Encrypt a file online Online Free
AES-256-GCM encryption and decryption runs entirely in your browser using the Web Crypto API. Your files and keys never leave your device.
Encrypt/Decrypt Tool
Encrypt or decrypt text and files using various encryption algorithms. All processing happens in your browser - your data never leaves your device.
Input
Click to select a file or drag and drop here
Configuration
Output
Supported Algorithms
AES: Advanced Encryption Standard - Recommended for most use cases. Supports 128, 192, and 256-bit keys.
TripleDES: Triple Data Encryption Standard - More secure than DES but slower than AES.
Blowfish: Block cipher with variable key length (32-448 bits). Fast and secure.
Twofish: Block cipher, finalist in AES competition. Very secure with 128-bit blocks.
Serpent: Block cipher, AES finalist. Considered very secure.
Rabbit: Stream cipher, fast and efficient for large data.
RC4: Stream cipher - Legacy, not recommended for security-sensitive applications.
DES: Data Encryption Standard - Legacy algorithm, not recommended for new applications.
Note: Some algorithms (Blowfish, Twofish, Serpent) may require additional CryptoJS modules. If unavailable, use AES or TripleDES.
AES, TripleDES, Blowfish, Twofish, Serpent, Rabbit, RC4, and more. Choose the right cipher for your use case.
All encryption uses the Web Crypto API in your browser. No data is ever sent to any server.
Encrypt plain text or entire files. Output in Base64 or Hexadecimal. Download encrypted files directly.
Understanding Client-Side Encryption
The Encrypt/Decrypt tool runs entirely in your browser. When you encrypt text or a file, your browser generates a random encryption key, applies AES-256-GCM encryption, and outputs the ciphertext. The key never leaves your device unless you explicitly share it. This means even if someone intercepts the encrypted output, they cannot decrypt it without the key.
This tool is useful for encrypting sensitive data before storing it in cloud drives, emailing confidential documents, or creating encrypted backups. You can encrypt text directly or upload files of any size supported by your browser's memory.
Encrypt a file online Online Free
This page is FileShot's dedicated Encrypt a file online landing. Use the tool above — same privacy model as our other free browser tools.
Why convert with FileShot
No account required for core use, clear format detection, and optional encrypted sharing after you finish. Pair with Compressor or Video Downloader when you need a full media workflow.
FAQ
Is Encrypt a file online free?
Yes. FileShot includes this tool in the free daily quota. Pro unlocks higher limits and larger files.
How does Encrypt a file online work?
Open this page, upload your file, choose options, and download the result. No desktop install required.
Are my files kept on FileShot servers?
Image and many audio jobs stay in-browser. Some document/video jobs use temporary server processing and files are deleted after the job.
Can I convert multiple files?
Yes when the parent tool supports batch mode — select up to the UI limit and download individually or as a ZIP.
Frequently asked questions
Is Encrypt a file online free?
Yes. FileShot includes this tool in the free daily quota. Pro unlocks higher limits and larger files.
How does Encrypt a file online work?
Open this page, upload your file, choose options, and download the result. No desktop install required.
Are my files kept on FileShot servers?
Image and many audio jobs stay in-browser. Some document/video jobs use temporary server processing and files are deleted after the job.
Can I convert multiple files?
Yes when the parent tool supports batch mode — select up to the UI limit and download individually or as a ZIP.