TYO Lab · image privacy tools
Hide Like A Pro
Two precision tools for image privacy: steganography that tucks any file inside an ordinary picture, and watermarking that proves an image is yours — covertly or in plain sight.
01 · Steghide
Hide any file inside an ordinary image
Pick a carrier photo, pick a payload — a PDF, an archive, anything — and HILIA weaves it into the pixels. What comes out looks like the same picture; only someone with the passcode gets the file back.
- Any file, common photos — Works with ordinary PNG, BMP and JPEG photos; the payload can be any file type.
- Four hiding methods — Choose more capacity or a harder-to-detect option for extra stealth.
- Passcode-locked — An optional passcode is required to reveal what's inside.
- Probe & capacity — Check whether an image hides data, and how much a carrier can hold.
02 · Watermark
Mark what's yours — invisibly or visibly
A covert watermark hides your ID inside the image itself — invisible to the eye, recoverable with your key even after the picture has travelled. Prefer to be seen? The visible watermark overlays your text or logo entirely in your browser.
- Covert ID — Embed a short text ID under a secret key, then extract or detect it later with a confidence score.
- Covert logo stamp — Stamp an invisible mark that shows up when the image is run through Reveal.
- Visible overlay — Text or logo at any size, angle and opacity — single mark or classic diagonal repeat, processed entirely client-side.
How it works
Pick an image
Drop in a photo to use as the carrier — or the image you want to protect.
Hide or mark
Hide a file with a passcode, or embed a watermark under your key. Download the result.
Reveal later
The passcode brings the hidden file back; your key recovers the watermark and proves the image is yours.
Dig deeper
Create a TYO ID, open the tool, and hide your first file in two minutes.
The full steghide workflow — methods, passcodes, carriers and pitfalls.
Embed, detect and extract invisible IDs; how keys and strength work.
Watermark at scale with API keys — embed, extract and detect over HTTPS.
Prefer an app? HILIA is on the App Store for iPhone & iPad, the Mac App Store and Google Play — hide & reveal runs entirely on your device. See all downloads.