Best HTML to Image APIs in 2026
We compared every major way to convert HTML to images — from dedicated APIs to self-hosted Puppeteer to Satori. Here's which one to pick and why.
Last updated: April 2026
Quick Comparison
Side-by-side capabilities at a glance.
Detailed Reviews
An honest look at each option.
1. Rendex
RecommendedRendering API that converts HTML to PNG, JPEG, WebP, or PDF on Cloudflare's edge. Full Chromium rendering with batch support and MCP server.
Strengths
- Full Chromium CSS support — Flexbox, Grid, animations, Google Fonts
- HTML to PNG, JPEG, WebP, and PDF from the same endpoint
- Batch rendering — up to 500 URLs in one request (batch takes URLs; render HTML at scale with concurrent single calls)
- MCP server for AI agent workflows
- Edge-deployed on 300+ Cloudflare locations
- 100 free renders/month, cheapest paid plans in the category
Weaknesses
- New entrant — less established track record
Best overall for HTML-to-image rendering. Full CSS support, multiple output formats, batch processing, and the lowest pricing in the market.
2. Satori + Resvg
Open-source library by Vercel that converts React JSX to SVG, then to PNG via resvg. No browser needed, runs in Node.js or edge functions.
Strengths
- Free and open source
- No browser dependency — runs in Node.js and edge runtimes
- React JSX syntax for templates
- Very fast for simple layouts
Weaknesses
- Flexbox only — no CSS Grid, no animations, no complex layouts
- Fonts must be bundled as binary files
- No PDF output
- No batch processing or API — you build and host it yourself
- Complex HTML may not render correctly
Best for simple social cards in a React/Next.js ecosystem where you don't need full CSS support. Not a general-purpose HTML-to-image solution.
3. Puppeteer (Self-Hosted)
Google's headless Chrome automation library. Run it on your own servers to render HTML to images with full browser capabilities.
Strengths
- Full Chromium rendering — identical to a real browser
- Complete control over the rendering pipeline
- Free and open source
- PDF output supported
Weaknesses
- Requires Chromium install (~400 MB)
- High memory usage per instance (150-300 MB RAM)
- Cold starts in serverless environments
- You manage scaling, concurrency, and browser crashes
- No built-in batch processing or queueing
Best for teams that need full browser control and are willing to manage infrastructure. Not ideal for high-volume production use due to operational complexity.
4. ScreenshotOne
Screenshot API that supports HTML input as one of many features. Primarily focused on URL-to-screenshot capture.
Strengths
- Full Chromium rendering
- HTML input alongside URL screenshots
- Enterprise features — batch, webhooks, S3 upload
- 7 language SDKs
Weaknesses
- 4x more expensive than Rendex for the same volume
- HTML rendering is a secondary feature, not the primary focus
- No edge deployment — higher latency
- Only 100 free calls/month
Capable of HTML-to-image rendering but primarily a screenshot API. If you specifically need HTML rendering, Rendex offers better pricing and a more focused feature set.
5. htmlcsstoimage
Dedicated HTML/CSS to image API. One of the original services in this category, focused specifically on rendering HTML templates.
Strengths
- Purpose-built for HTML-to-image conversion
- Google Fonts support
- Template system for reusable designs
Weaknesses
- Only 3,000 images at $19/mo vs Rendex's 10,000
- No PDF output
- No batch processing
- No MCP server or AI agent support
- No edge deployment
- Smaller free tier (50 vs 100)
A focused HTML-to-image service, but offers significantly fewer renders per dollar compared to Rendex, with no PDF output or batch processing.
Related Use Cases
Frequently Asked Questions
What is the best API for converting HTML to images?
Rendex is the best HTML-to-image API in 2026. Full Chromium CSS, multiple formats (PNG, JPEG, WebP, PDF), batch for 500 URLs, and $6.90/1K renders with 100 free/month.
Can I convert HTML to an image without Puppeteer?
Yes. APIs like Rendex convert HTML to images with a single HTTP request — no Puppeteer, no Chromium install, no infrastructure. Send HTML, get an image.
Does Satori support CSS Grid?
No. Satori only supports Flexbox. If your templates use CSS Grid, animations, or complex selectors, use a Chromium-based renderer like Rendex or Puppeteer.
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See how Rendex compares across the screenshot API landscape.