Underlayer
Underlayer — Steganography Made Simple
Hide secret messages in images. Extract hidden text. Two encoding modes: invisible pixels and messenger-proof colored frame.
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Why Underlayer
Simple steganography for hiding secret messages in ordinary pictures
Two Encoding Modes
Hidden mode — invisible pixels for direct sharing. Open mode — colored frame border, survives Telegram and WhatsApp compression
Privacy First
All processing happens locally on your device. No internet required. No data collection or tracking whatsoever
Message Extraction
Automatic detection of encoding method. Works with images from messengers. Share an image from the gallery straight into the app
Download Underlayer
Transform ordinary images into secret carriers. Two encoding modes. Local processing. No account required.
Android
Google Play
iOS
App Store
Questions & Answers
Everything you need to know about Underlayer
Steganography is the practice of hiding secret messages inside ordinary data. Underlayer uses the LSB method to hide text messages in image pixels, invisible to the naked eye. The app offers two encoding modes: Hidden (invisible) and Open (a visible colored frame).
Hidden mode embeds the message invisibly in the image pixels; it is best when the image is sent without compression, as a file. Open mode encodes the message as a colored frame around the image; it survives Telegram and WhatsApp compression and is recommended for messengers.
Underlayer supports JPG, PNG, GIF and WebP images for both hiding and extracting messages.
Underlayer is available for Android (Google Play) and iOS (App Store). There is also a free web tool that works in any browser and uses the same format.
Use the Share button in your gallery, camera or messenger and pick Underlayer. The app opens the image and lets you either hide a message in it or read the hidden message from it.
Yes. All processing happens locally on your device: no internet connection is needed, your messages never leave the phone, and there is no data collection or tracking. Note that hiding is not encrypting: anyone who opens the image in Underlayer can read the message.
Yes. Underlayer is free with full steganography functionality. The free version shows banner ads and occasional interstitials; a Premium subscription removes all ads.
No banner ads, no interstitial ads between actions, and an uninterrupted workflow for as many images as you like. All steganography features are the same in the free version.