Compare Two Folders Online

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.

Comparison reports differences without changing any files.

Sync modifies files to make folders match, which is riskier when you need an audit trail.

Windows 11 has no built-in screen for comparing the contents of two folders, but you can get a basic answer from the command line—or skip it and use the tool above.

Option 1 — Robocopy (list only, makes no changes): open Terminal or Command Prompt and run a dry run that reports differences without copying anything:

robocopy "C:\FolderA" "C:\FolderB" /L /E /NJH /NJS /FP /NS

The /L flag makes it list-only, so no files are moved or overwritten. You will see which files are new, changed, or missing.

Option 2 — PowerShell hashes: compare folders by content using SHA-256 instead of just name and size:

Get-ChildItem -Recurse C:\FolderA | Get-FileHash

Run it against both folders and diff the two hash lists. This catches files that share a name but differ in content—something a size-only check misses.

Both methods work but are fiddly and return raw text. The folder compare tool above runs the same SHA-256 content check in your browser and shows added, modified, missing, and duplicate files in one view—no install, no commands.

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.