Deduplicate Files with Hashing

Identify duplicate files by comparing their SHA-256 hashes — identical content produces identical hashes.

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Tip: SHA-256 and SHA-512 are cryptographically secure. SHA-1 is legacy and no longer recommended for security-sensitive use. All hashing runs locally in your browser — files and text are never sent anywhere.

Deduplication tips

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Two files with the same SHA-256 hash have identical content, regardless of filename or modification date. Use this to find exact duplicates.

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Hash each version of a document to see if two "different" files are actually the same. Useful for auditing shared drives with redundant copies.

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For large-scale deduplication across thousands of files, use a command-line tool that hashes in bulk. This tool is best for spot-checking.

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Note: perceptual similarity (visually similar images) requires specialised tools. SHA-256 only detects exact byte-for-byte duplicates.

Hoe dit werk

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Enter your data into the tool above. Everything stays local to your browser.

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The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

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Get your result instantly. Nothing is stored after you leave the page — complete privacy.

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