Underlayer: Hide Text in Photo

Mister Mef

Contains adsIn-app purchases

About this app

UNDERLAYER: STEGANOGRAPHY MADE SIMPLE

Turn ordinary pictures into secret carriers. Underlayer hides a text message inside a photo and reads hidden messages back. Everything happens on your phone.

📸 HIDE A MESSAGE
• Hide any text in a photo from your gallery
• Two modes: Hidden (invisible pixels) and Open (colored frame)
• Open mode survives Telegram and WhatsApp compression
• Share the result right away or save it to the gallery

🔍 READ A MESSAGE
• Extract hidden text from an image in one tap
• The app detects the mode automatically
• Share an image to Underlayer from the gallery or a messenger

🔐 PASSWORD PROTECTION
• Lock a message with a password: it is encrypted with AES-256 before it goes into the picture
• Without the password nobody can read it, not even in Underlayer
• Opening a password-protected message is free for everyone

💡 TWO MODES
HIDDEN MODE
• The message is stored invisibly in the pixels
• The picture looks exactly the same
• Send it as a file: messengers recompress photos and erase the message
OPEN MODE
• The message is drawn as a colored frame around the picture
• Survives sending as a regular photo in Telegram and WhatsApp
• Best for messengers

🔒 PRIVATE BY DESIGN
• Processing happens on your device, no internet needed
• Your images and messages are never uploaded
• No account, no sign-up
• Without a password, anyone who opens the picture in Underlayer can read the message. Add a password for confidential text

🎯 IDEAS
• A note or a riddle inside a photo for a friend
• A quiet watermark with your name inside your own pictures
• A game, a scavenger hunt, or a fun way to learn steganography

🌐 ALSO IN THE BROWSER
The free web tool at underlayer.mef.space uses the same format: hide a message on a computer and read it on your phone, or the other way round. Password-protected messages are opened in the app.

🌍 37 LANGUAGES
The app follows your device language; you can change it in Settings.

⭐ PREMIUM
Free with all steganography features, with ads. Password protection comes with the Premium subscription, which also removes all ads, or unlock it for 24 hours by watching 3 short videos. A one-time purchase removes ads for good.

JPG, PNG, GIF and WebP supported.

What’s new

• Password protection: lock a message with a password (AES-256). Opening it is free
• Try it right away: a sample picture with a hidden message on the home screen
• Shared pictures can carry a caption that tells the recipient how to open them (you can turn it off)
• Long messages in Hidden mode are no longer cut off
• Premium: a subscription with passwords and no ads, or a one-time purchase that removes ads
• Cleaner look with new icons