HILIA documentation

HILIA is a pair of image-privacy tools from TYO Lab. Steghide conceals any file inside an ordinary-looking PNG, BMP or JPEG and brings it back with a passcode. Watermark embeds an invisible, key-locked ID in an image (or overlays a visible one) so you can prove it's yours later.

Everything runs in your browser at hilia.tyo.com.au/app, signed in with a free TYO ID. Steghide is free; only covert watermark embedding and stamping spend gas.

Popular topics

• Getting started — create a TYO ID, open the tool, hide your first file.
• Hide & reveal — the full steghide workflow, end to end.
• Choosing a hiding method — LSB vs JPEG vs F5, capacity vs stealth.
• Covert watermarking — embed, detect and extract invisible IDs.
• Visible watermark — overlay text or a logo, entirely client-side.
• Accounts & gas — what's free, what costs gas, and membership.
• FAQ — quick answers to the most common questions.
• Troubleshooting — fixes for the usual snags.

For developers

• Developer API — watermark at scale with API keys: embed, extract and detect over HTTPS, with monthly quotas per key.