Can it crack a password I forgot?

No. This tool re-encrypts archives you can already open; it does no password recovery of any kind. A wrong current password simply fails.

The recipient cannot open my encrypted zip — why?

Almost always AES-256: neither Windows Explorer nor macOS Finder can read AES-encrypted zips. Choose ZipCrypto if it has to open with the built-in tools, but note it is cryptographically weak — for anything sensitive, keep AES-256 and have the recipient install 7-Zip or Keka.

Does repacking change the contents?

No. Every file is read out of the original archive and written back unchanged; contents, folder structure and timestamps are preserved. Only the compression and encryption are regenerated from your settings.

Why do the filenames look right afterwards?

If the original stored names in a local code page such as GBK, they are decoded with the encoding you pick and written back as UTF-8, so the new zip shows correct names on Windows, macOS and Linux alike.

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🔐Add or Remove a ZIP Password Online

Add a password to a zip you already have, or remove one when you know the password — no need to unzip and rezip by hand. Choose AES-256 for real security or ZipCrypto for compatibility with the built-in unzip on Windows and macOS. The password stays in your browser.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use ZIP Password

1Drop in a .zip file
2Choose "Add password" or "Remove password"; enter the current password if the archive is encrypted
3Click Start and download the new zip

FAQ

Can it crack a password I forgot?: No. This tool re-encrypts archives you can already open; it does no password recovery of any kind. A wrong current password simply fails.
The recipient cannot open my encrypted zip — why?: Almost always AES-256: neither Windows Explorer nor macOS Finder can read AES-encrypted zips. Choose ZipCrypto if it has to open with the built-in tools, but note it is cryptographically weak — for anything sensitive, keep AES-256 and have the recipient install 7-Zip or Keka.
Does repacking change the contents?: No. Every file is read out of the original archive and written back unchanged; contents, folder structure and timestamps are preserved. Only the compression and encryption are regenerated from your settings.
Why do the filenames look right afterwards?: If the original stored names in a local code page such as GBK, they are decoded with the encoding you pick and written back as UTF-8, so the new zip shows correct names on Windows, macOS and Linux alike.