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Duplicate File Finder

Find byte-identical files among a selection, regardless of filename, and export a CSV report.

Tool inputs stay in your browser · optional AI search sends your query

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Good to know: Select up to 500 files, 100 MiB per file. Size checks, SHA-256 hashes, then byte-by-byte comparison distinguish exact copies. Similar-looking photos with different bytes are not matches. No files are deleted, renamed, or uploaded. Hashing reads one candidate file into memory at a time. CSV lists selected files only, not your whole computer.

How to use it (step by step)

  1. 1Choose the files you want to compare. Nothing outside this selection is scanned.
  2. 2Press Find duplicates. Use Cancel if you want to stop. Matching names alone do not count.
  3. 3Review each duplicate group and download the CSV report. Delete unwanted originals yourself only after checking them.

Words to know

Exact duplicate
Two files containing the same bytes, even if their names differ.
SHA-256
A fingerprint used to narrow candidates; this tool also compares matching file bytes.

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