Samsung
Turn Custom Watermark On or Off auf Samsung
The custom watermark option lives inside the Samsung camera app, not in the general system settings. It works independently of One UI, so you find it directly in the camera rather than under device settings.
Enabling it adds a short text plus a small camera icon to the lower left corner of every photo you take afterward. The feature does not apply to videos, screenshots, or images already saved in your gallery.
To turn the watermark on or off, follow this path: Tap on Camera ➤ Tap on Settings ➤ Tap on Watermark ➤ Enable or disable Watermark ➤ If desired, set a Custom watermark.
The text field lets you enter your own wording, but the position stays fixed in the lower left corner and the camera icon next to it cannot be removed. If you need full control over placement, size, or design, editing the photo afterward with a separate app is usually the better option.
Turning the watermark off again removes it from new photos, but any image already saved with the stamp keeps it permanently unless you edit or crop that file separately.