Placeholder Image Generator
Generate custom placeholder images for wireframes and mockups. Set size, colours, and custom text.
Why Placeholder Images Matter in Design
Every designer and developer hits the same wall: you're building a layout, but the real images aren't ready yet. You could leave empty boxes, but that gives you zero sense of how the final page will actually feel. Placeholder images solve this by filling those gaps with correctly-sized graphics that show exactly where content will go.
Think of placeholders like scaffolding on a building site. They aren't the finished product, but they let you see the proportions, test the spacing, and catch layout issues before the real materials arrive. Without them, you're designing blind.
This generator creates placeholder images entirely in your browser using the Canvas API. Nothing gets uploaded — you pick your dimensions, colours, and optional text, then download a PNG instantly.
Common Placeholder Sizes
These are the dimensions you'll reach for most often, based on standard web and social media layouts:
| Use Case | Width | Height | Aspect Ratio |
|---|---|---|---|
| Hero Banner | 1920 | 1080 | 16:9 |
| Blog Featured Image | 1200 | 630 | ~1.9:1 |
| Open Graph / Social Share | 1200 | 630 | ~1.9:1 |
| Product Thumbnail | 400 | 400 | 1:1 |
| Avatar / Profile Picture | 200 | 200 | 1:1 |
| Instagram Post | 1080 | 1080 | 1:1 |
| YouTube Thumbnail | 1280 | 720 | 16:9 |
| Mobile App Icon | 512 | 512 | 1:1 |
What this means for you: Keep this table handy when starting a new project. Using the right placeholder size from day one means fewer layout surprises when real images arrive.
When to Use Placeholder Images
Wireframing
Low-fidelity layouts need image placeholders to communicate structure to stakeholders. Solid-colour blocks with dimension labels make proportions clear at a glance.
Frontend Development
When building components before assets are ready, placeholder images let you test responsive behaviour, lazy loading, and image containers with real dimensions.
Client Presentations
Custom-coloured placeholders that match a brand palette look far more professional than random stock photos or broken image icons in a mockup.
Documentation & Tutorials
When writing guides or README files, placeholder images demonstrate layout examples without requiring actual photography or licensed assets.
Tips for Better Placeholders
Match your brand colours. Using your project's background and accent colours in placeholders gives stakeholders a much more accurate preview. Generic grey boxes tell them nothing about the final feel.
Add descriptive text. Instead of just showing "800 × 600", add labels like "Hero Image" or "Product Photo" so anyone looking at the layout knows what goes where.
Use the right aspect ratio. If your final images will be 16:9, don't test with 1:1 placeholders. Mismatched ratios hide cropping and overflow issues that'll bite you later.
Generate at the actual display size. Creating a 4000×3000 placeholder for a 400×300 thumbnail wastes filesize and doesn't test the real rendering path. Match the intended display dimensions.
This Tool vs URL-Based Services
| Feature | This Tool | URL Services (placehold.co, etc.) |
|---|---|---|
| Works offline | Yes — runs in browser | No — requires internet |
| Custom colours | Full colour picker | Limited to hex codes in URL |
| Custom text | Any text, font size | URL-encoded text only |
| Download file | PNG download | Linked via URL (no download) |
| Use in HTML/CSS | Need to host the file | Direct URL in src attribute |
Use this tool when you need a downloadable file with custom branding. Use URL-based services when you want quick inline placeholders in HTML prototypes that don't need to persist.
Related Tools
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Aspect Ratio Calculator
Calculate and convert aspect ratios
Colour Palette Generator
Generate colour schemes for your placeholders
Image to WebP
Convert images to WebP format
How to use this tool
Set your desired width and height in pixels
Choose background and text colours to match your project
Click Generate Image, then download the PNG
Common uses
- Creating correctly-sized placeholders for wireframes and mockups
- Testing responsive image layouts during frontend development
- Filling design prototypes before real photography is available
- Generating branded placeholder graphics for client presentations
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