Stego-Lab App Icon

Stego-Lab

Steganography · EXIF · Watermarking · Decoding · Batch

Hide messages inside images, strip GPS metadata and protect your work — all locally on iPhone, iPad and Mac. No cloud backend, no tracking.

↓ Get it on the App Store 🌐 Try the Web Demo 📘 Manual v1.1 (PDF)
Download on the App Store iPhone · iPad · macOS Encode · Decode · EXIF · Batch Free + Pro Unlock
0 external requests · on-device · Open Source (MIT)

What Stego-Lab does

An end-to-end, privacy-focused image workflow — encrypting, decoding, metadata and watermarking in one app.

🔒

Encode

Hide text, images or files inside a carrier image — content AES-encrypted with your password.

🔓

Decode

Recover hidden content from encoded images — text, image and file.

🗺️

EXIF & GPS

Read, edit and re-save EXIF, TIFF and GPS metadata locally. Strip GPS on demand.

💧

Watermarking

Visible and invisible watermarks in one tool — for creators and archives.

🗂️

Batch

Repeatable visible, invisible or combined watermarks across many images.

📊

Info & Capacity

Format, image size and stego capacity at a glance — see how much text, image or file fits into a carrier.

🛡️

On-device

All image processing stays local on the device — no upload, no cloud backend.

📖

Open Source

MIT-licensed and open source — Stego-Lab's security is verifiable by anyone.

🌟

Direct capture (Pro)

Shoot a photo with the camera and hide it inside the carrier in one step — RAM-only, no detour through the photo library. macOS supports Continuity Camera (iPhone as external cam). A live quality slider balances resolution against the carrier's capacity.

Why Stego-Lab?

Stego-Lab app icon with eye logo — version 1.0, available for iOS, iPadOS and macOS
Everything in one app — instead of 5 separate tools
Five reasons for Stego-Lab: steganography, watermarking, EXIF control and batch processing — all local on one device
100% private — offline, no cloud, no tracking
Original versus image with hidden payload — no visible difference, AES-256-CBC encrypted
Original vs. Stego — no visible difference, content AES-encrypted

Free & Pro

Start fully free — Pro unlocks the advanced workflows.

Free

  • Visible watermarks
  • Simple text decode
  • Basic EXIF read & edit
  • Import from Photos and Files
  • Visible export workflows

Pro

  • Invisible steganography
  • Image and file decode
  • Password-protected payload workflows
  • Batch workflows
  • Full EXIF editor including GPS

Positioning

Stego-Lab is a native app for iPhone, iPad and Mac that combines four specialised tool areas: steganography, watermarking, EXIF/metadata editing and batch image processing. All data is processed strictly on device — no cloud, no external servers.

Why it feels different

FocusWhat Stego-Lab offers
On-deviceimage handling stays local on the device
Technical controlstego-safe export logic, metadata editor, batch workflows
Creator utilityvisible and invisible watermarking in one tool
Clear workflowsEncode, Decode, EXIF, Batch and Info stay cleanly separated

Export logic

WorkflowRecommended exportWhy
Invisible payloadsPNG, TIFFlossless formats keep embedded content reliable
Visible-only outputPNG, TIFF, JPGJPG is fine if no hidden payload must survive
ImportJPG, PNG, TIFF, HEIC, many RAW variantsdepends on iOS and ImageIO support

What steganography can — and cannot — do

Stego-Lab encrypts the content of a hidden payload (AES with your password). It does not make the payload statistically invisible — the existence of a stego channel can be detectable with standard analysis (e.g. RS analysis, chi-squared tests). In short: the content is protected, the presence of a stego channel may be statistically detectable. See Security Notes for scope, tested classes and known limits.

Security & License

The 2026-04-10 repository audit covers the full macOS + iOS + shared engine codebase and found 0 critical, 0 high, 1 medium and 6 low findings after the PV2 crypto migration.

Stego-Lab is released under the MIT License (SPDX: MIT). Full text and a German note on the License page; the binding copy lives in the repository root. Copyright (c) 2026 Christian Raith.

More for press and media: Press Kit · Privacy Policy · Downloads.

Creator & Support

Christian Raith — Wiener Neustadt, Austria

⚠ Report security issues privately to stego-lab@proton.me — not in a public GitLab issue. See SECURITY.md and /.well-known/security.txt (RFC 9116).

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Scan a code to open the website — or download Stego-Lab straight from the App Store.

QR-Code: www.craith.cloud/stego-lab
www.craith.cloud/stego-lab
QR-Code: Stego-Lab on the App Store
apps.apple.com/app/stego-lab