File Encryption
Encrypt and decrypt any file locally in your browser using authenticated AES-GCM 256-bit browser encryption. Local browser processing with authenticated integrity protection.
Selecting a file allows the browser to read it locally. Files are processed locally in your browser when using supported tools. No upload required for supported workflows.
Drag & drop files to begin
Select or drag multiple files from your device. Entirely processed locally in your browser memory.
Client-Side Local File Encryption
File Encryption provides authenticated symmetric encryption and decryption for files directly in your web browser. Operating entirely within client-side memory using the native Web Crypto API, files are transformed into secure `.enc` encrypted packages without a single byte ever being uploaded to any server or cloud infrastructure.
Utilizing the Advanced Encryption Standard in Galois/Counter Mode (AES-GCM) with 256-bit keys and PBKDF2 key stretching (100,000 iterations), this tool secures any file format. including PDF documents, images, video clips, zip archives, and source code packages.
The encrypted binary envelope preserves the original file name and guarantees cryptographic tamper-proofing. If an encrypted file is corrupted in transit or altered by an unauthorized party, AES-GCM's 128-bit authentication tag will fail verification and prevent compromised data extraction.
Core Tool Capabilities
- In-browser Local Processing: Encrypts and decrypts files in device RAM using browser ArrayBuffer and Web Crypto APIs with zero network data transfer.
- cryptographic standard AES-256-GCM: Industry-standard authenticated cipher ensuring confidentiality and tamper-evident message integrity.
- PBKDF2 Key Stretching (100,000 Rounds): Hardens user passphrases against brute-force and dictionary attacks using SHA-256 and unique 16-byte random salts.
- Authenticated Binary Envelope: Preserves the original file name inside an authenticated binary package for integrated restoration upon decryption.
- Universal File Compatibility: Encrypt any file type (PDFs, spreadsheets, photos, compressed archives, and executables) up to browser memory capacity.
Local Browser Privacy
Your files are processed locally on your device. Files are not uploaded, transmitted, or stored on remote servers.
Once the page has loaded, you can disconnect your network connection and continue using this tool offline.
Target Use Cases
- • Cloud Storage Pre-Encryption
- • Secure Email & Messaging Attachments
- • Offline Data Backup Protection
Technical Specifications & Platform Limits
Authenticated symmetric encryption with 128-bit tag.
NIST-compliant password hardening with random 16-byte salt.
Processed entirely in client ArrayBuffer streams.
Strict offline-first local execution.
Native browser hardware-accelerated SubtleCrypto.
Step-by-Step Workflow
Select Local File
Drag and drop any file into the workspace or click to browse your local file system.
Choose Mode & Enter Passphrase
Select 'Encrypt File' or 'Decrypt .enc File' and enter your secret passphrase.
Process File Locally
Click 'Encrypt File' or 'Decrypt File' to perform local in-memory cryptographic operations.
Download Result
Click 'Download Encrypted File' to save the .enc package or 'Download Restored File' to retrieve your original asset.
Practical Real-World Use Cases
Cloud Storage Pre-Encryption
Encrypting confidential tax records, contracts, and medical scans locally before uploading to public cloud services like Google Drive or Dropbox.
Secure Email & Messaging Attachments
Sending sensitive spreadsheets or archives across email or Slack as an encrypted .enc file with the passphrase communicated out-of-band.
Offline Data Backup Protection
Protecting database exports and sensitive source code archives stored on external USB drives against theft or loss.
Frequently Asked Questions
- Are my files uploaded to your servers?
- No. Your files never leave your computer or mobile device. All encryption and decryption operations take place directly in your browser's local memory using the Web Crypto API.
- What file types can I encrypt?
- You can encrypt any file format, including PDFs, images (PNG, JPEG), Office documents (Word, Excel), audio/video files, and ZIP archives.
- What happens if I forget my passphrase?
- Because the tool uses true zero-knowledge client-side encryption with AES-GCM 256-bit keys, there is no master key, backdoor, or recovery mechanism. If you lose your passphrase, the file cannot be decrypted.
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Master this tool with Guides & Articles
Learn the workflows, common mistakes, and advanced techniques behind File Encryption with our deep-dive educational content.