How to Hide and Extract Data with OpenStego

OpenStego's data hiding mode does one job in two directions: embed a file inside a cover image, or pull that file back out of the image. Both operations run from the same tool, and the official site describes the workflow as "pretty straightforward" — you pick a cover image, point the tool at the data you want to hide, and later reverse the process using the resulting image. The steps below follow the two modes the site documents (Hide data and Extract data).

Before you start

• A cover file — the site's example is an image, which is the typical carrier for this kind of hiding.
• The data file you want to hide — any file you want to embed.
• OpenStego installed — the site's Download page is the place to get it; the homepage itself doesn't host the installer.
• The stego image from the hide step — you need this exact output file to extract anything later. If you lose it, the hidden data is gone with it.

Hiding data inside an image

1. Open OpenStego and choose the data hiding mode of operation.
2. Select your cover image — the picture that will carry the hidden file.
3. Select the data file you want to hide.
4. Run the hide operation. The tool produces a new image that looks like the original but contains your file.
5. Keep that output image. It is the only thing you need to hand to someone else (or store yourself) for extraction.

The site illustrates this with a "Hide data" screenshot, so the exact field layout matches what you'll see in the app.

Extracting data from an image

1. Switch to the extract side of data hiding mode.
2. Select the stego image — the output you created in the hide step, not the original cover.
3. Run the extract operation.
4. Open the recovered file. It should match the file you originally hid.

The site shows this as the "Extract data" screenshot.

What to watch for

• Use the output image, not the original. Extraction works against the image that already contains the data. Pointing the tool at the untouched cover image gives you nothing.
• Data hiding and watermarking are separate modes. Watermarking is a beta feature for embedding an invisible signature and later verifying it — it is not how you hide and retrieve a file. If your goal is "get this file back out later," stay in data hiding mode.
• The homepage is a starting point, not full documentation. It links to a Concepts page for background and shows screenshots for each operation; the Download page is where you get the software.

Quick reference

If you only need one direction — say, embedding a file to send to someone — you can stop after the hide step. Extraction only matters when you or a recipient need the file back.