TreeSize

Overview

TreeSize is a Windows desktop tool for finding what is consuming storage across files and folders, from local disks to network and cloud locations. It best suits Windows users who need more than a basic disk scan, particularly IT teams and consultants who need reporting or recurring analysis. Its range of editions is a strength, but server and business use make choosing the right license essential.

All editions run on-premise; JAM Software says scan data stays on the computer or site and is not shared with third parties. That is a useful fit for organizations that want storage analysis without sending data to an external service. For more options, see our Disk Space Analyzers list.

Key features

See what occupies storage

TreeSize analyzes files and folders on local drives, network shares, cloud storage, USB drives, SD cards, and external hard drives. Treemaps help reveal large space users visually, while file-type breakdowns show which kinds of content account for storage use. Together, these views make it easier to decide whether to investigate a particular folder or a class of files.

Reports, automation, and cleanup

Exports can include PDF, Excel, CSV, HTML, and SQLite, with formats depending on edition. Professional adds custom PDF, Excel, and HTML exports, along with command-line parameters, task scheduling, scheduled scans, and automated reporting. Those tools make it the more practical choice for IT staff who need repeatable storage checks rather than occasional manual scans.

TreeSize also supports deleting, moving, bulk renaming, archiving, duplicate finding, and deduplication. These actions give users ways to act on findings, though the free edition's non-commercial restriction rules it out for workplace cleanup. Storage integrations listed for the product include SharePoint, Google Drive, Amazon S3, Microsoft Azure, Outlook, Linux via SSH, and mobile MTP/WebDAV.

Pricing

TreeSize is freemium, with a free edition and trials for paid products. TreeSize Free costs nothing, but is limited to private, non-commercial use on Windows desktop systems and cannot be used on Windows Servers. It is a reasonable starting point for personal storage checks, not a no-cost option for business or server administration.

TreeSize Personal is billed annually at 20.40 € per user and offers a 14-day free trial. Aimed at advanced users, smaller businesses, and freelancers, it adds a largest-files filter, duplicate-file search and deduplication, and comparison of disk usage over time. A perpetual model is also available, but no price is stated for it.

TreeSize Professional is billed annually from 40.80 € per user, with a 14-day free trial. It is aimed at IT professionals managing storage in-house and adds command-line and task-scheduler options, automated work, and custom exports alongside disk-space analysis and large-file and duplicate finding. It supports Windows server scans; Free does not. Certain Professional plans offer unlimited user licenses, making it a more suitable business choice, though the per-user starting price and plan selection matter when licensing a team.

The Consultant License is billed annually at 240.00 € per user, also with a 14-day free trial. Its multiple-client and portable-use provisions, reusable reporting, and automation target consultants and service providers who work across customers; it is not the economical fit for a single personal device. SpaceObServer Enterprise is billed annually at 504.00 € per instance and has a 45-day free trial. It is aimed at businesses managing large or distributed networks, rather than individuals or small one-off scans.

Platforms

The listed desktop editions run on Windows Desktop. TreeSize can scan local and external storage as well as network shares and cloud storage, but the breadth of scan targets does not make it a cross-platform desktop application. Windows Server scanning requires Professional; Free is explicitly excluded from Windows Servers.

Who it's for

TreeSize Free suits private Windows users who want a no-cost view of disk usage and do not need server scans or commercial use. Personal is a better fit for advanced individual users and freelancers who value duplicate handling or change-over-time comparisons. Professional is the clear step up for IT staff needing server support, scheduled analysis, and tailored reports; consultants working across clients have a license aimed specifically at that workflow. Large or distributed environments should consider SpaceObServer Enterprise, while anyone who needs a macOS or Linux desktop app should look elsewhere.

Pros and cons

• Pros: Broad scan targets cover local, removable, network, and cloud storage, so analysis need not stop at a single drive.
• Pros: Treemaps, file-type breakdowns, and multiple export formats serve both visual investigation and report sharing.
• Pros: Professional adds server scanning and scheduled, automated reporting for recurring IT work.
• Pros: On-premise operation and the stated no-third-party-sharing policy suit privacy-conscious users and organizations.
• Cons: Free is restricted to private, non-commercial desktop use and cannot scan Windows Servers, so it is not a business workaround.
• Cons: Listed desktop editions are Windows-only, excluding users seeking a native macOS or Linux desktop tool.
• Cons: Edition and license distinctions complicate buying: server scans and business use require more than Free, while consultant and enterprise options target specialized needs.

Alternatives

Choose WizTree if you want a freemium alternative that supports macOS as well as Windows; its $25 a month Individual Supporter Code is a perpetual personal-use license, and supporter codes do not expire.

FolderSizes is another Windows freemium option; its Personal Edition license is $30, paid once for personal and home-network use, but is unavailable to organizations and includes lower-priority support.

SizeTrend offers a Windows free tier with local-analysis features, including drive and folder scans, cleanup and storage recommendations, and file, content, and duplicate analysis; consider it for a free local-analysis alternative.

Disk Analyzer Pro has a free personal edition for local-drive usage reports, deleting unwanted files and folders, and viewing duplicate-file reports, with both macOS and Windows support.

StorageRadar is a macOS freemium option with a free tier; choose it if you need a Mac-focused alternative.

Drive Atlas supports Linux and Windows and offers a free tier covering the first two drives with all features and no card or timer, making it an option for users on those platforms.

Disk Auditor is a free Windows tool distributed as a portable single executable, with disk scanning, visualization, and exports to CSV, TSV, JSON, Excel, and plain text.

LumaDisk is another freemium alternative for macOS and Windows.

Verdict

TreeSize is a strong choice for Windows users who need detailed storage analysis and, in its paid editions, repeatable reporting, server scans, or consultant-focused licensing. Its on-premise approach and wide scan targets are compelling, but Free is strictly personal and non-commercial, and the desktop lineup does not extend beyond Windows. Choose the edition by workload: Personal for advanced individual use, Professional for in-house IT, and the Consultant or Enterprise option when work spans clients or large networks. Look elsewhere if you need a cross-platform desktop tool or a business-ready free edition.