SECRET EMBEDDER
Hide secret messages inside any PDF. Extract them with a password — or without.
SECRET EMBEDDER
Hide a secret message inside any PDF. Only you can extract it.
Drop carrier PDF
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🔒 The message is embedded as invisible structural data inside the PDF. The file opens and renders normally — no visual difference. Only this tool can extract the hidden payload.
How It Works
Messages are injected as invisible structural data inside the PDF. The file opens and renders identically — no visual difference whatsoever.
Encrypted Mode
Uses AES-256-GCM with PBKDF2 key derivation (100k iterations). Military-grade encryption — without the password, the message is mathematically unrecoverable.
Open Mode
Base64 encoded without encryption. Anyone with this tool can extract the message. Best for non-sensitive dead drops.
Extraction
Switch to the Extract tab and drop a suspect PDF. The scanner will locate hidden payloads and attempt decryption.
Under the Hood
PDF Object Injection
Your secret message is encoded and injected as a custom metadata key inside the PDF's document catalog. It's invisible to all standard readers and viewers.
AES-256-GCM Encryption
When a password is set, the message is encrypted using the Web Crypto API with PBKDF2 key derivation (100k iterations) before embedding. Decryption requires the exact same password.