CLI tools to hide (jdvin) or extract (jdvout) any file type via a JPG image.
You can post your image with hidden data on Mastodon and a few other social media sites.
*Image size limits (cover image + data file):
- Flickr (200MB), ImgPile (100MB), ImgBB (32MB), PostImage (24MB), Reddit (20MB / -r option),
- Mastodon (~6MB / Limit measured by data file size), Twitter (~10KB / Limit measured by data file size).
jdvrif partly derives from the technique discovered by security researcher David Buchanan.
Image credit: @altphotos_pl
Demo Videos: Mastodon (hidden jpg) / X/Twitter (hidden workflow.json) / Web Tool
To post/share file-embedded JPG images on Reddit, you must use the -r option.
Always select the "Images & Video" tab on Reddit to post these images.
When saving images from Reddit, use the new.reddit.com site, click the image in the post to expand it, then save it.
You should see the filename with a .jpeg extension in the address bar of your browser.
To correctly download an image from Twitter, click the image in the post to fully expand it, before saving.
With Twitter, the size limit (~10KB) is 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.
For example, a 30KB workflow.json file compressed down to under 10KB.
Also with Mastodon, the size limit (~6MB) is measured by the data file size and not the combined image size.
For example, if your cover image is 2MB you can still embeded a data file upto ~6MB.
(You can try jdvrif from this site if you don't want to download & compile the source code.)
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 clown.jpg workflow.rar
Saved file-embedded JPG image: jrif_28597.jpg 176345 Bytes.
Complete!
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 4225 Bytes.
Complete! Please check your file.
Issues:
- Reddit - While you can upload JPG images via the mobile app, you need to use the Desktop/browser to download them (new.reddit.com).
- 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