DiskGeek scans your drives and shows exactly what's eating your space, with a sortable list view and a treemap view. It finds exact duplicates (SHA-256) and near-duplicate / visually similar images using perceptual hashing, with full-text search across scan results and batch rename. Snapshot comparison shows what changed between scans over time, and scheduled, unattended scans can run from the command line for ongoing monitoring. Includes NTFS permission auditing plus CSV/HTML export.

No installer bloat, no bundled offers, no telemetry, no Pro tier or upsells — 100% free.

Requires Windows 10 or 11 (64-bit). Self-contained installer bundles .NET 8, ~32 MB download.

Features

  • Scans on a background thread - the window never freezes
  • Sortable list view plus a squarified treemap of the whole drive
  • Exact duplicate detection - size, then quick hash, then full SHA-256
  • Similar image detection by perceptual hash, with adjustable sensitivity
  • Instant in-memory search across everything the scan found
  • Batch rename - find and replace, prefix, suffix, auto-numbering
  • Snapshots - compare a scan against a later one to see what grew
  • NTFS permission auditing, with inherited rights shown separately
  • Scheduled, unattended scans from the command line
  • Runs entirely offline - no uploads, no account, no telemetry

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Additional Project Details

Operating Systems

Windows

Intended Audience

End Users/Desktop

Programming Language

C#

Related Categories

C# Disk Space Analyzers

Registered

2026-08-08