How to Optimize Blogger Images for SEO and Speed

Images can make Blogger posts easier to understand, more attractive to readers and eligible to appear in Google Images and other visual search features.

However, poorly optimized images can also slow down your website, cause layout shifts and provide search engines with very little information about what the image represents.

This guide explains how to optimize Blogger images for SEO using descriptive filenames, useful alt text, appropriate dimensions, image compression, WebP, responsive sizing and lazy loading.

Why Image SEO Matters in Blogger

Search engines can use several signals to understand an image, including:

• The image itself
• Alt text
• Filename
• Nearby text
• Page topic
• Structured data

Optimizing these elements can help Google understand how an image relates to the surrounding article.

Good image optimization also improves usability and page performance, especially for visitors using mobile devices or slower connections.

1. Use Descriptive Image Filenames

Rename images before uploading them to Blogger whenever practical.

A filename such as:

IMG_8492.jpg

provides little context.

A better filename would be:

blogger-seo-settings-guide.webp

or:

add-custom-domain-blogger-dns.webp

Keep filenames short, descriptive and relevant to the actual image.

Use hyphens between words rather than creating long keyword-heavy filenames.

2. Add Useful Alt Text to Blogger Images

The alt attribute describes an image when it cannot be seen and helps search engines understand its subject and context.

For example:

<img
  src="blogger-sitemap-search-console.webp"
  alt="Blogger sitemap submitted successfully in Google Search Console">

A good alt description should explain what is actually visible or important about the image.

Avoid descriptions such as:

alt="Blogger SEO Blogger tips Blogger SEO tutorial best Blogger SEO images SEO Google ranking"

This is keyword stuffing and provides a poor accessibility experience.

How to Add Alt Text in Blogger

When editing a Blogger post, select the image and use the available image properties or settings to provide alternative text where supported.

You can also check the image in HTML view.

The final markup should contain:

alt="A useful description of the image"

For important images, always verify the published page rather than assuming the description was added correctly.

3. Don't Add Keywords to Every Image Alt

Not every image needs your primary keyword.

For example, if an article is about connecting Blogger to Search Console and a screenshot shows the Sitemaps screen, an appropriate alt might be:

Google Search Console Sitemaps screen for a Blogger website

You do not need:

Best Blogger SEO Google Search Console Blogger sitemap SEO optimization tutorial

Write alt text for the image first. Keyword relevance should occur naturally when the image genuinely relates to the article topic.

4. Place Images Near Relevant Content

Image SEO is not based on the image file alone.

Place images close to the text they support.

For example, a screenshot showing Blogger's Meta tags settings should appear near the section explaining:

Blogger → Settings → Meta tags

rather than in an unrelated section at the bottom of the article.

Relevant surrounding text gives both visitors and search engines better context.

5. Resize Images Before Uploading Them

Avoid uploading extremely large images when the article displays them at a much smaller size.

If your main article content is approximately 740 pixels wide, uploading a 4000-pixel screenshot is often unnecessary.

For example, our article images commonly use:

width="740"
height="416"

The dimensions you choose should match your design and the amount of detail required by the image.

Smaller appropriately sized images generally require less data to download.

6. Compress Images Before Uploading

Image dimensions and image file size are different.

Two images can both be 740 × 416 pixels but have very different file sizes depending on compression and format.

Before uploading:

• Remove unnecessary image data.
• Use appropriate compression.
• Avoid exporting screenshots at excessive quality.
• Check that text remains readable after compression.

The goal is to reduce file size while keeping the image visually clear.

7. Use WebP Images in Blogger

WebP can provide good image quality at relatively efficient file sizes and is supported by Google Search.

A typical optimized Blogger image filename might be:

blogger-page-speed-guide.webp

Blogger also provides a WebP image serving option for images in posts and pages in current Blogger configurations.

You can check:

Blogger → Settings → Posts

and enable WebP image serving if the option is available for your blog.

Remember that theme images such as logos, icons and custom homepage images may still need to be optimized through the theme itself.

8. Add Width and Height Attributes

Include image dimensions in the HTML whenever possible.

For example:

<img
  src="blogger-image-seo.webp"
  alt="Blogger image SEO example"
  width="740"
  height="416">

These attributes help the browser understand the image's aspect ratio and reserve space before the file finishes loading.

This can reduce unexpected movement on the page and help improve visual stability.

9. Make Blogger Images Responsive

Images should shrink correctly when the screen becomes narrower than their original dimensions.

A common responsive CSS rule is:

img {
  max-width: 100%;
  height: auto;
}

This allows a 740-pixel image to display at a smaller width on a phone without stretching vertically.

The HTML can still retain:

width="740" height="416"

while CSS handles the responsive display size.

If you are fixing broader mobile-layout issues, see our Blogger mobile responsive guide.

10. Lazy Load Below-the-Fold Images

Images that visitors do not see immediately can usually use native browser lazy loading:

loading="lazy"

For example:

<img
  alt="Blogger SEO example"
  height="416"
  width="740"
  src="blogger-seo-example.webp"
  loading="lazy"
  decoding="async">

Current Blogger settings can automatically add lazy loading to images inside posts and pages when the feature is enabled.

Check:

Blogger → Settings → Posts → Lazy load images

This behavior applies to post/page content. Images coded directly into your theme may need to be handled separately.

11. Don't Lazy Load Important Above-the-Fold Images

Lazy loading is useful, but it should not automatically be applied to every image.

