Image SEO on Blogger: How to Add Alt Text, File Names and Captions (Beginner's Guide)

Most beginner bloggers add pictures to their posts and move on. The image looks fine to a human reader, but to Google it may be a file called IMG_20261107_093512.jpg with no description at all. That is a missed chance, because images can bring visitors from Google Images, help your posts look better in search results, and make your blog easier to use for people with screen readers or slow connections.

This beginner's guide shows you how to do image SEO on Blogger the simple way: choosing useful images, naming files properly, adding alt text and title text in the Blogger editor, writing captions, and checking your results in Search Console. You don't need any paid tools or plugins.

What Image SEO Means (in Plain Words)

Image SEO is the work of helping search engines find your images, understand what they show, and connect them to the right searches. Google's own image guidelines say it learns what an image is about from several clues: the alt text, the file name, captions, image titles and the text around the image on the page. It also uses computer vision, but the words you provide still matter a lot.

Google describes alt text as the most important attribute for giving extra information about an image. So if you only fix one thing after reading this guide, make it your alt text.

Step 1: Use Real, Relevant Images

Before thinking about keywords, ask whether the image actually helps the reader. A screenshot of the exact Blogger menu you are explaining is far more useful than a random stock photo of a laptop.

• Screenshots: Great for how-to posts. Crop them so only the important part shows.
• Your own photos: Best for reviews, food, travel and local stories. A photo of a real market in Onitsha or a phone you tested beats a generic picture.
• Simple graphics: Useful for steps, comparisons and featured images.

Only use images you have the right to use. Copying pictures from other websites without permission can lead to copyright complaints, and it does not make your post more original.

Step 2: Give Your Image File a Descriptive Name

Rename the file on your phone or computer before you upload it. Google says file names give only light clues about an image, but a clear name costs nothing and keeps your own files organised.

1. Use a few words that describe the image.
2. Write in lowercase and separate words with hyphens.
3. Keep it short.

Weak: IMG00023.jpg, image1.png, screenshot.png
Better: blogger-alt-text-box.png, jollof-rice-party-pot.jpg

Also make sure the file extension matches the file type. Google Search supports common formats such as JPEG, PNG, GIF, WebP, SVG, BMP and AVIF, so a normal photo or screenshot is fine.

Step 3: Resize and Compress Before Uploading

Large images slow down your blog, and many readers in Nigeria and across Africa browse on mobile data. A photo straight from a phone camera can be several megabytes. Resize it to a sensible width and compress it before uploading. We explain this in detail, including Blogger's /s1600/ image sizes and lazy loading, in our guide on how to speed up your Blogger blog.

The goal is balance: sharp enough to look good, small enough to load fast. Google notes that clear, high-quality images are more appealing in search thumbnails, so don't shrink your featured image until it looks blurry.

Step 4: Add Alt Text and Title Text in the Blogger Editor

Alt text (alternative text) is a short written description of an image. Screen readers read it aloud, browsers show it if the image fails to load, and Google uses it to understand the picture. Here is how to add it in Blogger:

1. Open your post in the Blogger editor (Compose view).
2. Click the Insert image button and upload your renamed image.
3. Click the image once. A small toolbar appears with size and alignment options.
4. Click the image options button (usually a pencil icon; older versions call it Properties).
5. In the box that opens, fill in Alt text with a clear description of the image.
6. Optionally fill in Title text. This is the small label some browsers show when a mouse hovers over the image. It is less important than alt text.
7. Click OK, then Update or Publish the post.

How to Write Good Alt Text

Google advises writing alt text that is useful and information-rich, uses keywords appropriately and fits the content of the page. It warns against keyword stuffing, which gives a poor experience and may make your site look like spam.

• Missing: no alt text at all.
• Stuffed: "blogger seo blogger tips blogspot seo free blog seo Nigeria".
• Good: "Blogger image options box with the alt text field filled in".

A simple test: if you described the image to a friend over the phone in one sentence, what would you say? That sentence is usually good alt text. Include your topic keyword only when it truly describes the image.

Checking Alt Text in HTML View

If you want to confirm the alt text was saved, switch to HTML view. Your image tag should contain an alt attribute, like this:

<img src="https://blogger.googleusercontent.com/.../blogger-alt-text-box.png" alt="Blogger image options box with the alt text field filled in" />

Google finds images in the src of a normal <img> tag. It does not index images that are only set as CSS backgrounds, so important images should always be inserted as real images, which Blogger's Insert image button does for you.

Step 5: Place Images Near Related Text and Add Captions

Google looks at the content around an image to understand it. Put each image right next to the paragraph or step it explains, not in a random spot.

Captions help too. Readers often scan captions even when they skip paragraphs. To add one in Blogger, click the image and choose Add caption in the image toolbar, then type a short sentence under the picture, for example: "Step 4: the alt text field in Blogger's image options."

Use captions when they add context, such as on screenshots, charts and before-and-after photos. You don't need one on every image.

Step 6: Choose a Strong First Image

Many Blogger themes use the first image in a post as the thumbnail on your home page and as the preview image when the post is shared on Facebook or WhatsApp. Google also chooses preview images automatically and recommends images that are relevant to the page, high resolution and not extremely narrow or overly wide.

1. Place your best, most relevant image at the top of the post.
2. Use a standard landscape shape, such as 1200 x 675 pixels.
3. Give it descriptive alt text like any other image.

Pair the image with a strong title and search description, which we cover in how to write SEO titles and search descriptions on Blogger.

Step 7: Check Image Traffic in Search Console

Once your blog is verified in Google Search Console, you can see how your images perform:

1. Open Search Console and click Performance (Search results).
2. Click Search type at the top and choose Image.
3. Look at the queries and pages that get impressions from Google Images.

Image traffic usually grows slowly on a new blog, so check monthly rather than daily. If you have not set Search Console up yet, follow our guide on how to add Google Search Console to Blogger.

Common Image SEO Mistakes on Blogger

• Leaving alt text empty on important images such as screenshots and product photos.
• Copying the post title into every alt text. Each image shows something different, so describe each one.
• Uploading huge camera photos that make pages slow on mobile data.
• