Password Protect ZIP File

This tool bundles one or more files into a single ZIP locked with AES-256, the encryption mode required to open the archive. It fits the everyday moments where a file leaves your hands but the contents should not be casually readable: emailing a signed contract or scanned ID to a counterparty, handing a vendor a folder of invoices, or attaching HR and payroll documents that should not sit unprotected in an inbox or shared drive.

It also suits sharing where the channel is convenient but not private, such as a chat app, a cloud-storage link, or a USB stick passed between people. Developers can wrap a config bundle or a set of credentials before dropping it somewhere temporary; students and admin staff can lock coursework, records, or transcripts before sending. Because everything happens locally, it works well when the material itself is the reason you would rather not push it through a third-party server.

The pattern that fits best is archiving plus controlled handoff: several files, one recipient, a password you can share over a separate channel. It is less suited to publishing or broad distribution, where a password shared with many people stops being a meaningful boundary.

Drop or select your files into the multi-file area; the tool accepts any file type since it is packaging, not converting. You then set a password and confirm it, with a length-based strength hint (under 8 characters reads weak, 8 to 13 medium, 14 or more strong), name the output (it defaults to protected.zip), and click to create the encrypted archive. The ZIP is built in your browser using AES-256, and the download starts automatically when it is ready.

Nothing is uploaded: the files, the password, and the encryption all stay on your device, and nothing persists after the tab closes. The companion extract tool reverses the process, opening both AES and legacy ZipCrypto archives when you supply the right password.

What it does not do: it will not recover or reset a forgotten password, encrypt an existing ZIP without rebuilding it, or hide file names. Anyone with the archive can see the list of entry names and sizes before unlocking; only the file contents are protected. There is also a practical size ceiling of around 150 MB per batch, since the work runs in browser memory.

The biggest risk is the password itself. There is genuinely no recovery: lose it and the contents are unreadable, so store it somewhere safe and send it to the recipient over a different channel than the file. The strength meter only measures length, not quality, so a long but predictable phrase can still read as strong while being easy to guess.

Compatibility is the second pitfall. AES-256 ZIPs open cleanly in 7-Zip, Keka, and most modern archive tools, but the built-in unzip in older Windows Explorer or macOS Archive Utility may refuse them or only handle weaker ZipCrypto. Tell your recipient which tool to use rather than assuming a double-click will work.

Also remember the scope: encryption protects the packaged copy, not the originals still sitting on your disk, and not the visible file names inside the archive. For the most sensitive material, the in-tool note itself points to dedicated options like VeraCrypt or age, which protect more than a ZIP can.

Before you send anything, verify the archive in three quick steps. Open the downloaded ZIP and confirm it prompts for a password rather than opening freely; enter the password and check that every expected file is present and opens correctly; and glance at the size to confirm it is plausible for what you packed. If it opens without asking for a password, it is not protected, and you should rebuild it.

Test on the recipient's likely setup where you can, ideally with a different archive tool than the one you trust, so a compatibility gap surfaces before it becomes their problem. Re-enter the password yourself from scratch rather than relying on browser autofill, which can mask a typo in what you actually set.

For official, financial, or legal use, treat this as a convenience layer and verify manually. Confirm the unlocked contents against the source documents page by page, keep the password out of the same message as the file, and where a matter is regulated or contractual, have a second person confirm both the contents and that the archive resists opening without the password.