FastOG Documentation
FastOG OG image API documentation: quick start, HMAC signatures, and framework tutorials.
Getting started
2Quick Start — Generate Your First OG Image Generate your first dynamic Open Graph image with FastOG in minutes. Dynamic API, subscription-based.FastOG Platform Guide — Every Feature and Where to Change It The merchant guide to FastOG on WooCommerce, Shopify and Wix: covers, looks, live signals, per-product overrides, scoped rules, campaigns, plans, coverage and support.
Core concepts
6HMAC Authentication & Security Secure HMAC-SHA256 signatures for FastOG OG image URLs. Protect your API quota and verify every request.SDK — Download & Use Download the FastOG signer SDK for Node.js, Svelte, PHP, Ruby, and Python. One file per language, zero dependencies, no package manager required.Agent & LLM Integration The complete FastOG client integration contract for developers and AI agents: HMAC canonical signing, one-file SDKs, reference implementations in any language, and a golden vector to self-verify.HMAC Signature Guide How to build HMAC-SHA256 signatures for FastOG by hand, in any language. Step-by-step with examples.HMAC Validation How FastOG validates HMAC-signed OG image requests and the security rules behind it.Signed OG Image URLs Protect your OG image endpoints with signed, expiring URLs (HMAC). HMAC-signed, part of the subscription Dynamic API.
API reference
2OG Image API Reference Full FastOG OG image API reference: endpoints, parameters, authentication, and templates. Generate og:image programmatically.API Errors — How to Fix Each Code Every FastOG API error code explained: what caused it, the HTTP status, and how to fix it. Includes missing_signature, invalid_signature, subscription_required, and render service errors.
Framework guides
12Generate OG Images in Next.js — Dynamic og:image API Generate dynamic OG images in Next.js App Router with FastOG. HMAC-signed URLs, subscription-based.OG Images in Next.js Pages Router Generate Open Graph images in Next.js Pages Router with the FastOG API. HMAC-signed, subscription-based.OG Image Generation for React Apps Generate og:image dynamically from a React app with FastOG. HMAC-signed URLs, part of the subscription Dynamic API.OG Images in SvelteKit Generate Open Graph images in SvelteKit with the FastOG API. Dynamic og:image, HMAC-signed.OG Images in Vue & Nuxt Generate dynamic Open Graph images in Vue and Nuxt with FastOG. Dynamic API, subscription-based.OG Images in Astro Generate Open Graph images in Astro with the FastOG API. Dynamic og:image, HMAC-signed.OG Images from an Express Server Generate OG images from an Express server with FastOG. HMAC-signed URLs, subscription-based.OG Images in Vanilla Node.js (No Framework) Generate og:image in plain Node.js without a framework using FastOG. HMAC-signed, subscription-based.OG Images in PHP & Laravel Generate Open Graph images from PHP and Laravel with the FastOG API. HMAC-signed, subscription-based.OG Images in Python Generate dynamic Open Graph images in Python with FastOG. HMAC-signed URLs, subscription-based.OG Images in Ruby on Rails Generate Open Graph images from Ruby on Rails with the FastOG API. HMAC-signed, subscription-based.OG Images in JavaScript Generate Open Graph images in JavaScript with the FastOG API. HMAC-signed URLs, subscription-based.
Use cases
5OG Images for Blog Posts Generate dynamic OG images for blog posts with the FastOG API. Dynamic API, subscription-based.OG Images for Product Pages Generate Open Graph images for ecommerce product pages with FastOG. Dynamic API, subscription-based.Dynamic OG Images for SaaS Auto-generate dynamic Open Graph images for your SaaS with FastOG. Dynamic API, subscription-based.Generate Twitter Card Images with an API Generate Twitter/X card images programmatically with the FastOG API. Dynamic API, subscription-based.OG Images at Scale Generate og:image at scale for blogs and marketing with FastOG. Dynamic API, subscription-based.
Troubleshooting
8og:image Not Showing? How to Fix It Why your og:image is not showing and how to fix it. Debug dynamic Open Graph images with FastOG.OG Image Size: 1200×630 Explained The correct Open Graph image size (1200×630), why a correct image can still show as a small thumbnail, and which causes are actually fixable.WhatsApp Link Preview Not Showing? Fix og:image WhatsApp link preview not showing, or product photos arriving cropped? The five real causes, how WhatsApp caches previews, and the fix for WooCommerce stores.Social Preview Cache Guide: Facebook, WhatsApp, LinkedIn, X, Slack and Discord Understand which social preview caches you control, which platforms can be re-scraped, and how to diagnose stale OG images without guessing.How to Cache OG Images How to cache dynamic OG images on a CDN and avoid cache-busting issues with social scrapers.Instant WhatsApp Image Update for WooCommerce You cannot force WhatsApp to re-read a link — but you can guarantee the next read serves the new image. How WooCommerce stores update product previews fast.Force a Facebook Open Graph Cache Refresh How to force a Facebook Open Graph cache refresh: the Sharing Debugger, the Graph API scrape endpoint with its app token, and the rate limits to respect.WooCommerce Price Sync in the WhatsApp Preview Your WhatsApp preview shows an old price. The four caches between a price change and a share, what a synced cover reads, and how to verify it.
Comparisons
6Social Preview Plugin Compatibility: WordPress SEO Plugins Compared Compare Yoast, Rank Math, AIOSEO and SEOPress for Open Graph images, cache behavior and WooCommerce product previews without plugin-by-plugin SEO pages.FastOG vs Yoast and Rank Math for WooCommerce OG Images Compare Yoast SEO, Rank Math and FastOG for WooCommerce product social cards, offloaded rendering, speed, templates and Facebook refreshes.FastOG vs Bannerbear: An API or a WooCommerce Plugin? Bannerbear is an image, video and PDF API, and its Open Graph feature sits on the $149 plan with one template per URL. FastOG is a WooCommerce plugin that reads your catalogue itself. Free up to 100 items.FastOG vs Placid: A Toolkit or a WooCommerce Plugin? Placid is a creative automation toolkit with WordPress as one integration among Zapier, Make and n8n. FastOG installs from WordPress.org and reads your catalogue. Free up to 100 items.FastOG vs ogdynamic: A Canvas or a WooCommerce Plugin? ogdynamic is a canvas editor plus an image API with no published pricing. FastOG is a WooCommerce plugin that reads your catalogue itself. Free up to 100 items.OG Image Plugins for WooCommerce Compared (2026) Static SEO images, screenshot capture or catalogue-driven templates? Every OG image plugin for WooCommerce compared, with install counts, free tiers and what each one actually renders.