Checksum-based document deduplication: prevent duplicates

Duplicate documents are not just messy.

They create audit risk:

• teams approve the wrong version
• payments get supported by the wrong attachment
• evidence becomes ambiguous (“which one is correct?”)

Start here:

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The simplest reliable dedupe signal: checksums

Filenames are not reliable.

Two different files can share a name, and the same file can be uploaded with a different name.

A checksum (like SHA-256) lets you detect duplicates deterministically.

What to do when you detect duplicates

Do not delete immediately.

Instead:

1. Confirm whether the duplicate is identical (checksum match)
2. Decide whether to keep one canonical record (and tag it)
3. Maintain version history if the “duplicate” is actually a revision

Next steps

If your evidence library is drifting, fix structure first:

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• document tags + naming convention (UAE)