Compare Files Online
Upload 2 files to instantly check if they are identical using SHA-256 checksums.
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Compare Folders Online — Free Folder Diff Tool
Use this directory compare tool on Windows, macOS, or Linux to find missing, modified, identical, or duplicate files. Upload 2 folders with up to 100 files and 50 MB per folder.
How to Compare Two Folders
Step 1: Select Your Folders
Upload Folders
Select 2 folders to compare (max 100 files, 50MB each).
Folder A
Folder B
Step 2: Choose Comparison Options
Click "Compare Folders" to scan both folders and generate the comparison summary.
Step 3: Review Results
Review the summary counts, differences, and duplicates after the scan completes.
Folder Comparison Essentials
Folder comparison versus synchronization
Comparison reports differences without changing files. Synchronization copies, updates, or deletes files to make two folders match.
Comparing directories
A directory is a folder. Select two directory roots and this tool recursively compares relative paths and SHA-256 file contents.
Comparing folder contents on Windows
Use the browser tool for a clear folder diff, or use Robocopy with /L for a list-only command-line check.
When to use the desktop app
Use FolderManifest for unlimited files, saved HTML reports, repeat comparisons, saved history, and local offline operation.
How Folder Comparison Works
Folder comparison at FolderManifest uses SHA-256 checksums to analyze every file in both folders. This cryptographic hash uniquely identifies file contents, ensuring accurate comparison regardless of filenames or modification dates.
The process begins with recursive scanning—our tool traverses all subfolders within each folder you upload, building a complete file inventory. Each file is analyzed to generate its SHA-256 hash, which serves as a digital fingerprint.
After scanning completes, the tool cross-references the two file inventories:
- Only in A: Files found exclusively in Folder A
- Only in B: Files found exclusively in Folder B
- Identical: Files with matching SHA-256 hashes (same content)
- Different: Files with same path but different hashes
Additionally, the tool detects duplicate files within each folder and across both folders, helping you identify wasted storage space and clean up redundant copies.
Why Compare Folders?
Backup Verification
Confirm your backup matches the source before you rely on it.
Migration Validation
Ensure every file moved correctly after a server or cloud migration.
Sync Safety
Preview differences before running a sync to avoid overwrites.
Duplicate Cleanup
Identify duplicate content across folders to reclaim storage.
Folder Comparison Features
Recursive Scanning
Every subfolder is included so you get a full inventory.
SHA-256 Verification
Hashes verify content matches, not just filenames.
Duplicate Detection
Spot duplicates within and across folders automatically.
Privacy & Security Guarantee
Folder comparison uses secure upload with server-side, in-memory processing and immediate cleanup - no storage, no tracking, no retention.
- No permanent storage: Files are held in memory only during comparison and deleted immediately upon completion.
- No email required: Start comparing folders instantly - this browser tool doesn't need an email. For our desktop app trial, we do need an email to send your license key.
- HTTPS encryption: All uploads are encrypted in transit using TLS 1.3, protecting your data during transmission.
- No file access by humans: Our automated system processes files without human intervention—no one views your data.
- Immediate deletion: Memory is cleared the moment comparison finishes, leaving no residual traces.
- No third-party sharing: We never sell, rent, or share your data with anyone—you're our only customer.
Common Use Cases
Backup Verification
Compare backup folders against originals to ensure every file is present and identical. Catch corrupted or incomplete backups before disaster strikes.
Data Migration
After migrating data to a new server or cloud provider, compare source and destination folders to confirm successful transfer with zero data loss.
Folder Sync Validation
Before running automated sync tools, manually compare folders to preview what changes will occur. Avoid accidental deletions or overwrites.
Duplicate Cleanup
Identify duplicate files scattered across folders. Free up storage space by removing redundant copies while preserving originals.
Version Control
Compare different versions of project folders to see which files changed between releases. Track modifications without complex version control systems.
Audit Preparation
Document folder contents before and after audits. Generate evidence of file integrity for compliance, legal, or regulatory requirements.
When to Use Online vs Desktop Comparison
Use the online tool for quick folder checks. Choose the desktop app for large folders, automation, and reporting.
What This Tool Can and Can't Do
What it does:
- Compare up to 2 folders (100 files, 50MB each)
- Find files only in Folder A or Folder B
- Detect identical files using SHA-256 checksums
- Find files with the same name but different content
- Detect duplicates within each folder and across both folders
- Works with any file type
- Recursive subfolder scanning
What it doesn't do:
- Can't process folders larger than 50MB
- Doesn't automatically delete or move files
- Won't sync folders or apply changes
- Can't compare more than 2 folders at once
- Doesn't provide historical tracking or change reports
When You Need a Full Desktop Solution
Use FolderManifest desktop to scan unlimited folders, generate detailed audit reports, schedule automatic comparisons, and track changes over time.
Frequently Asked Questions
How do I compare two folders online?
Upload both folders using the folder selection buttons. The tool will scan all files recursively, calculate SHA-256 checksums, and show you which files are unique to each folder, which are identical, and which have the same name but different content.
How can I compare folder contents for differences?
Upload two folders and review the generated differences report. You will see files unique to each folder, matching files, and files with the same name but different content.
Can I compare folders without syncing?
Yes. Folder comparison reports differences only and does not modify your files. This is safer when you want to review changes before any sync action.
How long does it take to compare large folders?
Most comparisons complete within seconds. The time depends on file count and sizes, not folder structure complexity. SHA-256 calculation is optimized for speed while maintaining accuracy.
Can I export comparison results?
The free online tool displays results but does not support export. FolderManifest desktop can generate interactive HTML reports for documentation and audit purposes.
What file types are supported in folder comparison?
All file types are supported. The tool compares files by content using SHA-256 checksums, regardless of file extension. This works for documents, images, videos, archives, and any other file type.
What happens if folders have different structures?
The tool handles different folder structures gracefully. It compares files by path relative to each folder root, so you can see which files exist in one folder but not the other, regardless of subfolder organization.
Is online folder comparison private and secure?
Yes, when using FolderManifest. Your files are processed in-memory on our servers and never stored. After comparison, files are immediately discarded from memory.
Can I compare directories online?
Yes. A directory and a folder are the same thing—upload two directories and the tool compares every file inside them by SHA-256, showing which files are added, missing, or changed between the two.
Is this a folder diff tool?
Yes. This tool works as a folder diff checker: it diffs two folders and reports every added, missing, and modified file. Unlike a text diff, it compares file contents by SHA-256 checksum, so it works for binary files (images, videos, archives) as well as text.
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