jdvrif

Use CLI tools jdvin & jdvout with a JPG image, to embed or extract any file, up to 2GB (cover image + data file).

Compatible hosting sites, listed below, have their own much smaller image size limits:

• Flickr (200MB), ImgPile (100MB), ImgBB (32MB), PostImage (32MB), Reddit (20MB / -r option),
• Limit measured by data file size: Mastodon (~6MB), Tumblr (~64KB), Twitter (~10KB).

There are many other image hosting sites on the web that may also be compatible.

jdvrif partly derives from the technique demonstrated by security researcher David Buchanan.

Image credit: @DontSmileAI

Your embedded file is compressed (depending on file type) and encrypted.
The data file, if required, is split into multiple 64KB ICC Profile segments within the JPG cover image.

Usage (Linux - jdvin)

user1@linuxbox:~/Downloads/jdvrif-main/src/jdvin$ g++ main.cpp -O2 -lz -s -o jdvin
user1@linuxbox:~/Downloads/jdvrif-main/src/jdvin$ sudo cp jdvin /usr/bin

user1@linuxbox:~/Desktop$ jdvin 

Usage: jdvin [-r] <cover_image> <data_file>  
       jdvin --info

user1@linuxbox:~/Desktop$ jdvin my_cover_image.jpg workflow.json
  
Saved "file-embedded" JPG image: jrif_28597.jpg 146553 Bytes.

Complete!

Usage (Linux - jdvout)

user1@linuxbox:~/Downloads/jdvrif-main/src/jdvout$ g++ main.cpp -O2 -lz -s -o jdvout
user1@linuxbox:~/Downloads/jdvrif-main/src/jdvout$ sudo cp jdvout /usr/bin

user1@linuxbox:~/Desktop$ jdvout

Usage: jdvout <file_embedded_image>
       jdvout --info
        
user1@linuxbox:~/Desktop$ jdvout jrif_28597.jpg

Extracted hidden file: workflow.rar 26364 Bytes.

Complete! Please check your file.

To correctly download images from X/Twitter or Reddit, click the image in the post to fully expand it, before saving.

Twitter.mp4

To share "file-embedded" JPG images on Reddit, you must use the -r option with jdvin.
Select the "Images & Video" tab on Reddit to post your image.

To correctly download an image from Flickr, click the download arrow near the bottom right-hand corner of the page and select Original for the size of image to download.

With X/Twitter & Tumblr, the small size limits (~10KB / ~64KB) are measured by the data file size and not the combined image size. As the data file is compressed when embedded, you should be able to hide files larger than 10KB or 64KB. For example, a 50KB workflow.json file compressed down to 6KB, making it compatible with sharing on X/Twitter.

Also with Mastodon, the size limit is measured by the data file size and not the combined image size.
For example, if your cover image is 1MB you can still embed a data file up to the ~6MB size limit.

You can try jdvrif from this site if you don't want to download and compile the source code.

web2.mp4

Issues:

• ImgPile - You must sign in to an account before sharing your data-embedded JPG image on ImgPile.
  Sharing your image without logging in, your embedded data will not be preserved.

My other programs you may find useful:-

• pdvzip: CLI tool to embed a ZIP file within a tweetable and "executable" PNG-ZIP polyglot image.
• imgprmt: CLI tool to embed an image prompt (e.g. "Midjourney") within a tweetable JPG-HTML polyglot image.
• pdvrdt: CLI tool to encrypt, compress & embed any file type within a PNG image.
• jzp: CLI tool to embed small files (e.g. "workflow.json") within a tweetable JPG-ZIP polyglot image.
• pdvps: PowerShell / C++ CLI tool to encrypt & embed any file type within a tweetable and "executable" PNG image