Free Invisible Image Watermark Tool
Hide a message inside any image that survives compression, cropping, screenshots, and social media re-encoding. Use it to prove ownership or trace leaks. Free, no signup needed.
How invisible watermarking works
Upload your image
JPEG, PNG, or WebP. The original stays untouched.
Enter a hidden message
A name, license ID, or code, up to 32 characters.
Download
The watermarked image looks identical to the original.
Detect later
Upload a suspected leak to recover the hidden message.
When to use invisible watermarks
Honeypot traps
Give each recipient a unique watermark. If content leaks, the hidden message identifies who leaked it.
Proof of ownership
Embed your name or copyright notice before publishing. Recover it anytime to prove the image is yours.
Leak tracing
Found a suspicious image online? Run it through the detector to check if it contains your watermark.
Pre-distribution protection
Watermark images before sending to clients, agencies, or subscribers. Works alongside visible watermarks or C2PA.
Neural vs. classic watermark robustness
Our neural watermark uses deep learning to survive transforms that break older methods.
Invisible watermark FAQ
- What is an invisible watermark?
- It's a hidden signal embedded directly into the pixel data of an image. You can't see it, but a detector can recover it to prove ownership or identify who received a specific copy. Unlike a logo overlay, it doesn't change how the image looks.
- How is this different from a visible watermark?
- A visible watermark (logo or text overlay) deters casual copying but is easily cropped or painted over. An invisible watermark survives compression, cropping, rotation, screenshots, and social media re-encoding without degrading image quality.
- What transforms does the watermark survive?
- Our neural watermark survives JPEG compression, resizing, cropping, rotation, screenshots, and social media re-encoding (Instagram, Twitter, etc.). Classic frequency-based methods (DWT/DCT) fail against most of these.
- Can someone remove the invisible watermark?
- The watermark is spread across the entire image at the sub-pixel level. Removing it without destroying the image is extremely hard. Even heavy compression or format conversion usually preserves enough signal for detection.
- How do honeypot traps work?
- Give each recipient a different hidden message (their name or a code). If a leaked version shows up, run it through the detector. The recovered message tells you exactly which copy was leaked and who had it.
- How long can the hidden message be?
- Up to 32 characters. That's enough for a name, license ID, date code, or short identifier. Shorter messages are more robust against heavy edits.
- Is my image stored on your servers?
- No. Images are processed in memory and discarded right after the response is sent. We don't store, log, or keep your images.
- What file formats are supported?
- JPEG, PNG, and WebP. The output comes back in the same format as the input.
- Is this tool really free?
- Yes. This demo version has a daily limit per IP address. For unlimited use, batch processing (up to 50 images), and API access, see our subscription plans.
This is a free demo with daily usage limits. Powered by our partner ForensicMark, a neural watermarking API for invisible image watermarking and C2PA content credentials. Images are processed in memory and not stored. For unlimited watermarking, batch processing, and automated leak enforcement, see our subscription plans. By using this tool you agree to our Terms of Service.