Does it compare file names, or actual content?

Content — it hashes each file and compares the hashes, so it catches true duplicates regardless of what they're named.

Will two files with the same name but different content be flagged as duplicates?

No, since their content hashes differ — matching names alone isn't enough to be flagged.

How many files can I check at once?

As many as you select in a batch — the more files you compare, the more thorough the duplicate check.

Does Duplicate File Finder upload my files to a server?

No. Duplicate File Finder runs entirely in your browser using on-device processing, your files never leave your device.

Duplicate File Finder

Find identical files among a batch by comparing their content hash.

Runs in your browser

Drop files to check for duplicates

Choose File

About this tool

Comparing file names or sizes to find duplicates misses the actual test that matters: whether two files have identical content, since two files can share a name but differ in content, or have different names but be byte-for-byte the same. This tool hashes each file's content and flags matches, finding true duplicates in a batch regardless of what they're named, useful for cleaning up a folder of downloads or exports that's accumulated redundant copies over time.

Frequently asked questions

Compare File Hashes

Check whether two files are identical by comparing their hashes.

Zip & Unzip Files

Combine files into a ZIP archive, or extract files from one.

File Size Converter

Convert between bytes, KB, MB, GB, and their binary (KiB/MiB/GiB) equivalents.

File Type Detector

Detect a file's true type from its byte signature, not just its extension.

Batch File Renamer

Rename many files at once using a pattern, and download them as a ZIP.

File Extension Changer

Rename a file's extension without converting its actual format.

Hex Viewer

View the raw bytes of any file as a hex and ASCII dump.

File to Base64 Converter

Encode any file as Base64, or decode Base64 back into a downloadable file.

File Metadata Viewer

View a file's name, size, type and last-modified date.

GZIP Compressor

Compress or decompress a file using GZIP.

File Checksum Verifier

Verify a downloaded file against a published SHA checksum.

Archive Format Converter

Convert between ZIP and uncompressed TAR archives.

PDF Tools

Merge, split, compress and convert PDF files.

Image Tools

Compress, resize, crop and convert images.

Link & QR Tools

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Video Tools

Compress and process video files, right in your browser.

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Data & Spreadsheet Tools

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Business Tools

Invoices, quotations, receipts and other business documents.

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