1Tree Basic lets you quickly see/get all drives/directories/files size in 1 tree view, so as to let you to do the manual disk cleaning work easily.

1Tree Basic loads your local and network drives, folders and files with their sizes (sorted by size in descending order), and provides you with the common commands (e.g. Delete, Move to, Rename) and a few special commands (e.g. Get Full Path of Resource) for drives/files/folders. So, with 1Tree Basic, you can do the manual disk cleaning work easily.

In fact, it is similar to UNIX/Linux du command, or you can think it is a GUI du tool for Windows.

Limitation of Trial Version

You can only see the resources size for top 4 levels.

# Recommend You Run It as Administrator on Vista+

Though it can work under Windows Vista+ without UAC prompt, but we still recommend you run it as Administrator on Vista+ to get the size of more system resources. If you have not the permission to count the size of the resource, 1Tree Basic will display its size as "Cannot Compute Size".

# Register License

If you have paid the license fee, you will get the license key INSTANTLY via email!
Please click 'Input License Key' menu item under <Gets your license.> button on the main interface to input or paste the license key EXACTLY as shown in your license email.
Note: if registered successfully, you can find your license information on the "About..." interface.

# Retrieve License Key

Lost the license key? Don't worry. It's easy to retrieve your license key of 1Tree Basic. Just click 'Retrieve License Key' menu item under <Gets your license.> button on the main interface.

# See Resource Size

After started, 1Tree Basic will load all drives and the first level resources of the smallest size used drive. Clicking a resource (drive/folder) will load its first level resources (files/folders).
Also, you can see the size tree for the remote computers by the mapped network drives (do not forget turn on the related switch on the Preferences interface).

# Perform Operations

And you can perform some operations for the selected resource (drive, folder and file) by clicking toolbar buttons or context menu items, such as Permanently Delete, Move to Recycle Bin, Copy to, Rename, Move to, Copy Full Path, Run, Open and Display Property.

# Set Preferences

1Tree Basic also provides you with a few options to customize the interface, such as Tree Font, Toolbar Location and Data Separator (splits the name and size for each resource), Show CD / Network Drive(s). And you can preview the effect for Tree Font and Toolbar Location options before save them.
Download Download v4.0 for Microsoft® Windows®, 320 KB, Updated at Oct 15, 2015

BitsDuJour's Review

QuoteQuickly Visualize Directory Sizes in Tree View

Sure, you'd like to free up some hard drive space by getting rid of some of your larger folders, but finding the worst offenders can be tedious. Short of checking the properties for each and every directory in your system, what can you do? Well, it all starts with today's discount software promotion, 1Tree Basic!

1Tree Basic makes it easy to quickly see the sizes of all of your directories in a convenient tree view, making it a simple task to recapture disk space. With 1Tree Basic, not only will you see your drives, folders, and files sorted by size, you'll also be able to use some of the most common commands like Delete, Recycle, Copy, Move, and more. You'll enjoy a plethora of different view options, including showing the size of folders, sorting by size, and copy full path.

Like all outstanding software, 1Tree Basic lets you customize the interface and shortcuts to match the way that you work. Deploy desktop and quick launch icons for quick and easy access. Change the font that your tree displays. Or, you can elect to have 1Tree Basic run in Autostart mode, so you'll always have it ready and waiting for you!

Software Guy's Review

QuoteNice interface and handles most basic file manipulations (move, copy, delete...).

File sizes and folder sizes displayed is very handy-particularly folder size for burning dvds. Would like to see checkboxes for bulk file moves where the selected function is performed on the selected files.

TriSun is providing lifetime upgrades which is very good. If you need file size info and folder size info up front, this is a good choice for a basic file manager.

Softpedia's Review

Quote1Tree Basic is a handy and reliable application designed to enable you to quickly get the sizes of all directories/folders in one tree.

The program features a simple interface which allows you to browse your hard drive, delete large files or relocate them to other partitions with minimum effort.
Download Download v4.0 for Microsoft® Windows®, 320 KB, Updated at Oct 15, 2015

Update History

Release/Update Date
Features / Improvements Bug Fixes
Oct 15, 2015
  • Important: perfected UI effect for any system DPI setting, in any supported Operating Systems (system DPI setting: in Windows 7, it can be changed at "Control Panel -> Appearance and Personalization -> Display -> Make text and other items larger or smaller").
  • Important: supports Windows 10.
  • Important: uses Golden Ratio for the start position of the main and splash interfaces.
  • Optimized internal efficiency.
  • Optimized the definition of some icons/images.
  • Redesigned the licenses.
  • Optimized Help menu.
  • Optimized software texts.
  • Beautified About interface.
Jan 27, 2014
  • Can open any resource by using double-click, previous versions can only open file.
  • Uses new domain name ( for 1Tree products.
  • After did Move to Other Place, Permanently Delete or Move to Recycle Bin operation, the resource tree may not be updated if there is exception.
  • After pressed <Enter> on the system dialog boxes, the selected resource will be opened.
Dec 26, 2013
  • Added feature: can rename the selected resource.
  • Added feature: can run/open the selected resource by using the <Enter> key.
  • Added options: show the network / CD drive(s).
  • Uses the specific icon for the network drive(s).
  • Displays the right label for the network drive(s).
  • Sorts drives by used size, not the total size.
  • Uses the thousands separator in size.
  • Prompts you to refresh whole resources tree after registered, else you will not see the 5+ levels size.
Dec 14, 2013 (Update)
  • A little interface problem on Options window (hidden text).
Nov 26, 2013
  • Changed the portable package to the installer.
  • Does not use SQLite to save user settings, greatly reduced the installer size.
  • Optimized the structure of internal resources, also reduced the installer size.
  • Beautified/Optimized the text and images of software and webpage.
Feb 29, 2012
  • Supports context menu.
  • Supports reloading the selected resource.
Sep 26, 2011
  • Displays prompt when loading resources.
Nov 15, 2010
  • Supports specifying data separator (splits the name and size for each resource).
  • Supports moving resources to the Recycle Bin.
  • Does not check if the resources are stored in ROM drive when executing 'Delete' and 'Move to' operations.
May 23, 2010
  • Now can get the full path of the selected resource.
Oct 27, 2009
  • Does not create desktop and quick launch icons automatically, but made them as options.
  • Does not reload the target folder after did 'Copy to Folder' command.
Feb 12, 2009
  • New release.
Download Download v4.0 for Microsoft® Windows®, 320 KB, Updated at Oct 15, 2015

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Subject: Recommend software - 1Tree Basic: quickly see folders size in 1 tree! (from 'your name here')


I'm using 1Tree Basic, it's a cute Windows tool that enables you quickly see folders size in 1 tree view, so as to let you to do the manual disk cleaning work easily.

You should have a test!

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Direct download:
Download Download v4.0 for Microsoft® Windows®, 320 KB, Updated at Oct 15, 2015