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Unlock ZIP with password
Remove AES or legacy ZipCrypto protection with the known password and download an unencrypted ZIP.
ZIP
ZIP
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
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How to use this tool
- Choose one encrypted ZIP up to 20 MiB.
- Enter the password. Creation requires at least 12 characters.
- Process and download the ZIP. Keep the password separately; Reset clears working inputs.
Examples
Open a ZIP with a known password and download an unencrypted ZIP containing the exact original file bytes.
Limitations
- Creation: 100 files, 16 MiB each, 20 MiB total and 24 MiB output. Unlocking: 20 MiB input, 1,000 entries, 16 MiB per file and 64 MiB expanded/output. Processing uses a cancellable local worker with a 120-second deadline.
- Creation uses standard WinZip AES-256 AE-2 with authenticated contents. Filenames and sizes remain visible, and a strong unique password is important. Some built-in archive readers do not support AES ZIP.
- Unlocking accepts WinZip AES and legacy ZipCrypto stored/DEFLATE entries. ZIP64, split/self-extracting archives, symbolic links, special files and unsafe or conflicting paths are rejected. Nested archives are not recursively expanded.
- Passwords are supplied by you, never guessed or recovered. A wrong password, corrupt content or failed size/authentication check yields no partial output. Passwords are masked and excluded from generated files and reports.
- Unlock output is unencrypted. Original timestamps and empty directory entries are omitted; supported regular-file names and contents are retained. Legacy ZipCrypto provides weak protection.
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