Sound Mark
Turn text into secret sound waves
Light Shadow
Embed hidden text in images
Hidden Mark, Private Heart.
Turn ordinary text into invisible sound waves, hidden images, and secret QR codes — all on your device, completely private.
Turn text into secret sound waves
Embed hidden text in images
Transform text into invisible carriers — only recognizable by HiddenMark, completely undetectable to others.
Turn text into inaudible sound waves that are only decodable by HiddenMark. Save and share via AirDrop or any messaging app — the hidden message stays invisible to everyone else.
Embed text invisibly into images with zero visual changes. The picture looks completely normal but contains your secret message. Perfect for private notes and hidden data storage.
Generate nearly invisible QR codes that are scannable only by HiddenMark. Create fun secret codes for friends or share private content that's completely hidden from view.
We believe true privacy means zero data collection. HiddenMark runs 100% locally.
No cloud, no server, no data leakage. All computations happen entirely on your device.
Camera and photo access is requested only when you actively use related functions. Nothing more.
No login required, no tracking, no personal information gathered. We don't even have a server.
Whether you're sharing whispers with your partner or storing confidential information — HiddenMark is for you.
It's a creative way to connect emotionally and keep what matters private.
Sound, image, and QR — three powerful tools in one simple app. No need for multiple apps.
No cloud risks, no server breaches. Your data lives only on your device, period.
Turn ordinary text into exclusive, private memories that only the intended recipient can access.
Unlock all features with a budget-friendly plan. Try free first, upgrade when ready.
Download HiddenMark now and turn ordinary text into exclusive, private memories.