Software & Apps Backup & Utilities 106 106 people found this article helpful 8 Best Free Disk Space Analyzer Tools Free software for finding the largest files on a hard drive by Tim Fisher VP and General Manager, Lifewire.com Tim Fisher has 30+ years' professional technology experience. He focuses on support and Microsoft topics but is an expert in all areas of tech. He's also the VP and General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated on August 02, 2021 reviewed by Chris Selph Lifewire Tech Review Board Member Chris Selph is a CompTIA-certified technology and vocational IT teacher. He also serves as network & server administrator and performs computer maintenance and repair for numerous clients. our review board Article reviewed on Feb 16, 2020 Chris Selph Tweet Share Email Backup & Utilities File Types Apps Windows MS Office Linux Google Drive Backup & Utilities Design Cryptocurrency View More Ever wonder what's taking up all your hard drive space? A disk space analyzer tool, sometimes called a storage analyzer, can scan your computer and then generate a report detailing everything that uses disk space—like saved files, videos, program installation files, and more. Use one of these free disk space analyzer tools to figure out why your hard drive, flash drive, or external drive is filling up. Some of these analyzers even let you remove files directly from the program. 01 of 08 Disk Savvy What We Like Easier to use than most disk space analyzers. Categorizes files in several ways. Regular updates to newer versions. Scan multiple locations simultaneously. Export results to a report file. Works within File Explorer. What We Don't Like Some features require the paid Pro edition. Only 500,000 files per scan. Our Review of Disk Savvy We list Disk Savvy as the No. 1 disk space analyzer program because it's user-friendly and full of useful features that will help you free up disk space. With Disk Savvy, you can analyze internal and external hard drives, search through the results, delete files from within the program, and group files by extension to see which file types use the most storage. You can also examine a list of the top 100 biggest files or folders and export the list to your computer to review later. There's a professional version of Disk Savvy available, too, but the freeware version seems perfect. Install Disk Savvy on Windows 10 through Windows XP, as well as on Windows Server 2016, 2012, 2008, and 2003. Download Disk Savvy 02 of 08 Windows Directory Statistics (WinDirStat) What We Like Scan a whole drive or a single folder. Provides unique ways to visualize disk space. Can configure commands to delete data. What We Don't Like Unable to save scan results to a file you can open later. A bit slower at scanning than similar tools. Runs only on Windows. Our Review of WinDirStat WinDirStat ranks up there with Disk Savvy in terms of features; we're just not too fond of its graphics. Create your own custom cleanup commands to do things quickly, like moving files off the hard drive or deleting files of a certain extension in a selected folder. You can also scan different hard drives and folders at the same time, as well as see which file types use the most space. Install WinDirStat only in the Windows operating system. Download WinDirStat 03 of 08 JDiskReport What We Like Shows disk space usage in five perspectives. Interface is ideal for new users. Works on Windows, macOS, and Linux. What We Don't Like Doesn't let you delete files from within the results. Noticeably slower than other disk space analyzers. Another free disk space analyzer, JDiskReport, displays file storage in list view or via a pie chart or bar graph. A visual of disk usage helps you understand how the files and folders behave in relation to the available space. In the left pane of JDiskReport, you'll find the folders that were scanned, while the right pane displays ways to analyze that data. You can't delete files from within the program, and the time it takes to scan a hard drive seems slower than some of the other applications in this list. Windows, Linux, and Mac users can use JDiskReport. Download JDiskReport 04 of 08 TreeSize Free What We Like Lets you remove files from within the program. Scan individual folders and entire hard drives. Supports internal and external hard disk drives. Portable option available. What We Don't Like Doesn't work on Linux or macOS. Filtering options aren't super helpful. No unique perspectives are available as with similar tools. Our Review of TreeSize Free The programs mentioned above are useful in different ways because they provide a unique perspective for you to look at the data. TreeSize Free isn't so helpful in that sense, but it lets you see which folders are largest and which files among them are using up most of the space. If you find folders or files that you no longer want, delete them from within the program to free up that space. Get a portable version that runs on external hard drives and flash drives without installing it to the computer. Only Windows can run TreeSize Free. Download TreeSize Free 05 of 08 RidNacs What We Like Minimal and simple interface. Portable option available. Scans large files in a specific folder or the whole drive. What We Don't Like Won't run on Linux or macOS. Missing advanced features found in similar applications. RidNacs is for the Windows OS, and while it's similar to TreeSize Free, it doesn't have all the buttons that may drive you away from using it. Its clear and simple design makes it more appealing to use. Scan a single folder with RidNacs or scan whole hard drives. This is an important feature in a disk analyzer program because scanning an entire hard drive may take a long time when you really just need to see the info for one folder. Open the folders as you would in Windows Explorer to see the folders or files listed in descending order. RidNacs includes the basic features necessary for what a disk analyzer should have, but it lacks the features you'd find in a more advanced program such as WinDirStat. Download RidNacs 06 of 08 Disktective What We Like Portable. Scans large files in a specific folder or the whole drive. Provides two ways to view disk space usage. Export the results to a file. What We Don't Like Unable to delete files directly from the program. Exported results are hard to read. Only Windows users can install. An update hasn't been released since 2010. Disktective is another free disk space analyzer for Windows. This one is portable and takes up less than 1 MB of disk space, so you can carry it with you on a flash drive. Each time Disktective opens, it asks what directory you want to scan. You can choose any folder on any hard drive that's plugged in, including removable ones, as well as the entire hard drives. The left panel of the program shows the folder and file sizes in a familiar Windows Explorer-like display, while the right side displays a pie chart for visualizing each folder's disk usage. Disktective is relatively user-friendly, but it's hindered by a few key limitations: the export-to-HTML feature doesn't produce a very easy-to-read file, you can't delete or open folders or files from within the program, and the size units are static, meaning they're all either in bytes, kilobytes, or megabytes (whatever you choose). Download Disktective 07 of 08 SpaceSniffer What We Like Results can be filtered several ways. Results can be backed up and opened again without rescanning. Delete files from inside the program. Report of large files can be saved to a text file. Completely portable. What We Don't Like Can be hard to grasp at first. Works only on the Windows operating system. Most of us are used to viewing the data on our computers in a list view; however, SpaceSniffer uses blocks of varying sizes to demonstrate folder and file sizes. Right-clicking any folder or file in SpaceSniffer opens the same menu that you see in Windows Explorer, meaning you can copy, delete, and perform other file functions. The filter feature lets you search through the results by file type, size, or date. You can export the results to a TXT file or a SpaceSniffer Snapshot file. Download SpaceSniffer 08 of 08 Folder Size What We Like Integrates with Windows Explorer. Sort folders by size. Extremely user-friendly. What We Don't Like Shows results in an extra window instead of the window you're viewing. Runs only on Windows. This disk space analyzer is useful since Windows Explorer only provides the size of the files, instead of the size of the folders. With Folder Size, you can see the size of each folder in a small window. In this window, you're able to sort the folders by size to see which ones use the most storage. In the Folder Size settings, you can disable CD and DVD drives, removable storage, or network shares. The Folder Size interface is nothing like the other analyzers in this list. If you don't need charts, filters, and advanced features, and only want to sort folders by size, this program will do just fine. Download Folder Size Was this page helpful? Thanks for letting us know! Get the Latest Tech News Delivered Every Day Email Address Sign up There was an error. Please try again. You're in! Thanks for signing up. There was an error. Please try again. Thank you for signing up. Tell us why! Other Not enough details Hard to understand Submit