Encrypt Text with AES-256 Without Uploading Anything
BigWow's browser-based Text Encryptor implements AES-256-GCM via SubtleCrypto. Because encryption and decryption run entirely in your browser's sandboxed JavaScript environment, your plaintext, passphrase, and ciphertext are never sent over any network.
AES-256-GCM encryption with a 96-bit random IV generated locally per session.
0 bytes of plaintext, passphrase, or ciphertext transmitted externally.
Compatible with standard AES-GCM outputs — decrypt with any AES-GCM library.
Frequently Asked Questions
How can AES-256 encryption run in a browser?
Modern browsers expose the Web Crypto API (SubtleCrypto), which provides native AES-GCM encryption using your computer's hardware acceleration.
Can the encrypted output be decrypted by other tools?
Yes. BigWow outputs standard AES-256-GCM ciphertext compatible with OpenSSL, Python's cryptography library, and any AES-256-GCM implementation.
Sources & References
- NIST SP 800-38D specification defining AES Galois/Counter Mode (GCM).
- W3C Web Cryptography API specification for SubtleCrypto.encrypt().
Try it now — 100% free, zero upload
No account, no ads, no file size limits. Opens instantly in your browser.