Large File Encrypt & Decrypt

Chunked AES-GCM with PBKDF2 (browser-only). Not compatible with GPG. Designed to handle very large files.

Settings

Password

PBKDF2 Iterations

Higher is slower but more secure.

Chunk Size

Larger chunks can be faster but increase memory usage.

Decrypt Preview

Show decrypted text preview

For privacy, preview is off by default. Only the first portion is shown when enabled.

Preview limit (bytes)

Default 1,048,576 bytes (1 MiB). The full file still downloads regardless.

Encrypt

File to encrypt

Or paste text (small/medium only):

Text to encrypt

Decrypt

Encrypted file (.wcaes)

File format: Magic "WCSA", version 1, algo AES-GCM, 16-byte salt, PBKDF2-HMAC-SHA-256, per-chunk IV 12 bytes, ciphertext+tag per chunk, and the original filename stored in the header.