Yes. Encryption happens entirely inside your browser. Your files are never uploaded, transmitted, or stored on Zelf's servers.
Encrypt Files Online
Protect any file in seconds using AES-256 encryption. Your files never leave your browser.
♙ Nothing is uploaded. Nothing is stored.You have full control of your data.
Local Encryption
→→▣
▣••••••••••••→End-to-End Encryption
Encrypt Your Files Before Uploading Them To The Cloud
Millions of people trust services like Google Drive, iCloud, Dropbox, OneDrive, Amazon S3, and Backblaze to store their files.
These services protect your account—but they aren't designed to ensure that only you can read your files.
Encrypt your file locally before uploading it to any cloud storage provider. Your files remain encrypted wherever they are stored, and only someone with the correct password can decrypt them.
→When to Encrypt
Why Encrypt Your Files?
Not every file should be readable by everyone.
Whether you're sharing a contract with a client, sending tax documents to your accountant, backing up crypto wallets, or storing personal records in the cloud, encryption ensures that only someone with the correct password can access your information.
Without encryption, anyone who gains access to your file can read its contents.
With encryption, the file becomes unreadable until it's unlocked with the correct password.
Encrypt files before you
DocumentsShare contracts or legal documents
FinancialSend financial statements
RecordsStore tax records in the cloud
WalletsBack up cryptocurrency wallets
IdentityArchive passports or identity documents
MedicalTransfer medical records
CollaborationIntegrate Transfer medical records
Encryption protects the file. A strong password protects the encryption.
→Encryption process
How File Encryption Works
Encrypting a file transforms the data into an unreadable format that only someone with the correct password can restore.
Using the tool above is simple:
→Password Security
Your Encryption Is Only As Strong As Your Password
AES-256 encryption is trusted by governments, enterprises, and security professionals around the world.
But even the strongest encryption depends on one thing:
The password protecting it.
Weak passwords can be guessed.
Reused passwords can be stolen.
Shared passwords can be leaked.
A strong, unique password dramatically increases the security of every encrypted file.
→Meet ZelfKeys
Generate Strong Passwords. Store Them Securely. Access Them Whenever You Need Them.
ZelfKeys is a self-custody password manager designed to protect the passwords that protect everything else—including your encrypted files.
Protect More Than Your Files
Store The Passwords That Unlock Them.
→File encryption FAQ
Everything You Need to Know About File Encryption
Learn how local AES-256 encryption protects files before they reach cloud storage.