Getting the best results from HTML to image conversion requires understanding how the rendering works and designing your templates accordingly.
Designing for Fixed Dimensions
Unlike responsive web pages, image templates have fixed dimensions. Design for the exact output size—1200x630 for OG images, 1080x1080 for Instagram squares. Use pixel values rather than percentages. Set explicit width and height on the container element to ensure consistent sizing.
Font Considerations
Web fonts work well but need time to load. Use Google Fonts or other reliable CDNs. Include fallback fonts for reliability. System fonts (Arial, Georgia) render instantly. For critical text, test that fonts load correctly before generating production images.
Using Flexbox and Grid
Modern CSS layout tools (flexbox, grid) work excellently for image templates. Center content vertically and horizontally with flexbox. Create complex layouts with CSS grid. These techniques are more reliable than absolute positioning for dynamic content that varies in length.
Image Quality and Format
Choose PNG for graphics with transparency or sharp edges (text, logos). Choose JPEG for photographs with smaller file sizes. Higher resolutions look better but take longer to render. For social media, match platform recommended dimensions exactly for best display.