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ExactDupe
EXACT DUPLICATE FINDER · LOCAL SHA-256

Same bytes.
Extra copies.

Add one or more folders. ExactDupe first narrows candidates by file size, then hashes the full candidate files locally and groups only byte-for-byte matches. See how much space the extra copies represent before you clean anything up.

Find duplicates
ADD FILES

Compare one folder or several backups

Add folders repeatedly to compare copies stored in different places. Files stay on your device.

Add a folderBest for backups, photo libraries and project archivesFor very large photo libraries. Enumerates the folder gradually instead of loading one giant FileList.
Or add loose filesUseful when you only want to compare a batch

Browser limitation: ExactDupe can only read files you explicitly choose. It cannot silently scan a drive.

No files queued yet. Add at least two files, or use the demo to see the result layout.
HOW IT WORKS

Exact matching without trusting file names

1

Group by size

Files with unique byte sizes cannot be exact duplicates, so they are skipped.

2

Hash candidates

Only same-size candidates receive a full SHA-256 hash, streamed in chunks.

3

Match exact bytes

Same size and same full hash are grouped as exact duplicate copies.

4

Review, then act

Export the report and decide what to keep. Nothing is deleted automatically.

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