AllDup for Windows

Overview and purpose

AllDup is a no-cost Windows utility from Michael Thummerer Software Design (MTSD) that locates and helps you manage duplicate files. It scans drives and folders to uncover redundant items so you can recover disk space and keep file collections tidy. The program includes built-in viewers for images, text, audio, video and web files so you can inspect matches before taking action.

Search capabilities and filtering

The engine supports a wide variety of comparison methods, allowing precise control over what constitutes a duplicate. You can tailor scans using multiple criteria and refine results with advanced filters.

• Content-based comparisons for exact file matches
• Filename and extension checks for quick grouping
• Size-based screening to eliminate obvious mismatches
• Similarity detection for images and audio files
• Archive scanning for compressed formats like ZIP, RAR and 7Z
• Options to ignore metadata such as Exif, ID3 and FLAC tags

The interface highlights matched groups clearly and includes automated selection rules to speed up cleanup tasks.

Safe handling and housekeeping tools

Once duplicates are identified, AllDup gives you many ways to handle them while reducing the chance of accidental loss.

• Move duplicates to a designated backup folder
• Create hard links or shortcuts instead of deleting originals
• Send unwanted files to the Recycle Bin or remove them permanently
• Rename conflicting files to preserve both copies
• Maintain a detailed log of actions and preview files before changes

These controls let you organize with confidence and recover space without sacrificing important data.

Summary — who it suits

AllDup is a practical, user-friendly option for Windows users who need a reliable tool to eliminate redundant files. With flexible search options, archive support, metadata exclusions and built-in previews, it’s a solid free choice for routine duplicate management and disk cleanup.