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Image Watermark

Stamp a text watermark onto photos with full control of position and opacity.

Drag & drop files here

or use the button below · processed locally on your device

Output settings

Free file tool

Free Image Watermark online

Stamp a text watermark onto photos with full control of position and opacity. Use the tool directly in your browser with no sign-up. It supports multiple source files in the same session, so it also works as a free batch tool when you have more than one file.

Free to use

No payment required for this tool.

Batch conversion

Queue multiple source files in one session.

Browser-based

The conversion workflow runs from the web page on your device.

No sign-up

Start the file workflow without creating an account.

What Image Watermark is useful for

  • Preparing images to exact dimensions
  • Correcting orientation or framing
  • Creating a new edited copy while keeping the source

Input and output checks

Accepted input: Text or settings entered on the page.

  • Open the downloaded output before deleting or replacing the source file.
  • Check the details that matter for your use: page count, dimensions, orientation, text, duration or metadata.
  • For batch jobs, confirm every queued file produced the expected output.
  • If quality or size matters, compare more than one settings combination before choosing the final copy.

How to use this calculator: Image Watermark

  1. 1Drag & drop your file onto the upload zone, or tap Browse Files.
  2. 2Review the detected file information — size, type, resolution or page count.
  3. 3Tune the output settings to match what you need.
  4. 4Press Convert and watch the progress bar; processing happens locally in your browser.
  5. 5Download individual results, or use Download All to get a ZIP of everything.

Worked conversion example

Example: place a 40%-opacity text watermark in the lower-right of a 2000 × 1200 image with a 32 px margin. Inspect contrast on both light and dark areas before downloading.

Accepted input
Text or settings entered on the page
Batch behaviour
Multiple files supported

Output settings

SettingExample/defaultEffect
Watermark text© OneCalcAppChanges how the output is encoded or arranged; preview the result before relying on it.
PositionBottom rightChanges how the output is encoded or arranged; preview the result before relying on it.
Opacity (%)45Changes how the output is encoded or arranged; preview the result before relying on it.
Font size (% of width)5Changes how the output is encoded or arranged; preview the result before relying on it.
Colour#ffffffChanges how the output is encoded or arranged; preview the result before relying on it.

How the browser process works

Stamp a text watermark onto photos with full control of position and opacity. The page sends the selected file and settings to its image-watermark browser engine, creates a new output and downloads it without overwriting the source.

Privacy, quality checks and limitations

  • Keep the original file until the downloaded output has been opened and checked.
  • Verify page count, orientation, dimensions, text legibility, audio/video duration and metadata relevant to your use.
  • Browser-local processing reduces routine upload exposure, but your device, browser extensions and download location still matter.
  • A converted preview is not proof of legal authenticity, archival compliance, accessibility or digital-signature validity.

Frequently asked questions

Is Image Watermark free to use?

Yes. You can use Image Watermark on OneCalcApp without paying or creating an account.

Does Image Watermark support batch files?

Yes. This tool accepts multiple source files in the same session so you can process a batch without reopening the page for every file.

Do I need to sign in?

No. The conversion workflow can be used without signing in.

What should I check after conversion?

Open the downloaded output and compare the page count, dimensions, orientation, text readability, duration or other details that matter for your file type before replacing the original.

Does the tool overwrite my original file?

No. The tool creates a new output for download, so keep your original source until you have checked the converted result.

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