How to change the default post image and meta tags in Dia Root (step-by-step)

This guide walks you through two small but powerful tweaks that improve how your blog looks on social networks and how search engines understand your site:

replace the default post image (the fallback image shown when a post has no featured image), and 2) add or refine meta tags (description, OG/Twitter tags, etc.). I’ll use the name Dia Root throughout — if you use the Arabic name فرصة تكنو, the steps are identical.

Why this matters: a meaningful default image prevents bland shares with empty thumbnails, and good meta tags increase click-throughs and make shares look professional. Both changes take only a few minutes but deliver big UX and SEO benefits.

Before you start — safety first

Backup your current theme. Dashboard → Theme → three-dots → Backup/Restore → Download.
Work carefully in Theme → Edit HTML. A small edit can break layout, so save a copy of your original .xml first.
Use HTTPS image URLs only (no http://). Mixed content breaks previews.

Part A — Change the default post image (fallback image)

What is the default post image?

When a post has no featured image, the template shows a fallback/default image. Replacing that image with one that reflects your brand makes all post shares look consistent and attractive.

Step-by-step

Upload the image you want to use
- Recommended hosting: upload it to your blog (create a draft post, insert the image, then copy the image URL from the editor) or use your own domain/CDN or a trusted host (Imgur, Cloudinary, etc.).
- Recommended size: 1200 × 630 px (ideal for social sharing), keep file < ~150 KB for speed. Use JPG/WebP; PNG only for logos with transparency.
Open the template editor
- Blogger Dashboard → Theme → Edit HTML.
Find the fallback image code
- Press Ctrl+F and search for common keywords: no-image, no_image, default-image, default_thumb, placeholder, or og:image. Templates vary; Dia Root often uses a no-image or no-image.png string.

Replace the URL

You will find a URL like https://example.com/assets/no-image.jpg. Replace it with your new image URL.
Example replacement (inside template JS or HTML):

<!-- before -->
var defaultImage = 'https://example.com/assets/no-image.jpg';

<!-- after -->
var defaultImage = 'https://cdn.yoursite.com/images/diaroot-default-1200x630.jpg';

Or the template may have a static meta fallback like:

<meta property="og:image" content="https://example.com/assets/no-image.jpg"/>

Replace that value with your new URL.

Save and test
- Save the template change, open a post without an image and confirm the new fallback appears.
- Test social preview (see below).

Part B — Add or refine meta tags (SEO & social sharing)

Meta tags live in the <head> section and tell search engines and social platforms what title, description, and image to show.

Where to put them

Blogger → Theme → Edit HTML → find the closing </head> (or search for <head>). Add or edit meta tags between <head> and </head>.

Basic meta tags to add (static defaults)

Paste these as a default for your site (replace the example text and URLs):

<!-- Basic -->
<meta name="description" content="Short, clear description of your blog — ~120–155 characters.">
<meta name="keywords" content="blogger templates, dia root, seo, tech blog">

<!-- Open Graph (Facebook, LinkedIn...) -->
<meta property="og:type" content="website" />
<meta property="og:title" content="Dia Root — Modern Blogger Template" />
<meta property="og:description" content="A lightweight, SEO-friendly Blogger template for creators and writers." />
<meta property="og:image" content="https://cdn.yoursite.com/images/diaroot-default-1200x630.jpg" />
<meta property="og:url" content="https://www.yoursite.com/" />

<!-- Twitter Card -->
<meta name="twitter:card" content="summary_large_image" />
<meta name="twitter:title" content="Dia Root — Modern Blogger Template" />
<meta name="twitter:description" content="A lightweight, SEO-friendly Blogger template for creators and writers." />
<meta name="twitter:image" content="https://cdn.yoursite.com/images/diaroot-default-1200x630.jpg" />

Dynamic tags for posts (optional, advanced)

Ideally, posts show their own title, description, and featured image. Some templates already provide dynamic tags. If yours doesn’t, you can add conditional tags so a post uses its own image and description, and the site uses the default otherwise. Because Blogger templates differ, ask (or tell me) if you want the exact dynamic snippet for Dia Root — I can craft it specifically for your template.

Best practices for meta tags & images

OG image size: 1200 × 630 px (minimum 600 × 315 px). Keeps social previews crisp.
File size: under 150 KB where possible. Compress images (TinyPNG, Squoosh, or WebP).
Description: 120–155 characters, include your top keywords but keep it natural.
Twitter card: use summary_large_image to show a big image on Twitter.
Canonical URL: add <link rel="canonical" href="https://www.yoursite.com/" /> for homepage or posts where needed.

Test your changes

Facebook Sharing Debugger: paste a post URL to refresh Facebook's cache and preview the OG result.
Twitter Card Validator: preview Twitter card.
Google Rich Results / Mobile-friendly: check structured data and mobile rendering.
Manual check: open a post without a featured image, right-click the share preview to ensure the fallback image appears.

Final notes & troubleshooting

If changes don’t show in social previews, clear caches and use the debug tools to force a re-scrape.
If you can’t find the no-image string, the template may generate the image from JavaScript; still search for og:image, default, or placeholder.
Always keep a backup of your original .xml. If something breaks, restore and try again.

Diaa Root Template