Add a Secret JPG Comment
Hide a text comment inside a JPG's COM segment. Runs entirely in your browser, so your data never leaves your device.
Drop a file here, or click to browse
Files never leave your device
Output
The result appears here as you type.
How to use Add a Secret JPG Comment
- 1. Upload your JPG. Drop the JPEG you want to hide a note in, or a JPEG you suspect already has one, into the input pane.
- 2. Choose Hide a comment or Reveal comments. Pick Hide a comment to write a new note into the file, or Reveal comments to read out any COM segments already embedded in the uploaded photo.
- 3. Type the comment to hide. If hiding, enter your text in Comment to hide, such as meet at noon. The note is written into the JPEG's COM segment, invisible when the image is viewed normally.
- 4. Download or read the result. Download the photo with the comment tucked inside, or read the revealed text directly from the output pane if you chose Reveal comments.
When to use Add a Secret JPG Comment
Add a Secret JPG Comment hides a plain text note inside a JPEG's COM segment, a spot image viewers ignore when displaying the picture. Use it to pass a short message alongside a photo, or to check whether one already carries a hidden note.
- Passing a note alongside a photo. You want to send a photo that also carries a short private note, like a meeting time or a password hint, without adding visible text over the image itself.
- Checking a photo for hidden comments. You received a JPEG from someone and suspect it carries a hidden COM segment, so switching to Reveal comments checks whether any text was tucked inside.
- Simple steganography demonstrations. A class or tutorial on basic steganography uses the JPEG COM segment as an easy, visible example of hiding data in a file that still displays normally.
Examples
Hide a note
Input
photo.jpg + “meet at noon”
Output
photo.jpg with the note tucked into a COM segment
Reveal
Input
photo.jpg (reveal mode)
Output
the hidden comment text
About the Add a Secret JPG Comment tool
Add a Secret JPG Comment does its work locally, right in the browser. Hide a text comment inside a JPG's COM segment. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the JPG Tools collection on EditSafely, a set of 145 small, focused JPG utilities that share the same instant, private workspace.
You can shape the output with 2 settings, including Mode and Comment to hide, and the result refreshes the moment you change one. The finished file is put together in browser memory and saved with the Download button, so it never touches a server on the way to your disk. 2 worked examples further down the page show exactly what the tool produces for real inputs.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Add a Secret JPG Comment free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Are my files uploaded to a server?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
Which files does Add a Secret JPG Comment accept?
It accepts JPG and JPEG photos. There is no file size cap imposed by a server; very large files are limited only by your device's memory.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I save the output?
Click the Download button once the result is ready. The file is built in your browser's memory and handed straight to your downloads folder, without passing through a server.