What is Tuxia?

Tuxia is an image steganography tool that hides any file (images, videos, documents, archives…) inside an ordinary picture. When sharing, you just send the picture — to everyone else it's a perfectly normal cover image; only someone who opens it in Tuxia and enters the password (if any) can pull out the hidden files.

How it works

PNG image data officially ends at the IEND marker (GIF: 0x3B). Viewers stop reading there and ignore any bytes after it. Tuxia appends your file data (optionally AES-256-GCM encrypted) into that "no man's land", plus a small metadata block (file names, sizes, salt, etc.).

This also explains the single most important rule: once an image is compressed or transcoded, the trailing data is wiped — so you must share the original. Curious for more? See Steganography 101.

Use cases

• Sharing files on forums and communities that accept original images but make attachments awkward;
• Sharing sensitive files in a work group chat — add a password and even a leaked screenshot stays safe;
• Hiding important documents inside a landscape photo as an "invisible" backup on your cloud drive;
• Watermarking images before distributing them, marking source and intended use.

Four steps

Notes

• Keep it under ~50MB per session — bigger files mean bigger images and slower processing;
• If you set a password, remember it — lose it and the files are truly unrecoverable (we don't have it either);
• The recipient needs no account — just open Tuxia and upload the image to extract.

Try it →