Placeholder Image Generator
Create custom placeholder images for mockups and prototypes.
How it works
- 1
Enter design values
Input your dimensions, color values, or CSS units into the tool.
- 2
See instant conversion
Review the converted design values and visual preview where available.
- 3
Apply in your project
Copy the final values into your stylesheet, design file, or component.
Common use cases
Hero banner
1920×1080 with custom colors
Thumbnail
150×150 with custom text "Logo"
About This Tool
Generate custom placeholder images with precise dimensions, custom colors, and optional text labels. Perfect for web designers creating mockups, developers building prototypes, or anyone needing temporary image placeholders.
Customization options: Choose exact pixel dimensions from tiny icons to large banners, set background and text colors, add custom text (like dimensions or labels), and download as PNG or JPEG. Create entire sets of placeholder images with consistent styling.
All processing happens in your browser using the Canvas API — no images are uploaded to any server.
Placeholder images are an essential part of the design and development workflow. They fill the space where final images will eventually go, allowing you to prototype layouts, test responsive behavior, and demonstrate designs before real content is available. Unlike external placeholder services that rely on network requests, this tool generates images entirely in your browser, so it works offline and keeps your mockups private.
When building prototypes, placeholder images serve several important purposes. They establish the visual rhythm and spacing of a layout by showing where images will appear and how large they should be. They help stakeholders understand the content structure of a page without being distracted by actual imagery. And they allow developers to test responsive behavior at different image sizes.
The dimensions displayed on the placeholder serve as a visual reminder of the target image size during development. This is particularly useful when working with design systems that specify exact image dimensions for different components like avatars (64x64), thumbnails (150x150), cards (400x300), heroes (1920x600), and banners (1200x400).
Color customization allows your placeholders to match your design system. Using your brand colors or a neutral gray palette makes mockups look more cohesive and professional. The text color is independent of the background color, so you can ensure the dimension label is always readable.
Custom text labels go beyond showing dimensions. Label placeholders with their intended content — "Product Photo", "Team Member", "Blog Hero" — to make your mockups more communicative. This helps designers, developers, and stakeholders stay aligned on what content goes where.
For responsive design testing, generate placeholders at multiple sizes to test how your layout handles different image aspect ratios. A layout that looks great with 16:9 images might break with 4:3 or 1:1 images. Testing with various placeholder sizes catches these issues early.
Tips for effective prototyping: Use a consistent background color across all placeholders for a clean look. Add descriptive text labels to clarify content intent. Generate at actual display size rather than scaled down to get an accurate sense of how images will look in the final layout. Download multiple sizes in quick succession to build a complete set of placeholders for your project.
More examples
Examples
Hero banner
Input
1920×1080 with custom colors
Output
Hero-sized placeholder with centered dimensions
Thumbnail
Input
150×150 with custom text "Logo"
Output
Small square placeholder with "Logo" text
Frequently Asked Questions
- What image formats can I download?
- You can download placeholder images as PNG or JPEG format. PNG supports transparency and lossless quality. JPEG produces smaller file sizes for large images where transparency is not needed.
- Are my images uploaded anywhere?
- No. All image generation happens entirely in your browser using the Canvas API. Nothing is uploaded to any server. This tool works offline and keeps your mockups completely private.
- What sizes can I create?
- Any size from 1×1 to 4000×4000 pixels. Presets are available for common sizes like thumbnails (150×150), cards (400×300), heroes (1920×600), and banners (1200×400). You can also enter any custom dimensions.
- Can I add custom text?
- Yes. You can add custom text labels or show the dimensions automatically. Text color is customizable and independent of the background color. Use descriptive labels like "Product Photo" or "Hero Image" to make your mockups more communicative.
- Why use placeholder images instead of real photos?
- Placeholder images help you focus on layout and spacing without being distracted by actual content. They work without an internet connection, load instantly, and clearly communicate where final images will go. This speeds up prototyping and keeps mockups clean.
- Can I generate multiple placeholders at once?
- Generate each size individually by adjusting the dimensions and downloading. For a complete set of placeholders, use consistent colors and text styling across all sizes to maintain a cohesive look in your mockup.
- What colors should I use for placeholders?
- Use neutral grays (#E5E7EB, #D1D5DB) for a clean, unobtrusive look that does not distract from the layout. Alternatively, use your brand colors at reduced opacity to make mockups feel more connected to the final design. Ensure text has sufficient contrast against the background.