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ZIP Encryption Strength Checker

Inspect a password-protected ZIP to see whether it uses weak legacy ZipCrypto encryption or modern AES-256, with plain-English recommendations. No passwords are guessed or cracked.

⚡ 199 points per successful run · Balance: 0 · Buy points

Inspect ZIP encryption

Check the archive's declared encryption method. This tool never attempts to guess, crack, or test a password.

  • ZIP input up to 50 MiB
  • Up to 5,000 entries and 100 MiB declared expanded content
  • Metadata inspection only; no entry is decrypted

Upload a ZIP to inspect its declared encryption.

Scope

This tool reads ZIP metadata only. A strong algorithm does not compensate for a short or reused password, and a metadata check is not a cryptographic audit.

About ZIP Encryption Strength Checker

Inspect a password-protected ZIP to see whether it uses weak legacy ZipCrypto encryption or modern AES-256, with plain-English recommendations. No passwords are guessed or cracked.

How to use this tool

  1. Enter the requested data or choose an upload.
  2. Check the file type and size limit before submitting.
  3. Review the result, then download or copy it.
  4. Keep the original and use the actions above to continue safely.

Read the full ZIP Encryption Strength Checker guide →