How Placeholder Image Generator works
This placeholder image generator creates a solid-colour image at any dimensions you specify, with custom text overlaid — useful for filling a layout before real assets exist. Set the width and height in pixels, pick a background and text colour, and either supply your own label or leave it blank to show the dimensions automatically. Everything is drawn on a canvas element inside your browser and downloaded as a PNG, with no request sent anywhere.
How to use it
- 1
Set the Width and Height in pixels, up to 4000 each.
- 2
Pick a Background colour and Text colour, or tick Transparent background to skip the fill.
- 3
Optionally type custom Text — leave it blank to show the dimensions as the label instead.
- 4
Download the generated PNG, sized exactly to your specification.
When you would reach for this
Filling a layout before real images exist
Generate a placeholder at the exact dimensions your image component expects, so you can see spacing, cropping and aspect-ratio behaviour before a designer delivers final assets.
Testing responsive image loading
Create several placeholders at different sizes to test that your srcset or responsive image logic picks the right variant at each breakpoint.
Mocking up a product or content grid
Fill every card in a grid with a distinctly labelled placeholder to check that uneven image dimensions don't break the grid's alignment.
Demonstrating a design system's image slots
Use a transparent placeholder to show exactly where an image slot sits within a component without implying any particular visual weight.
Why this runs as a local canvas rather than a hosted service
Many placeholder tools work by generating a URL that fetches a dynamically rendered image from a remote server every time the page loads — convenient during a demo, but a real liability once that URL ends up baked into a shipped design file, a style guide, or a test fixture that runs in CI. If that third-party service goes down, changes its API, or is blocked by a network policy, every reference silently breaks. This generator instead draws the placeholder directly on an HTML canvas element in your browser and hands you back a real PNG file, so once downloaded it behaves exactly like any other static asset: it works offline, has no dependency on this site staying online, and never phones home.
Choosing dimensions that expose real layout problems
The most useful placeholder size is not the size a design mockup assumes, but a size deliberately different from it. Generating a placeholder taller or shorter than your CSS expects reveals whether an image container clips, stretches or reflows correctly, in a way a conveniently pre-cropped real photo never would. Testing with an unusually wide or unusually narrow aspect ratio in particular is one of the fastest ways to catch a fixed-height image container that will later distort or crop a real photo unpredictably.
Tips
- Generate a few placeholders at intentionally awkward aspect ratios to stress-test your layout, not just the exact size you expect.
- Leave the text field blank so the dimensions are baked into the image itself — useful for spotting which placeholder is which when several are on screen at once.
- Use a transparent background when testing a container that supplies its own background colour or image behind the slot.