If an important image is immediately visible when a page opens and becomes the page's Largest Contentful Paint element, delaying it can hurt perceived loading performance.

For an important top-of-page image, you may instead use:

loading="eager"

or simply allow normal browser loading.

Use lazy loading primarily for images further down the page.

12. Use Standard HTML Image Elements

For important content images, use the standard HTML:

<img src="image.webp" alt="Description">

rather than displaying an important article image only as a CSS background.

Standard image elements provide search engines with clear image URLs and allow you to specify useful attributes such as:

• alt
• width
• height
• loading
• srcset

CSS background images are better suited to decorative design elements.

13. Use Responsive Image Sources When Appropriate

Responsive images allow browsers to choose an image size that better matches the visitor's device.

Standard HTML supports techniques such as:

srcset

and:

sizes

For example:

<img
  src="blogger-guide-740.webp"
  srcset="blogger-guide-480.webp 480w,
          blogger-guide-740.webp 740w"
  sizes="(max-width: 600px) 100vw, 740px"
  alt="Blogger tutorial screenshot">

Always retain a normal src URL as the fallback image.

For many Blogger users, Blogger's hosted-image sizing already handles much of this automatically, so do not introduce complicated responsive markup unless your theme needs it.

14. Use Captions When They Help the Reader

A caption is not required for every image, but it can provide useful context for screenshots, charts, comparisons and instructional images.

For example:

Google Search Console showing a successfully submitted Blogger sitemap.

Do not add repetitive captions only to insert keywords.

Use them when they genuinely make the image easier to understand.

15. Avoid Putting Important Text Only Inside Images

An image containing text can be useful visually, but important instructions should also exist as real HTML text in the article.

For example, if a screenshot contains:

Blogger → Settings → Crawlers and indexing

include those instructions in the surrounding article as well.

This makes the content easier to search, copy, translate and access with assistive technologies.

16. Use High-Quality Images Without Excessive File Size

Do not reduce image quality so aggressively that screenshots become unreadable or photographs become visibly damaged.

Google recommends balancing image quality with loading performance.

A useful SEO image should be:

• Relevant
• Clear
• Readable
• Properly sized
• Efficiently compressed

The smallest possible file is not necessarily the best image if visitors cannot understand it.

17. Optimize Your Main Post Image

The main image used for a Blogger article deserves particular attention because it may also be used for:

• Homepage thumbnails
• Social sharing
• Structured data
• Search-result image previews
• Google Discover

Choose an image that accurately represents the page rather than a generic website logo.

For BloggerTheme9 tutorial articles, a descriptive 16:9 image such as:

740 × 416

provides a consistent article-image format while remaining suitable for responsive layouts.

18. Test Image Performance With PageSpeed Insights

After publishing an image-heavy post, test it with PageSpeed Insights.

Look for issues such as:

• Oversized images
• Slow Largest Contentful Paint images
• Missing dimensions
• Images loaded before they are needed

For a broader performance checklist, see our Blogger page speed optimization guide.

Blogger Image SEO Checklist

1. Use descriptive image filenames.
2. Add useful, contextual alt text.
3. Avoid keyword stuffing.
4. Place images near relevant content.
5. Resize images before uploading.
6. Compress images without making them unclear.
7. Use WebP when appropriate.
8. Add width and height attributes.
9. Keep images responsive.
10. Lazy-load images below the initial viewport.
11. Avoid lazy-loading important LCP images.
12. Use normal HTML image elements for important content.
13. Use captions when they add useful context.
14. Keep important text available as HTML text.
15. Test image-heavy pages for performance.

For the rest of your Blogger search configuration, see our complete Blogger SEO settings guide.

Questions About Blogger Image SEO

How do I optimize images for Blogger SEO?

Use descriptive filenames and alt text, place images near relevant content, resize and compress them, include width and height, make them responsive and lazy-load below-the-fold images where appropriate.

Does image filename matter for SEO?

A descriptive filename can provide search engines with a small amount of additional context about an image. Use short descriptive names instead of generic filenames such as IMG0001.jpg.

What should I write in Blogger image alt text?

Describe the image clearly and in the context of the article. Use relevant terms naturally, but do not fill alt text with repeated SEO keywords.

Is WebP good for Blogger images?

Yes. WebP is supported by Google Search and can provide good image quality at efficient file sizes. Blogger also provides WebP serving for supported post and page images.

Should I add width and height to Blogger images?

Yes. Image dimensions help browsers reserve space before images load, which can improve page stability. Responsive CSS can still allow the image to shrink on smaller screens.

Should all Blogger images use loading="lazy"?

No. Lazy loading is useful for images further down the page, but an important above-the-fold image may need normal or eager loading so it does not delay the page's main visual content.

Can Blogger images appear in Google Images?

Yes. Images on crawlable, indexable Blogger pages can be discovered by Google. Descriptive alt text, relevant surrounding content, standard image markup and good image quality can help Google understand them.

Final Recommendation

Good Blogger image SEO is not about adding keywords to every filename and alt attribute.

Use images that genuinely support the article, give them descriptive filenames and useful alt text, place them near relevant content and optimize their size and loading behavior.

Also remember that image SEO and page performance work together. A relevant, high-quality image is useful, but a multi-megabyte image that slows down the entire article creates a worse experience.

Optimize Blogger images for people first: make them relevant, accessible, responsive and fast. Those same practices also give search engines better information about your visual content.