Efficient compression
Deliver high-quality rendered images with smaller files than many traditional image formats.
HTML to WebP API
Convert HTML and CSS to WebP
Send HTML and CSS to the API and receive a hosted .webp image URL. HCTI manages Chromium, rendering, storage, and delivery.
- HTML, CSS, and JavaScript
- Hosted .webp image URL
- Viewport and browser controls
View example
Request
Live demo
Turn HTML and CSS into a WebP image
Edit the HTML and CSS, choose the image settings, and render a WebP with the same API used in production.
Format advantages
Why generate WebP images from HTML?
WebP combines modern compression with high visual quality, making it a strong default for images delivered on the web.
Transparency support
Keep transparent areas in HTML designs while benefiting from a web-focused output format.
Built for the modern web
Use WebP for product UI, content feeds, responsive sites, and performance-sensitive delivery.
HTML to image API
Request WebP output directly
Send HTML and CSS to the API with the format set to webp. Chromium renders the content and the response URL points to the generated .webp image.
-
HTML and CSS input
Send complete markup and styles, including browser-supported fonts, images, SVG, and JavaScript.
-
WebP output
Set format to webp and use the hosted .webp URL returned by the API.
-
Viewport and crop controls
Set viewport dimensions and device scale, or crop the result to a CSS selector.
-
Page environment
Choose light or dark mode, timezone, and screen or print media.
Request
How it works
From markup to a finished WebP
-
Send HTML and CSS
Submit the content with format set to webp and any viewport or browser settings.
-
Chromium renders the design
The API loads the markup, styles, fonts, and assets in a managed browser environment.
-
Use the .webp URL
Embed the hosted result, download the file, or save it in your own storage and application records.
Output formats
One API, the format your workflow needs
Keep the same HTML and CSS. Choose lossless detail, compact compatibility, modern web delivery, or a paginated document.
Looking to capture a webpage as WebP? Explore URL to WebPLossless + transparent
Compact + universal
Document + printable
.png
HTML to PNG
Crisp text, sharp UI details, and transparent backgrounds for designed graphics.
Explore PNG.jpeg
HTML to JPEG
Smaller files and broad compatibility for photography, previews, and content-heavy pages.
Explore JPEG.pdf
HTML to PDF
Paginated documents with page sizing, margins, backgrounds, and print styles.
Explore PDFExample code
Create a WebP image from your app
Choose a language and copy a complete request using this page's simple HTML and CSS example.
Loading code example
const apiId = process.env.HCTI_API_ID;
const apiKey = process.env.HCTI_API_KEY;
if (!apiId || !apiKey) {
throw new Error("Missing HCTI_API_ID or HCTI_API_KEY");
}
const authorization = `Basic ${Buffer.from(`${apiId}:${apiKey}`).toString("base64")}`;
const request = {
html: `<div class="card">
<h1>Hello, world!</h1>
<p>Generated from HTML and CSS.</p>
</div>`,
css: `.card {
width: 480px;
padding: 40px;
background: #f0fdf4;
color: #052e16;
font-family: sans-serif;
}`,
format: "webp",
};
const response = await fetch("https://hcti.io/v1/image", {
method: "POST",
headers: {
Authorization: authorization,
"Content-Type": "application/json",
},
body: JSON.stringify(request),
});
if (!response.ok) {
throw new Error(`HCTI request failed: ${response.status} ${await response.text()}`);
}
const result = await response.json() as { url: string };
console.log(result.url);
Loading code example
Loading code example
Loading code example
Loading code example
Loading code example
Loading code example
Loading code example
Loading code example
Ready to render?
Create your first WebP from HTML and CSS
Send HTML and CSS to the API and receive a hosted .webp image URL without running browser infrastructure.