Software · Photo & graphics

Ermis

Hide content in images or audio.

Completely free
Linux
Open source

Overview

Features described in its Flathub listing and in its GitHub repository: data encryption.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“ENCR marker for automatic encrypted data detection” — Flathub, 10 November 2026

At a glance

All of Ermis is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-3.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
Commercial use allowed

About

Ermis is a cross-platform steganography application that allows you to hide and extract secret data within digital media files. Named after the Greek god of messages and communication, Ermis enables covert communication through innocent-looking image and audio files. Image Steganography: Hide data in PNG, JPG, and BMP images using LSB (Least Significant Bit) techniques Live preview of original and modified images with side-by-side comparison PRT Artistic Mode: Specialized visual steganography for camera-scannable codes Real-time capacity indicator showing available hiding space Audio Steganography: Support for WAV, MP3, FLAC, and OGG audio files Automatic conversion of non-WAV files using FFmpeg Built-in audio player with play/pause/stop and volume controls Metadata extraction for accurate capacity calculation Data Handling: Text input for hiding plain messages with UTF-8 encoding File input for hiding any file type with filename preservation Smart marker system (0x00 for text, length byte for files) Automatic detection of data type during extraction Security Features: Optional AES encryption with passphrase protection ENCR marker for automatic encrypted data detection Passphrase memory during current session Secure extraction with decryption prompts User Interface: Dual-tab interface for hiding and extracting data Drag and drop support for both images and audio files Clipboard integration for one-click text copying Image preview highlighting with file path display Camera integration for scanning PRT artistic codes

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 10 November 2026
Last technical check: 8 November 2026
Description from Flathub — AppStream (Flathub)

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