Image Placeholder Generator

Placeholder Image Generator & API

This tool generates SVG placeholder images with customizable width, height, text, colors, font, and font size. Here are some practical use cases:

Lazy-loading placeholder while images are loading:

Random avatar:

Usage

Configuring Placeholder Parameters

Use the control panel on the page to customize the following parameters:

• Width and Height: Set the placeholder image dimensions in pixels
• Display text: Customize the text shown on the image (defaults to the dimensions, e.g., 800×200)
• Background and text color: Choose a color scheme using the color pickers
• Font and font size: Adjust the text font and size

The preview area updates in real time as you adjust parameters.

Using the Generated SVG

The generated placeholder is in SVG format and can be used in several ways:

1. Direct download: Save the SVG file locally and reference it in your project
2. Copy code: Copy the SVG source code and embed it directly in HTML
3. Use the API link: Reference the image via URL without saving any files

Embedding via API URL

The tool provides an API endpoint that dynamically generates placeholder images via URL parameters, making it easy to use directly in code:

https://devtool.tech/api/placeholder/{width}/{height}?text=Text&bgColor=BackgroundColor&color=TextColor

For example:

<img src="https://devtool.tech/api/placeholder/800/200?text=Loading…&bgColor=%23efefef" />

You can also reference it directly in Markdown:

![Placeholder](https://devtool.tech/api/placeholder/400/300?text=Example)

Common Use Cases

1. Lazy-loading placeholders: Display a gray placeholder while images load to prevent layout shift
2. Default avatars: Generate colored avatars with initials for users who haven't set a profile picture
3. UI prototyping: Quickly fill image areas in mockups or during frontend development to focus on layout
4. Documentation: Use placeholder images instead of actual screenshots in technical docs to reduce file size

API

$ https://devtool.tech/api/placeholder/[width]/[height]?text=[Text]&color=[TextColor]&bgColor=[BackgroundColor]

# Example
$ curl https://devtool.tech/api/placeholder/800/200
<svg xmlns="http://www.w3.org/2000/svg" width="800" height="200" viewBox="0 0 800 200">
  <rect fill="#ddd" width="800" height="200"/>
  <text fill="#555" font-family="monospace" dy="12" font-size="50" x="50%" y="50%" text-anchor="middle">800×200</text>
</svg>

FAQ

Q: What format are the generated placeholder images?

The placeholder images generated by this tool default to PNG format. PNG is a lossless compression format that supports transparent backgrounds, making it well suited for UI mockups and web development placeholders. The images are rendered in real time in the browser using the Canvas API — you can download them directly or copy the image link. For scenarios where a smaller file size is needed, consider using an SVG placeholder as an alternative.

Q: Can placeholder images be used in production?

Placeholder images are primarily designed for the development and design phases, serving as temporary stand-ins before real images are loaded. They are very useful for prototyping, UI debugging, and documentation. While technically usable in production, this is not recommended — production environments should use real content or dedicated image placeholder services. The purpose of placeholder images is to help developers quickly build page layouts and verify visual results; once the layout is confirmed, they should be replaced with final assets.

Q: Can I customize the placeholder's appearance?

Yes. This tool supports customizing multiple properties of placeholder images, including width, height, background color, text color, and display text. You can adjust the dimensions to match the actual image area size in your project, set a color scheme consistent with your design mockup, and display dimension labels or custom description text on the image. These parameters can be freely combined to meet different placeholder needs.