Add visible watermarks and invisible SIGNA signals, then review useful image information before you save, share, or publish.

SIGNA combines practical watermark tools, invisible SIGNA signals, and easy-to-read image information in one app. Watermarking, SIGNA signal inspection, and image analysis are handled directly on your device.

Create visible watermarks

Add custom text or logo watermarks to your images. Adjust the font, color, size, opacity, and position to match your style.

When you apply a visible watermark, SIGNA also adds an invisible SIGNA signal automatically.

Process up to 10 images at a time, and adjust the watermark position for individual images when needed.

Save your favorite watermark designs as presets and quickly reuse them later.

Add invisible SIGNA signals

You can also add an invisible SIGNA signal without placing a visible watermark on the image.

Choose Original or SNS depending on how you plan to save or share the image.

Up to 10 images can be processed at a time.

Inspect SIGNA signals

Open an image and inspect whether a SIGNA signal can be found.

For the clearest result, use the original-quality file saved by SIGNA whenever possible.

Review image details

Review clear, easy-to-read information about your image, including:

• Image resolution, dimensions, and file size
• Compression and file condition
• Available metadata
• Indicators that may relate to editing or other changes

SIGNA helps you review useful image information without requiring technical knowledge.

Save and export image reports

Review image information in one place and save or export a report for your own reference.

Keep your work organized

Save watermark presets for later use and manage related local records directly on your device.

Your images stay on your device

Watermarking, SIGNA signal inspection, and image analysis take place on your device.

SIGNA does not upload your images to its own servers for watermarking or image analysis.

SIGNA is designed for creators, photographers, designers, online sellers, small businesses, and anyone who wants a straightforward way to prepare and review images before sharing them.

Please note

Social media platforms and messaging apps may resize, compress, crop, or otherwise change images. These changes can make an invisible SIGNA signal harder to find.

SIGNA provides practical reference information. It does not prove ownership, originality, copyright status, legal status, or whether an image was created by AI.