Educational Guide & Technical Specifications
About the HTML to Image
Renders user-supplied HTML and CSS markup inside a security-hardened DOM container, captures layout dimensions, and converts the rendered result into a downloadable PNG graphic.
How to Use the Interface
1
Enter HTML & CSS Code
Paste your HTML markup and CSS styling into the editor panes.
2
Inspect Live Sandbox Preview
Verify layout, colors, typography, and card dimensions in the preview frame.
3
Export PNG Graphic
Click download to generate a clean raster PNG from your rendered code.
Technical Format Specifications
Supported Inputs
- Standard HTML and CSS code snippets
Supported Outputs
- PNG (.png) graphic
Size CeilingCode snippets up to 100 KB
Processing Boundaries & Hardware Constraints
- •External HTTP/HTTPS network resources (such as <img src="http..."> or @import) and executable scripts (<script>, inline onerror event handlers) are stripped by our built-in sanitizer for security and to prevent canvas tainting.
Local Privacy & Data Handling
- Features built-in XSS defense (htmlSanitizer.ts) to eliminate cross-origin data exfiltration and prevent canvas security errors.
- Renders entirely inside the client browser without external network requests.
Common Practical Use Cases
Code Snippet Cards
Render beautiful, syntax-highlighted code cards for documentation and social posts.
Badge & Banner Generation
Design HTML/CSS metric badges, certificates, and testimonial cards for web graphics.
Frequently Asked Questions
Why do external web images or fonts not appear in my render?
To prevent cross-origin data leakage and browser canvas tainting errors, our security sanitizer blocks unauthenticated external HTTP/HTTPS assets. Use inline SVG or data URIs instead.