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Placeholder Image Generator

Generate custom placeholder images of any size for design mockups and prototypes.

What is the Placeholder Image Generator?

The placeholder image generator draws a simple grey image at the exact width and height you ask for, with the dimensions printed in the middle (like 640x480). It is the stand-in you drop into a mockup while the real artwork is still missing, so layouts keep their spacing and proportions.

The image is drawn on an HTML canvas and handed back as a base64 PNG data URL plus a live preview. Everything happens in your browser - no request is made and nothing is uploaded.

How to use the placeholder image generator

  • 1. Enter a width and height in pixels (1-2000 each).
  • 2. Click Generate.
  • 3. Copy the Data URL and paste it into an img src, or use the preview to check the size.

Features

  • Any size up to 2000 x 2000 pixels.
  • Grey background with the dimensions labelled on the image.
  • Output is a self-contained base64 PNG data URL - no hosting needed.
  • Live preview of the generated image.
  • Runs in your browser - nothing is uploaded.

Common uses

Filling image slots in a wireframe or mockup, reserving space in an email or landing-page draft, testing how a layout reflows at different aspect ratios, or standing in for a product photo in a prototype. Because the result is a data URL, it works offline and needs no external placeholder service.

The grey fill and centred size label make it obvious at a glance that the slot is a placeholder rather than final art, so nobody mistakes the mockup for a finished design.

FAQ

What format is the image?

A PNG, returned as a base64 data URL. You can paste it directly into an image src attribute or CSS without hosting a file anywhere.

What is the maximum size?

Up to 2000 by 2000 pixels. Enter any width and height in that range and the label updates to match.

Does it call a placeholder service?

No. The image is drawn locally on an HTML canvas in your browser, so it works offline and makes no network request.

Is anything uploaded?

No. The whole image is generated in your browser and never sent to our server.

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