About StegoToolkit

StegoToolkit is a free, browser-based platform of steganography, encryption, and developer tools. Every tool — from hiding a message inside an image to running a full forensic steganalysis scan — runs entirely client-side in JavaScript. Nothing you upload is ever sent to a server, because the platform doesn't have one for file processing.

Most existing steganography tools are either decades-old desktop utilities (Java applets, abandoned CLI programs) or paid/limited web services that upload your files to a third party. StegoToolkit was built to give CTF players, security researchers, students, and hobbyists a fast, free, privacy-respecting alternative that works directly in the browser — no installs, no accounts, no file uploads.

• CTF players

  Quick, reliable tools for extracting hidden flags from images, audio, PDFs, and more — including a full brute-force/forensics mode for harder challenges.

• Security researchers & students

  Reference implementations of real steganography algorithms (LSB, DCT/F5, PVD, palette-based methods, and more) with explanations of how each one works.

• Developers & hobbyists

  General-purpose encoding/decoding tools that don't require signing up or installing anything.

Every tool on this site processes data locally in your browser — images, audio, video, and documents are decoded, analyzed, and re-encoded using WebAssembly and native browser APIs, with heavy computation offloaded to Web Workers so the interface never freezes. The full architecture and every tool's methodology are documented publicly as part of the codebase.

Questions, bug reports, or feature requests are always welcome — use the Contact page and a message goes straight to the team.