Watermark Image: what this tool does
Apply a text or logo watermark to one image or a batch with position, rotation, size, opacity and tiling controls. The source is decoded and processed in the current browser tab; CalculatorGeek does not receive the image bytes.
This page owns the watermark image online task. For the adjacent workflow, use Photo Editor, or return to the Image Tools Hub to choose another operation.
For the next related calculation, use the Blur an Image Area. Drag over a private detail or enter exact coordinates, then blur, pixelate or cover the selected area with a solid color.
How to use Watermark Image
- Choose a supported source image or enter the page-specific source content.
- Set the visible controls for this task.
- Inspect the processed preview, dimensions, format and measured byte size.
- Run the final action and download the result. Keep the original until you have checked the output.
To compare this result with another relevant method, open the Compress Image. Compress one image or a batch with format, quality, maximum-dimension and optional file-size-goal controls, then compare actual bytes.
Method and result meaning
Each source is drawn to canvas, then the chosen text or locally decoded watermark image is composited once or tiled using the selected alpha, scale, rotation and placement.
The result panel is the authoritative state for this session: it reports the rendered dimensions, encoded format and actual output bytes. The source file is never overwritten.
Which settings should you choose?
Choose settings from the destination requirement, not from a promise of universal quality.
- Use a transparent PNG logo for a reusable brand mark or choose text for a quick visible label.
- Use a corner position for lower visual impact and Tiled when discouraging reuse matters more.
- Check the smallest and largest image in a batch because one percentage-based size is applied to every file.
Worked example
On a 1600-pixel-wide image, a 6% text size starts at 96 pixels. Bottom-right placement keeps a proportional margin based on the text size.
After completing this task, Meme Generator handles the next distinct image operation without mixing its settings into this page.
Privacy, supported files and limitations
A watermark can communicate ownership but cannot prevent screenshots, cropping or removal. This tool does not establish copyright ownership.
Processing is local to the browser. Each input is limited to 25 MB and 80 megapixels, each output to 64 megapixels, and batch-capable tools accept up to 20 files. Animated inputs use the decoded still frame.
Inputs, outputs and result meaning
Each source is drawn to canvas, then the chosen text or locally decoded watermark image is composited once or tiled using the selected alpha, scale, rotation and placement.
Inputs
- Source width
- Decoded source width in pixels. Supported units are px.
- Source height
- Decoded source height in pixels. Supported units are px.
Outputs
- Decoded source pixels
- This is the primary result. It is displayed in px. The display rule uses up to 0 decimal places.
The documented method is applied after the inputs are validated and normalized. Keep the result label, unit, selected mode, and stated limitations together when sharing the answer.
Frequently asked questions
Can I tile the watermark?
Yes. Choose Tiled to repeat text or a logo across each image.
Does watermarking prove ownership?
No. It creates a visible mark but is not legal registration or proof by itself.
Sources and method transparency
The implementation and its stated limits were reviewed on October 14, 2026 against the following browser-platform documentation.
- MDN - CanvasRenderingContext2D.drawImage() - Documents the browser drawing, scaling and source-rectangle operation used by the image pipeline.
- MDN - HTMLCanvasElement.toBlob() - Documents browser canvas encoding and format fallback behavior.