Compare Files Online
Upload 2 files to instantly check if they are identical using SHA-256 checksums.
Try tool
Find Duplicate Files Online
Upload up to 10 files (10 MB each) 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)
What 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 to Find Duplicate Files Online
You can find duplicate files online in three steps—no software to install:
- Add your files. Drag and drop up to 10 files (10 MB each) into the box above, or click to browse. Any file type works—documents, photos, audio, video, archives.
- Click Find Duplicates. Each file is hashed with SHA-256 in memory. Files with the same hash hold identical content, even when names or dates differ.
- Review the groups. Identical files are grouped together so you can see exactly which copies are redundant and how much space they waste.
Need to scan a whole folder instead of a handful of files? Use the folder compare tool to compare two folders, or the FolderManifest desktop app for unlimited files and full-drive scans.
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.
Find Duplicate Files in Windows 11 (No Extra Software)
Windows 11 has no built-in duplicate finder, but PowerShell can group files by content hash. Open Terminal and run:
Get-ChildItem -Recurse -File | Get-FileHash | Group-Object Hash | Where-Object Count -gt 1
Every group it returns is a set of files sharing an identical SHA-256 hash—your duplicates. It is accurate but read-only (it deletes nothing), and the raw output is awkward to scan.
For a quick check on a few files, the tool above runs the same SHA-256 content match in your browser and shows the duplicate groups visually. For an entire drive with automatic reporting, the FolderManifest desktop app scans unlimited files offline.
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 Email Required
This free browser tool doesn't require an email. For our desktop app trial, we do need an email to send your license key.
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.
Frequently Asked Questions
How to find duplicate files safely?
Use FolderManifest's online duplicate file checker. Upload up to 10 files (10MB each) to check for duplicates. Your files are processed in-memory on our servers and are never stored. After checking, files are immediately discarded.
Does the duplicate file checker store my files?
No. FolderManifest processes files in-memory and never stores them on disk. Your files are analyzed using SHA-256 checksums and then immediately discarded from memory after processing.
What's the difference between online and offline duplicate detection?
Online tools like FolderManifest are perfect for quickly checking up to 10 files for duplicates without installing software. Desktop software is better for scanning entire folders or drives with thousands of files.
Can I find duplicates in multiple folders?
The online tool checks up to 10 individual files. For folder-level duplicate scanning, use the Folder Compare tool or FolderManifest desktop for unlimited file processing.
How accurate is SHA-256 duplicate detection?
SHA-256 is cryptographically collision-resistant, meaning the chance of two different files producing the same hash is virtually zero. It detects duplicates by content, not filename or size, ensuring 100% accuracy.
Why do I have duplicate files?
Common causes include downloading the same file multiple times, backing up to different locations, email attachments, software installers, and photo backups. Duplicate files waste storage and make file organization difficult.
Is it safe to delete duplicate files?
Only if you are certain you do not need multiple copies. Always verify duplicates before deletion—some files may have the same content but serve different purposes (e.g., original vs. backup copies).
How much space can I save by removing duplicates?
It varies widely. Users typically report reclaiming 1-10GB on personal computers, while creative professionals and media collectors often find 50GB+ of duplicate content. Use our tool to calculate your exact wasted space.
Other Free Tools
Compare Folders Online
Upload 2 folders to find missing, modified, or duplicate files with recursive SHA-256 checks.
Try tool
File Metadata Viewer
Extract detailed metadata from your files — sizes, types, dimensions, and checksums.
Try tool
Checksum Calculator
Generate SHA-256, MD5, SHA-1, and CRC32 checksums for any file to verify integrity.
Try tool
Spreadsheet Duplicate Finder
Upload a CSV or Excel file to highlight duplicate values with a per-column count. 100% private.
Try tool