HTML/CSS to Image API
Converts HTML and CSS markup into PNG, JPEG, or WebP images and PDFs via a simple REST API.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Basic Auth credentials must be kept secret; no scope-based key restrictions; SSRF risk exists if user-controlled URLs are passed in HTML.
⚡ Reliability
Best When
You control the HTML/CSS markup and need consistent, fast image rendering from structured content.
Avoid When
You need to capture a live authenticated web page with complex client-side rendering.
Use Cases
- • Generate dynamic social media cards or OG images from HTML templates with injected data
- • Render HTML email previews as images for visual QA in automated testing pipelines
- • Create PDF reports from HTML/CSS layouts for automated document generation agents
- • Produce pixel-perfect image thumbnails of data dashboards or charts rendered in HTML
- • Automate certificate or badge creation using HTML templates with variable data
Not For
- • Taking screenshots of live, interactive websites with complex JavaScript state
- • Video generation or animated GIF creation
- • Bulk scraping of web pages for data extraction
Interface
Authentication
HTTP Basic Auth using User ID as username and API key as password; straightforward for agent integration.
Pricing
Unused credits do not roll over; overage charges apply above plan limits.
Agent Metadata
Known Gotchas
- ⚠ External resources (fonts, images, stylesheets) referenced in HTML must be publicly accessible or base64-encoded inline
- ⚠ JavaScript execution is limited; complex JS-driven rendering may produce incomplete results
- ⚠ Very large or complex HTML documents can hit timeout limits (default ~30s)
- ⚠ Google Fonts require explicit selector_wait_for or delay parameters to load before capture
- ⚠ The ms_delay parameter is required for pages with CSS animations or transitions to render correctly
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for HTML/CSS to Image API.
Scores are editorial opinions as of 2026-03-06.