Free Online Watermark Adder
Updated September 2026
Add a text watermark to photos. Customize position, font size, and opacity — free online watermark tool, no upload to external servers.
Verified Capabilities
Place the watermark at any of 5 fixed positions: the four corners or dead center.
Control the watermark text size and transparency to balance visibility with protection.
Watermarking happens entirely in your browser via the Canvas API — no upload, no server round-trip.
Text watermarks only — there's no logo/image overlay option, no tiled/repeating pattern, and the text color is fixed (white fill, black outline) with no customization.
Professional image processing once required expensive desktop software. The Watermark Adder handles the same job in seconds — entirely in your browser, with no file uploads to external servers.
Add a text watermark to photos. Customize position, font size, and opacity — free online watermark tool, no upload to external servers. Results are immediate — no waiting, no loading screens, no account required.
Who uses the Watermark Adder?
- Photographers protecting online portfolio images from unauthorized use or theft.
- Stock image creators adding preview watermarks before client approval and payment.
- Business owners protecting product photos from being reused without attribution.
Common uses and search terms
The Watermark Adder is frequently used for: watermark, add watermark, text watermark. Whether you need a quick result or are working through a longer project, the tool handles all common variations without any configuration.
Why use Allio Tools's Watermark Adder?
Your files never leave your device — all processing is done locally using browser JavaScript APIs. The tool is completely free with no usage limits, no premium tiers, and no account required. Available in 11 languages and optimised for all screen sizes, the Watermark Adder works on desktop, tablet, and mobile with no app download needed.
See also:JPG to PNG Converter · QR Code Generator · PNG to JPG Converter
How the Watermark Adder works
Upload the image you want to watermark using the file selector.
Enter your watermark text in the Watermark text field.
Choose a position (Bottom Right, Bottom Left, Top Right, Top Left, or Center), then adjust font size and opacity.
Click Apply Watermark and download the protected image.
Tips & tricks
- This tool only supports text watermarks — there's no way to upload a logo image and overlay it instead.
- There's no "tiled" or repeating-pattern position — only five fixed placements (the four corners and center).
- Watermark text color is fixed as white with a black outline and can't be customized — this is designed for visibility on both light and dark image backgrounds, not for color matching.
- Applying the watermark requires clicking "Add Watermark" — changing the text, position, size, or opacity afterward requires clicking it again to re-render.
Frequently Asked Questions
What opacity should I use for a watermark?
Standard watermarks use 30–50% opacity — visible enough to protect the image but not so opaque that it obscures the content. For portfolio previews you want to devalue, 70–80% opacity is common.
What is the best position for a watermark?
Center watermarks are hardest to crop out but most obtrusive. Corner watermarks (bottom-right is standard) are less obtrusive but easier to crop. This tool offers Bottom Right, Bottom Left, Top Right, Top Left, and Center — there's no tiled/repeating-pattern option across the whole image.
Can I remove a watermark from an image?
This tool only adds watermarks — it has no removal feature. Removing watermarks from copyright-protected images you don't own is generally illegal under copyright law (DMCA in the US).
Does this tool support image watermarks (logo overlay)?
No — this tool only adds text watermarks. There's no option to upload a separate logo image and overlay it; the watermark is always text you type into the Watermark text field.
Can I change the color of the watermark text?
No — the watermark text is always rendered in white fill with a black outline (for visibility on both light and dark backgrounds). There's no color picker or customization for the text color itself.
Is my image processed on your servers?
No. Watermarking runs entirely in your browser using the HTML5 Canvas API. Your original images and watermarked outputs are never uploaded to any server.
Is my data safe when using the Watermark Adder?
Completely safe. The Watermark Adder processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
What image formats does the Watermark Adder support?
The Watermark Adder works with common image formats supported by your browser, including JPEG, PNG, WebP, and GIF. SVG support varies by tool. No format conversion plugin or driver is needed.
Does the Watermark Adder work with large image files?
Yes. The Watermark Adder processes files entirely in your browser using the Canvas API. Very large files (over 20 MB) may take a few extra seconds on older or lower-powered devices. Closing other tabs can free up memory for better performance.
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