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Upload 2 files to instantly check if they are identical using SHA-256 checksums. Compare file names, sizes, and modification dates side by side.
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Find Duplicate Files
Upload up to 10 files to instantly identify duplicates using SHA-256 checksums.
Upload Files
Drag and drop files here, or click to select (max 10 files, 10MB each)
Drag & drop files here
or click to browse (up to 10 files)
Need more power?
FolderManifest can scan entire folders, generate detailed reports, and track file changes over time automatically.
View PricingWhat This Tool Can and Can't Do
✅ What it does:
- • Check up to 10 files for duplicates using SHA-256 checksums
- • Groups identical files together regardless of filename
- • Works with any file type (documents, images, videos, etc.)
- • Fast processing with files up to 10MB each
❌ What it doesn't do:
- • Can't process files larger than 10MB
- • Doesn't automatically delete or move duplicate files
- • Won't work for password-protected files
- • Can't scan entire folders at once
When You Need a Full Desktop Solution
Use FolderManifest desktop to scan entire folders for duplicates, generate detailed reports, automatically organize files, and process unlimited file sizes.
How Duplicate Detection Works
FolderManifest uses SHA-256 checksums to identify duplicate files by content, not just filename or size. Here's the process:
- Upload Files: Select up to 10 files from your computer. Our tool accepts any file type and processes files up to 10MB each.
- SHA-256 Calculation: We calculate a unique cryptographic hash for each file. Files with identical content produce identical hashes, regardless of filename or location.
- Duplicate Grouping: Files are grouped by their hash. Any group with 2 or more files represents duplicates that are 100% identical byte-for-byte.
- Results Display: View duplicate groups with filenames and sizes. The tool shows how many duplicate copies exist and calculates wasted storage space.
Why SHA-256 for Duplicate Detection?
Accuracy
SHA-256 is a cryptographic hash that uniquely identifies file content. Even a single bit difference produces a completely different hash, eliminating false positives.
Content-Based Matching
Unlike filename or size comparison, SHA-256 examines actual file bytes. This finds duplicates with different names or dates—common in downloads and backups.
Common Use Cases
1
Clean Up Downloads Folder
Remove duplicate installers, PDFs, and archives accumulated over months. Reclaim gigabytes of storage.
2
Verify Backup Integrity
Check if backup files are identical to originals. Ensure your backup system is preserving data correctly.
3
Organize Photo Libraries
Find duplicate photos across different folders or drives. Keep only the best versions and delete copies.
4
Clean Project Files
Remove duplicate code files, assets, or build artifacts. Streamline your development workflow.
5
Audit Media Collections
Identify duplicate songs, videos, or podcasts. Free up space on your media server or devices.
6
Pre-Upload Check
Before uploading to cloud storage, check for duplicates to avoid wasting storage quota and bandwidth.
Privacy & Security
In-Memory Processing
Files are processed in-memory and never stored on disk.
Immediate Deletion
All files are discarded from memory immediately after analysis.
No Account Required
Start finding duplicates instantly—no signup, no email, no tracking.
HTTPS Encryption
All uploads are encrypted during transmission using TLS 1.3.
Content Hashing Only
We only analyze SHA-256 hashes, not actual file content or metadata.
No Third-Party Sharing
Your data is never sold, rented, or shared with anyone.