Duplicate File Finder Free Online Tool 2026

Last updated March 22, 2026

Duplicate File Finder Examples

The Duplicate File Finder identifies files with identical content using cryptographic hashing. Below are examples of what the finder detects and how results are presented.

Duplicate Photo Detection

Uploaded files: 150 photos from a camera import

Scan complete: 150 files analyzed
Duplicates found: 3 groups (8 duplicate files)
Potential space savings: 24.6 MB

Group 1 — 3 identical files (8.2 MB each):
  ✓ KEEP  /Photos/2024/vacation/IMG_4521.jpg  (newest, Mar 15 2024)
  ✗ DUPE  /Photos/backup/IMG_4521.jpg         (Mar 10 2024)
  ✗ DUPE  /Downloads/IMG_4521.jpg             (Feb 28 2024)

Group 2 — 2 identical files (6.1 MB each):
  ✓ KEEP  /Photos/2024/vacation/IMG_4522.jpg  (newest)
  ✗ DUPE  /Photos/backup/IMG_4522.jpg

Group 3 — 3 identical files (4.1 MB each):
  ✓ KEEP  /Documents/logo.png                 (newest)
  ✗ DUPE  /Downloads/logo.png
  ✗ DUPE  /Desktop/logo-copy.png

Document Folder Scan

Scan complete: 320 files analyzed
Duplicates found: 5 groups

Group 1 — report.pdf (2.4 MB):
  /Documents/reports/Q4-2024-report.pdf
  /Desktop/Q4-2024-report.pdf
  /Downloads/Q4-2024-report.pdf

Group 2 — contract.docx (180 KB):
  /Documents/contracts/service-agreement.docx
  /Documents/archive/service-agreement.docx

Group 3 — config.json (4 KB):
  /projects/app-v1/config.json
  /projects/app-v2/config.json   ← same content, different directories

Hash-Based Comparison

Two files with different names but identical content:

File A: logo-final.png        (SHA-256: a3f8c2d1...)
File B: logo-final-copy.png   (SHA-256: a3f8c2d1...)

Result: DUPLICATE — byte-for-byte identical content
Size:   45,312 bytes each
Action: Mark "logo-final-copy.png" for deletion

Two files with the same name but different content:

File A: config.json  in /project-v1/  (SHA-256: b7e4a1c2...)
File B: config.json  in /project-v2/  (SHA-256: d9f2b3e4...)

Result: NOT DUPLICATE — different content despite same filename

Code Repository Scan

Scan: /src directory (1,240 files)

Duplicates found: 4 groups

Group 1 — utils.js (identical in 3 locations):
  /src/components/utils.js
  /src/helpers/utils.js
  /src/lib/utils.js
  Recommendation: Consolidate into a single shared module

Group 2 — logo.svg (identical in 2 locations):
  /src/assets/logo.svg
  /public/images/logo.svg
  Recommendation: Keep /public/images/logo.svg, update imports

Group 3 — .eslintrc.json (identical in 2 locations):
  /src/.eslintrc.json
  /src/components/.eslintrc.json
  Recommendation: Remove the nested copy, use root config

Scan Statistics

Files scanned:        1,240
Unique files:         1,228
Duplicate groups:     4
Duplicate files:      12
Space wasted:         8.4 MB
Space recoverable:    6.2 MB (keeping one copy per group)

Hashing algorithm:    SHA-256
Scan duration:        2.3 seconds
Pre-filter by size:   Eliminated 890 files before hashing

Handling Options

• Mark for deletion — flag duplicates for manual review before removing
• Move to folder — relocate duplicates to a /duplicates/ folder for review
• Generate report — export a CSV or text report of all duplicate groups
• Auto-keep newest — automatically mark the most recently modified copy as the keeper
• Auto-keep by path — keep copies in a specified preferred directory

Common Use Cases

• Cleaning up photo libraries after multiple imports from the same camera
• Removing duplicate downloads from the Downloads folder
• Finding accidental file copies in document folders
• Identifying duplicate assets in code repositories
• Auditing backup folders for redundant copies
• Reclaiming storage space on full drives

Upload files or specify a directory to scan. The finder groups identical files by hash, shows file paths and sizes, and provides safe options for handling duplicates without risking accidental data loss.