Guide
Private Image Watermark Tool
Add a text or image watermark to a JPG, PNG, or WebP locally, preview the placement, and download only after the result is decoded and verified.
Can I use a logo instead of text?
Yes. Select image-watermark mode and choose a local PNG, JPG, or WebP logo.
Opens the free tool. Your selected files stay in this browser.
Clear answers
Place a visible watermark without uploading the source image or watermark asset.
Add a text or image watermark to a JPG, PNG, or WebP locally, preview the placement, and download only after the result is decoded and verified.
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01
Can I use a logo instead of text?
Yes. Select image-watermark mode and choose a local PNG, JPG, or WebP logo.
Text or image watermark
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02
Does a watermark prove ownership?
No. It is a visible label, not cryptographic proof, and it can potentially be removed or altered.
Live position, opacity, scale, and rotation preview
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03
Are either of the images uploaded?
No. The source and optional watermark asset are decoded and combined in this browser.
Decoded output verification
A local check
Place a visible watermark without uploading the source image or watermark asset.
Add a text or image watermark to a JPG, PNG, or WebP locally, preview the placement, and download only after the result is decoded and verified.
- 01
Selected file
Choose a JPG, PNG, or WebP image.
Choose a JPG, PNG, or WebP image.
- 02
Review before sharing
Live position, opacity, scale, and rotation preview
Configure text or select a watermark image, then adjust placement and appearance.
- 03
Local verification
Review the live preview and create the final copy locally.
Review the live preview and create the final copy locally.
Download the verified result and inspect it before publishing.
Four local steps
Does a watermark prove ownership?
- 01
Text or image watermark
Choose a JPG, PNG, or WebP image.
- 02
Live position, opacity, scale, and rotation preview
Configure text or select a watermark image, then adjust placement and appearance.
- 03
Decoded output verification
Review the live preview and create the final copy locally.
- 04
Text or image watermark
Download the verified result and inspect it before publishing.
Clear answers
Are either of the images uploaded?
No. The source and optional watermark asset are decoded and combined in this browser.
- A visible watermark can still be cropped, covered, or edited by someone else.
- Browser re-encoding removes source metadata and can change compression or color behavior.
- This tool does not add cryptographic ownership or provenance credentials.