AllDup

AllDup is a Windows utility for finding and managing duplicate files, including similar images and media. It suits people who want to compare files across local, network, or archived storage and inspect matches before cleanup. Its range of matching and review tools makes it a capable free option, but its hard-link function is confined to files on one local NTFS partition.

Overview

AllDup looks beyond exact copies: it can compare content, file properties, names, image and sound similarity, and duration for video or sound files. That breadth is useful for untidy collections where duplicates have been renamed or edited, though users should review matches before removing anything. Previews and exports help make that review practical.

Key features

• Flexible matching: Search by content, image or sound similarity, filename, file size, and similar media duration. This can uncover more than identical copies, making it useful for large photo and music collections as well as ordinary file cleanup.
• Broad scan coverage: Scan NTFS, FAT, FAT32, and exFAT storage through drive letters or network paths, plus ZIP, RAR, and 7Z archives. That reach suits collections divided among drives, shares, and compressed archives.
• Review and cleanup: Preview images, text, sound, and video, then delete, move, or back up matches. Automatic selection and Recycle Bin support can streamline cleanup, while previews let users check files before acting.
• Results you can keep: Export search results to a text file or Excel table, useful for documenting a scan or reviewing findings outside the program.
• Two ways to run it: Choose an installable version or a Portable Edition, which gives users a choice about how they deploy the utility.
• Hard-link caveat: Hard links can save space in the right workflow, but AllDup requires the files to be on the same local NTFS partition. They cannot be created on network drives or in virtual folders that refer to external data.

Pricing

AllDup Freeware — free. The plan is free for private users and companies, with Windows-only coverage. There is no trial to weigh against a paid tier: AllDup is offered as free software, and the stated plan has no seat or scan quota. For anyone seeking duplicate cleanup without a subscription or commercial-use restriction, that is a straightforward fit.

Platforms

AllDup runs on Windows 11, 10, 8, and 7, as well as Windows Server 2008 R2 through 2025, in 32-bit and 64-bit versions. The download page lists version 4.5.72, dated 17.12.2025, in installable and portable editions. The interface is offered in 25 languages. The maker says downloads are digitally signed and free of adware, spyware, and viruses, and provides SHA1 checksums. Online documentation, a support forum, and a technical-support request form round out the support options.

Who it's for

AllDup is a good fit for Windows users who need to search more than one drive, include network shares or archives, and want to inspect results before changing files. It is also suited to both personal and company use under its free plan. It is a less suitable choice for people who need a cross-platform tool or want hard links across network storage or external-data virtual folders.

Pros and cons

• Pro: Matching covers content, properties, names, image and sound similarity, and media duration, giving users more ways to find near-duplicates.
• Pro: Scanning includes common file systems, network paths, and ZIP, RAR, and 7Z archives, so searches need not stop at local folders.
• Pro: Previews, exports, backups, and Recycle Bin support offer useful safeguards and review options before or after cleanup.
• Pro: The free plan covers private users and companies, and the program has both installable and portable editions.
• Con: It is Windows-only, so users who need one tool across macOS or Linux should look elsewhere.
• Con: Hard-link creation is limited to one local NTFS partition, ruling out network-drive and external-data virtual-folder workflows.

Alternatives

Duplicate File Finders is a useful place to compare more options. Consider Czkawka if you need a free, ad-free option that also runs on Android, Linux, and macOS. dupeGuru is another free choice for Linux and macOS users as well as Windows users.

Duplicate Cleaner may suit personal or home users who want a free basic Windows edition, or users willing to consider a Pro plan; its free edition is not for commercial use. CloneSpy is a free Windows duplicate-cleanup alternative. Choose fclones if you prefer a free MIT-licensed command-line utility available for Linux, macOS, and Windows.

Cisdem Duplicate Finder is a paid alternative with one-year subscriptions for one Windows PC or one Mac, each priced at $19.99 a year. Duplicate File Detective is another paid Windows option. Anti-Twin is a free alternative for Windows, Linux, and macOS.

Verdict

Choose AllDup if you use Windows and want a free duplicate finder with broad matching, archive and network scanning, and review tools before cleanup. Its best case is a varied collection where exact-name or exact-content searches are not enough. Look elsewhere if you need cross-platform support or depend on hard links beyond a single local NTFS partition.