OG Image Generator: Create Social Media Preview Images

Published April 6, 2026 · 9 min read

When someone shares your blog post, product page, or article on social media, the preview image is the first thing people see — and it determines whether they click. Open Graph (OG) images are the thumbnails that appear alongside shared links on Facebook, Twitter, LinkedIn, Slack, and dozens of other platforms. A well-designed OG image can increase click-through rates by 30-40%, while a missing or poorly designed one makes your content look amateurish. This guide covers how to create, optimize, and implement OG images that make your links irresistible.

What is an OG Image?

OG (Open Graph) images are defined by the Open Graph protocol, originally created by Facebook and now adopted by virtually every social platform. When you share a URL, social media crawlers read the og:image meta tag from your page's HTML and display that image as the link preview. The same image can appear across multiple platforms, making it one of the highest-leverage design investments for content marketing.

OG Image Dimensions by Platform

Facebook1200 × 630 px (1.91:1)

Twitter/X1200 × 628 px or 1200 × 600 px

LinkedIn1200 × 627 px (1.91:1)

SlackAny ratio, crops to fill

Discord1200 × 630 px recommended

WhatsApp400 × 400 px minimum

Telegram1200 × 630 px optimal

iMessage1200 × 630 px recommended

💡 Universal recommendation: Use 1200 × 630 pixels as your default OG image size. This aspect ratio (1.91:1) works across Facebook, LinkedIn, Twitter, Discord, and most other platforms without cropping.

Design Principles for High-CTR OG Images

1. Bold, Readable Text

Your OG image's primary job is to communicate your content's value in under 2 seconds. Use large, bold text (minimum 60px for headlines) that's readable even at small preview sizes. Sans-serif fonts like Inter, Montserrat, or Poppins work best for screen readability.

2. Strong Visual Hierarchy

Every OG image should have a clear visual hierarchy: headline first, supporting visual second, brand/logo third. Don't try to cram too much information — one clear message beats three competing ones.

3. High Contrast Backgrounds

Social media feeds are busy, colorful environments. Use backgrounds that create contrast with the feed: dark backgrounds (deep blue, black, dark green) stand out in light-themed feeds, while bright backgrounds (yellow, orange, white) grab attention in dark-themed feeds.

4. Brand Consistency

Include your logo or brand mark in a consistent position (typically bottom-right or top-left) on every OG image. This builds brand recognition over time — people start associating your visual style with quality content.

5. Right-Sized Content Area

Keep important text and visuals within a "safe zone" — at least 40px padding from all edges. Social platforms may crop images slightly on different devices, and padding ensures nothing gets cut off.

How to Create OG Images Online

ToolSnap's OG image generator lets you create social preview images from templates or custom designs:

Choose a template or start from scratch — select from pre-designed templates optimized for each platform, or create a custom design with your own dimensions.
Add your content — enter your headline, subtitle, and upload any background images or graphics.
Customize the design — adjust colors, fonts, spacing, and layout. Preview how your image will look on each social platform.
Export and download — generate optimized PNG or WebP files at the correct dimensions for each platform.

Implementing OG Images in HTML

Add these meta tags to the <head> of every page that should have a social preview:

<!-- Open Graph (Facebook, LinkedIn, etc.) -->
<meta property="og:title" content="Your Page Title">
<meta property="og:description" content="Your page description">
<meta property="og:image" content="https://example.com/og-image.png">
<meta property="og:image:width" content="1200">
<meta property="og:image:height" content="630">
<meta property="og:url" content="https://example.com/your-page">
<meta property="og:type" content="article">

<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Your Page Title">
<meta name="twitter:description" content="Your page description">
<meta name="twitter:image" content="https://example.com/og-image.png">

⚠️ Always use absolute URLs for og:image paths. Relative URLs like /images/og.png will fail when social media crawlers try to fetch the image.

Dynamic OG Images

For blogs and content sites with many pages, manually creating unique OG images for each page is impractical. Consider these automated approaches:

Server-side generation: Services like Vercel OG, Cloudinary, or Placid generate OG images dynamically from URL parameters or API calls
Build-time generation: Frameworks like Next.js, Astro, and Gatsby have plugins that generate OG images at build time from page metadata
SVG templates: Create an SVG template with placeholder text and use a serverless function to render it as PNG with the actual title

Testing and Debugging OG Images

Before publishing, always test your OG images with these tools:

Facebook Sharing Debugger: developers.facebook.com/tools/debug/ — shows exactly how your link will appear and forces a cache refresh
Twitter Card Validator: cards-dev.twitter.com/validator — previews your Twitter card and validates markup
LinkedIn Post Inspector: www.linkedin.com/post-inspector/ — checks LinkedIn link previews
Opengraph.xyz: A multi-platform preview tool that shows how your link looks on Facebook, Twitter, LinkedIn, Slack, and Discord simultaneously

Common OG Image Problems

Image not appearing: Check that the URL is absolute and accessible (not blocked by robots.txt or authentication)
Wrong image showing: Social platforms cache OG data. Use the debugging tools above to force a refresh
Image cropped oddly: Ensure your image matches the 1.91:1 ratio. Keep content in the safe zone with adequate padding
Blurry preview: Your image is too small. Use at least 1200px wide images
Text too small to read: Increase font sizes — remember that OG images are displayed at roughly 400-600px wide on mobile feeds

OG Image Best Practices Summary

Use 1200 × 630 px (1.91:1) as the universal standard
Keep file size under 5MB (ideally under 1MB for fast loading)
Use WebP or PNG format for best quality-to-size ratio
Include both og:image and twitter:image meta tags
Always specify og:image:width and og:image:height
Use absolute URLs for all image paths
Test with platform debuggers before launching
Keep text large and bold — mobile feeds show small previews
Maintain brand consistency with consistent templates

Generate OG Images Now

Create stunning social media preview images with ToolSnap's OG image generator. Templates, custom designs, and instant export.

OG Image Generator →

Frequently Asked Questions

What is an OG image?

An OG (Open Graph) image is the preview thumbnail that appears when you share a link on social media platforms like Facebook, Twitter, and LinkedIn. It's defined using the og:image meta tag in your HTML and significantly impacts click-through rates.

What size should OG images be?

The recommended size for OG images is 1200 × 630 pixels (1.91:1 aspect ratio). This works across Facebook, LinkedIn, and most platforms. Twitter/X also accepts this size but displays 2:1 images (1200 × 600px) as large cards.

How do I add OG images to my website?

Add meta tags in your HTML head: og:image (URL), og:image:width (1200), og:image:height (630), og:title, og:description, and twitter:card (summary_large_image). Use absolute URLs for the image path.

Why are my OG images not showing on social media?

Common causes include: using relative URLs instead of absolute, images that are too small (under 200x200px), missing og:image meta tags, not using the correct content type, or cached old images. Use Facebook's Sharing Debugger or Twitter's Card Validator to test and force-refresh.