Find and remove duplicate files by comparing size, content, name, or hash. Recover disk
space by
deleting unnecessary duplicates. All processing happens locally in your browser.
🔍 Drop files/folders here to scan for duplicates
or
For folder scanning, use Chrome/Edge. For other browsers,
select
multiple files.
100% (Exact Match)
No duplicates found yet
Add files and click "Scan for Duplicates" to begin
Selected for Removal
No files selected for removal
📁 Total Files
0
🔄 Duplicate Files
0
💾 Space Wasted
0 B
🎯 Potential Savings
0 B
Duplicate Distribution by Type
File Type
Total Files
Duplicates
Space Wasted
% Duplicate
No data available
📊 Scan Summary
Scan not performed yet
File Comparison
Select duplicate group to compare files
Image Preview (if available)
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📥 Download Clean Files
💡 Duplicate Finding Tips
Start with quick scan: Use file size and name comparison first for speed
Verify before deleting: Always preview files before marking for deletion
Keep originals: When in doubt, keep the file with the original/earliest
date
Check file contents: Files with same size but different names might still
be
duplicates
Backup important files: Always keep backups before deleting duplicates
About Duplicate File Finder
Duplicate File Finder helps you identify and remove duplicate files from your computer, freeing up
valuable
disk space. It uses multiple comparison methods including file size, name, content hash, and
byte-by-byte
comparison to ensure accurate detection. All processing happens locally in your browser for privacy
and
security.
How It Works
File Collection: Select files or folders to scan for duplicates
Initial Filtering: Files are grouped by size (different sizes cannot be
duplicates)
Content Comparison: Files with same size are compared using hash algorithms or
direct
byte comparison
Duplicate Grouping: Identical files are grouped together for review
Selection & Removal: Choose which duplicates to keep and which to remove
Cleanup: Download cleaned files or generate deletion report
Comparison Methods
⚡ Quick Scan
Compares file sizes and names. Fastest method but may miss some duplicates if
files
have
different names.
🔍 Content Scan
Reads file contents and compares byte patterns. More accurate but slower for
large
files.
🔐 Hash Comparison
Computes cryptographic hashes (MD5, SHA-1, SHA-256) for each file. Very
accurate
and
efficient for comparison.
🎯 Advanced Scan
Combines multiple methods with configurable thresholds. Can find similar but
not
identical
files.
Common Sources of Duplicate Files
Multiple Downloads: Downloading the same file multiple times to different
locations
Backup Copies: Creating backups that include already existing files
Sync Conflicts: Cloud storage or sync services creating multiple versions
Software Installations: Applications copying the same files to multiple
directories
Photo Imports: Importing photos from cameras or phones multiple times
Email Attachments: Saving the same attachment from multiple emails
Safety Features
Preview Before Delete: View file contents before marking for deletion
Auto-Selection Rules: Smart rules to automatically select which duplicates to
keep
Undo Support: Multiple levels of undo for safe experimentation
Session Saving: Save scan results to resume later
Export Reports: Generate detailed reports of found duplicates
No Permanent Deletion: Files are only removed from the list, not from your
computer
Technical Details
Duplicate File Finder uses the HTML5 File API to read files locally in your browser. For hash
computation,
it uses the Web Crypto API where available, with fallbacks to JavaScript implementations. The tool
can
handle thousands of files, though performance depends on file sizes and your computer's
specifications.
For very large files (>100MB), consider using the quick scan option or limiting the scan to specific
folders.