Zip Password

The tool reads your ZIP file entirely in the browser and either encrypts or decrypts each entry using ZipCrypto (traditional ZIP encryption):

• Add password — each file inside the ZIP is encrypted with a 12-byte random header and a stream cipher derived from your password. The resulting ZIP can be opened with the built-in ZIP support on Windows, macOS, and Linux, as well as 7-Zip, WinZip, WinRAR, and every other ZIP tool
• Remove password — you provide the current password, each entry is decrypted, and a new unencrypted ZIP is built. If the password is wrong the check byte will not match and you will see an error

Security note: ZipCrypto is the universal standard for ZIP password protection and works everywhere. It is adequate for casual privacy (keeping files from being casually opened). For high-security needs, dedicated encryption tools using AES-256 are recommended; ZipCrypto dates from 1991 and is considered cryptographically weak against determined attackers. That said, it remains the only encryption format every ZIP implementation supports.

No files are uploaded. The entire read, encrypt/decrypt, and rebuild cycle happens in your browser using JavaScript.

You can embed this util on your own site as a widget. Adding ?embed=1 to the URL loads a compact version with just the tool itself; no header, menu, or documentation. Paste this snippet into your HTML:

Copy snippet Adjust the height to taste.