that I didn’t even know existed. The visual charts and easy-to-understand interface made the whole process a breeze. My computer is now more organized and efficient than ever. Highly recommend reading this article and using the tool!

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