Password Protect ZIP File
Add AES-256 password encryption to any ZIP archive. Only people with the password can extract the contents.
Complete the security check to begin
Secure your ZIP archives
Add AES-256 encryption to any ZIP file. Recipients will need the password to extract the contents.
- AES-256 encryption - industry-standard security
- Zero storage - your ZIP and password never touch our disk
- Instant processing - encrypted in memory, download immediately
How to Use Password Protect ZIP File Online - Free & Secure
Add AES-256 password protection to any ZIP file. Free, private, no files stored.
Drag and drop your file into the upload area or click to browse your device. Files up to 250 MB are accepted and sent over an encrypted HTTPS connection.
Your file is processed in an isolated, in-memory environment on our servers. It is never written to disk and never mixed with other users' files.
Your result is ready in seconds. Download it, and your file is purged from memory immediately - we keep no copy, backup, or cache.
Why Choose PrivConvert?
Unlike other online tools that upload your files to remote servers, store them for days, and may use them for AI training or data mining, PrivConvert was built with privacy as the foundation.
Files are processed in volatile memory (RAM) and immediately purged. Nothing is ever written to disk or backed up.
All uploads and downloads are encrypted with TLS 1.3. Your files cannot be intercepted in transit.
Use any tool instantly without signing up, providing an email, or creating a profile. No tracking cookies, no user profiling.
Compatible with Windows, macOS, Linux, iOS, and Android. No plugins or desktop software needed - just a modern web browser.
Trusted by Thousands of Users
PrivConvert processes thousands of file conversions every day. Our commitment to privacy and security has made us the go-to choice for professionals, developers, and privacy-conscious users worldwide.
Frequently Asked Questions
Is Password Protect ZIP File Online - Free & Secure free to use?
Yes, completely free with no limits, no sign-up, and no hidden fees. Use it as many times as you want.
Is my data safe?
Your file is processed in an isolated, in-memory environment on our servers, sent over an encrypted HTTPS connection, and permanently deleted the moment your download is ready. It is never written to disk, stored, or shared.
Does it work on mobile devices?
Yes. The tool works on any device with a modern web browser - smartphones, tablets, laptops, and desktops.
Do I need to create an account?
No. You can use the tool instantly without signing up, providing an email, or creating any profile.
AES-256, and the metadata a ZIP cannot hide
This encrypts a ZIP with AES-256, the strong scheme, rather than the legacy ZipCrypto that older tools default to. That distinction is not academic: ZipCrypto dates from the 1990s and is broken by a known-plaintext attack, so an archive encrypted with it can often be opened without the password when any one of its files is guessable. AES-256 has no such weakness.
What stays visible
ZIP encrypts file contents, not the archive's index. Anyone holding the file can list it and see every filename, every directory path, every file size and every timestamp without the password. Only the contents are protected.
That is often more revealing than the contents would be.
redundancy/2026-Q1-selection-list.xlsx tells the story without being
opened. If the names matter, put the sensitive files inside an inner archive with
a neutral name and encrypt that, or rename before archiving.
Compatibility
AES-encrypted ZIPs are handled by 7-Zip, WinRAR, Keka and modern Windows and macOS. Very old tools that only understand ZipCrypto will fail to open them — which is a reasonable trade, since those tools are precisely the ones offering broken encryption.
For an archive where even the filenames must be hidden, 7Z with header encryption is the better format.
Your files and password are handled in memory and never written to disk.