Renderpix

RenderPix is a developer-first HTML-to-image rendering API built for indie developers and small SaaS teams. Send any HTML via a simple HTTP POST request and receive a pixel-perfect PNG, JPEG, or WebP image in return — no SDKs, no templates, no proprietary markup to learn. How it works RenderPix runs a pre-warmed Chromium browser pool on the backend. Your HTML is rendered exactly as a real browser would display it, then returned as an image. Because the browsers are kept warm, there are no cold starts — rendering typically completes in under a second. Use cases

OG images — dynamically generate Open Graph images for blog posts, product pages, or social shares Invoices & receipts — render HTML invoice templates to pixel-perfect images or previews Certificates — generate personalized certificates at scale Social media visuals — automate the creation of branded images for Instagram, Twitter/X, and LinkedIn posts

Key features

Supports PNG, JPEG, and WebP output Full CSS, web fonts, and modern layout support (Flexbox, Grid) CSS selector-based element capture (Pro+) Full-page screenshots (Pro+) Device scale factor control (up to 3x for retina-quality output) No cold starts — pre-warmed Chromium pool No SDK required — plain HTTP with a single API key Free tier available (100 renders/month)

Bring Your Own HTML Unlike template-based alternatives, RenderPix doesn't lock you into a proprietary template system. You design in HTML and CSS the way you already know — RenderPix just turns it into an image. This makes it a natural fit for teams that already generate dynamic HTML for emails, reports, or dashboards and want to add image export without adding complexity. Pricing starts at $9/month for 2,000 renders. A free tier with 100 renders/month is available with no credit card required.