Helphonic

Duplicate File Finder

Find files with exactly identical bytes locally. Review duplicate groups and download one selected copy of each unique file in a ZIP.

Unlimited Free Usage

Compares complete file bytes, including metadata. Similar-looking images may differ. Original files are never deleted. Empty files are supported.

Choose files, then find exact duplicates.

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File contents and entered text stay on this device. Only access checks and non-content usage metadata go to Helphonic.

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Current limits

per operation

Files
20
Per file
20 MB
Total size
24 MB
Comparison
Exact bytes including metadata
ZIP output
26 MB maximum
Copies per group
1 selected file in the ZIP
Empty files
Supported

Limits protect your device memory. Processing speed depends on your device.

Read the security details
Processing limits

Up to 20 files, 20 MB per file and 24 MB combined; empty files supported. ZIP output is capped at 26 MB.
Limit comparison

How to increase limits

Compare the per-operation limits available after registration or with an active paid pass.

Free account

Registered user

Unlimited Free Usage

Files
20
Per file
20 MB
Total size
24 MB
Comparison
Exact bytes including metadata
ZIP output
26 MB maximum
Copies per group
1 selected file in the ZIP
Empty files
Supported
Create a free account
All access passes

Unlimited operations during active validity, subject to abuse safeguards.

Files
20
Per file
20 MB
Total size
24 MB
Comparison
Exact bytes including metadata
ZIP output
26 MB maximum
Copies per group
1 selected file in the ZIP
Empty files
Supported
View packages

The same limits may apply to every tier. Check before purchasing. Device safety limits still apply.

Frequently asked questions

Are my files or results uploaded?

No. Files, file names, camera frames, decoded text and checksums stay in your browser. Only access checks and non-content usage metadata go to Helphonic. Processing libraries are served from this site.

Is this tool free?

Unlimited free usage is available initially to guests, registered users and active paid users. Administrators can change allowances later. Current access information appears on this page; file and device safety limits still apply.

Will this change my original files?

No. This tool produces downloadable results or copies in page memory and never deletes or overwrites your original files. Download before leaving; results are not saved to your account.

What are the processing limits?

Up to 20 files, 20 MB per file and 24 MB combined; empty files supported. ZIP output is capped at 26 MB.

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How to use

Duplicate File Finder

Learn how to use Duplicate File Finder: step-by-step instructions, settings, export options, privacy, limits and troubleshooting.

Step-by-step instructions

  1. Choose two or more files, or one file to check its unique status.
  2. Click Find exact duplicates and review the groups and downloadable report.
  3. Select one representative per group; singleton groups are included as unique files.
  4. Optionally export the selected unique copies as a ZIP. Your original files remain untouched.
Formats and important details

Duplicates mean identical complete file bytes, including metadata. Visually similar photos or matching text inside differently formatted documents are not duplicates unless every byte matches. Names and modification dates are ignored.

Only files with equal sizes need hashing. SHA-256 narrows candidates; a final byte comparison avoids relying on hash equality alone. Empty files form one identical group.

All original files stay in place. The tool offers copies and reports only; it never deletes anything. The ZIP includes one selected file from every group, including files without duplicates. Names are made safe and collisions receive a number.

Scanning and preparing a ZIP are separate successful operations if an administrator enables operation allowances. Changing the file selection clears the previous scan.

Privacy and downloads

All processing happens on this device. Successful results become available after the normal access confirmation. Keep the page open until processing finishes and save your downloads before leaving.

Processing and privacy

Files and entered content are processed on your device in this browser tab. File contents and results are not uploaded to Helphonic or sent to analytics. The page still contacts Helphonic to load its tools, check access and confirm non-content usage information. Work is not saved to your account; download or copy results before leaving or reloading the page.

If an operation cannot finish

Use a current browser and smaller inputs if the tab runs out of memory. Some tools download a local processing library or model on first use, so an internet connection is needed even though your content stays on the device.

If the tool reports that access or limits changed, review the current policy and run it again. If usage confirmation is uncertain after an interrupted connection, a retry can count as another operation. Download completed work before reloading; this site does not keep a recovery copy.

About this tool

Choose files to compare. The tool groups equal sizes, hashes candidate files with SHA-256, then verifies matching candidates byte for byte. Review the report and select a representative from each group for an optional ZIP of unique copies.

Read the full Duplicate File Finder guide (opens in a new tab)