Perspective Annotator

Overlay a horizon, up to three vanishing points, guides, and an illustrative wireframe cube on a local image, then export a PNG.

What this tool does

Perspective Annotator places a horizon, up to three vanishing points, guide rays, and an illustrative wireframe cube over a local raster image. It is a visual annotation aid, not a calibrated reconstruction tool.

Who this is for

• Artists studying perspective guides on reference images
• Designers marking vanishing points before a drawing or layout
• Students learning how horizon and guide lines relate to a scene

How to use this tool

1. Load a local image
2. Set the horizon, then add or drag vanishing points and use sliders when a point falls outside the image
3. Add and position the illustrative cube
4. Export the annotated canvas as a PNG

Inputs

Inputs include a browser-supported raster image, horizon position, up to three vanishing points, guide controls, and cube placement. Files are read locally with the browser.

Outputs

Export Image downloads a PNG such as perspective_output.png. The page does not save a project, measure real-world dimensions, or upload the source image.

Example use cases

• Mark perspective structure on a photo reference
• Explore off-canvas vanishing points with the sliders
• Export a visual guide for a drawing or design discussion

Frequently asked questions