Private browser file tool
Watermark Image
Add a visible text watermark to a photo or image.
Add a visible text watermark to a photo or image.
How it works
- Choose JPG, PNG or static WebP files from your device.
- Process them locally in your browser.
- Download One watermarked PNG image.
Limits and support
- JPG, PNG and static WebP only; maximum 24 megapixels and 8192 pixels per side.
- Images are re-encoded; source metadata and color profiles are not preserved.
- Text is rendered using fonts installed on your device.
- This adds a visible mark and does not prevent copying or prove ownership.
Selected file data is processed on your device and is not uploaded to CobaltPebble for processing.
Watermark Image FAQ
- What files does it accept?
- JPG, PNG or static WebP; up to 1 file at a time.
- What does it create?
- One watermarked PNG image
- What should I do if processing fails?
- Choose a smaller supported image, check the preview and adjust the options before retrying.