File Encryptor & Decryptor (AES-256)
Security ToolsLock any file with a password — AES-256, in your browser
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All history →File Encryptor & Decryptor (AES-256) — at a glance
Protect a private file before you email it, upload it or store it in the cloud.
How to use it — step by step
A file up to 300 MB and a password you can remember.
Add a file
To lock: any file. To unlock: a .enc file made by this tool.
Choose action + password
Use at least 8 characters. Longer phrases are stronger.
Press Run
A strong key is derived from your password, then the file is locked or unlocked.
Download
Save the .enc file, or the restored original file.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What if I forget the password?+
The file cannot be recovered. There is no reset — nobody, including this website, has the key.
How strong is it?+
AES-256-GCM with a key made by PBKDF2-SHA256 (250,000 rounds). Wrong passwords or changed files are detected.
Can other programs open the .enc file?+
No, it uses this tool's own simple format. Decrypt it here (the file name is restored too).
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.