Find duplicate files in your collection using hash-based comparison. Identify exact duplicates instantly.
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Drop files here or click to select multiple files
Select files from the same folder to find duplicates
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Privacy & Security: This tool is for personal use. Your files are not uploaded to any server. All processing happens client-side in your browser.
Disclaimer: Always verify before deleting files. This tool identifies potential duplicates but cannot determine which copy you want to keep.
What the Duplicate File Finder Does and Why It Matters
The Duplicate File Finder compares the files you select by hashing their contents, so it identifies true duplicates even when they have different names. Because it compares the actual bytes rather than just file names or sizes, the matches it reports are reliable.
This matters because duplicate files quietly waste storage and create confusion about which copy is current. Finding them by content — not guessing from names — lets you reclaim space and tidy a folder with confidence that you are not deleting something unique.
How to Use Duplicate File Finder
Select the files you want to check from your device.
Let the tool hash each file's contents in the browser.
Review the groups of files that share an identical hash.
Decide which copies to keep and remove the redundant ones yourself.
Supported Inputs and Limitations
What you provide
A set of files selected from your device
Optionally many files at once for a batch comparison
What you get
Groups of files with identical content (true duplicates)
A clear basis for deciding which copies to delete
Known limitations
It identifies duplicates but does not delete files from your disk for you.
Hashing many or very large files depends on browser memory and can take time.
Files that are visually similar but not byte-identical (for example re-saved images) are treated as different.
Privacy and Security
All comparison happens in your browser by hashing files on your device. Nothing is uploaded to NovaTools or any external server, so even private files can be checked safely.
Frequently Asked Questions
How does it decide two files are duplicates?
It hashes each file's contents and groups files whose hashes match, so duplicates are detected by content rather than by name or size.
Will it delete the duplicates automatically?
No. It reports duplicate groups and leaves the deletion to you, so you stay in control of which copy is kept.
Are my files uploaded?
No. Hashing and comparison run locally; the files never leave your browser.
This free online tool helps you identify duplicate files in your collection. Using hash-based comparison (SHA-256), it can find exact duplicates even if they have different filenames. This helps you clean up storage space and organize your files better.
How to Use
Select files by dropping them onto the upload area or clicking to browse. You can select multiple files at once.
Choose your comparison method: content hash (most accurate), filename, size, or a combination.
Click Scan for Duplicates to analyze your files.
Review the results and identify which files can be safely removed.
Frequently Asked Questions
Is my file data kept private?
Absolutely. All processing happens entirely in your browser. No file data is sent to any server, logged, or stored anywhere. File hashes are computed locally.
How does hash-based comparison work?
The tool computes a SHA-256 hash (digital fingerprint) for each file. Files with identical hashes have identical content, even if they have different names. This is the most reliable way to find true duplicates.
Can the tool delete files automatically?
No, for security reasons, this tool only identifies duplicates. You must manually delete files from your system after reviewing the results.
Is there a file size or quantity limit?
The tool can handle multiple files, but very large files (over 100MB each) or thousands of files may take longer to process due to browser limitations.
Can I compare files across different folders?
Yes, you can select files from multiple locations. The tool will analyze all selected files and find duplicates regardless of their original location.
Recommended next reading
Use these practical guides to understand when this tool is the right choice, what to check before exporting, and which workflow usually comes next.
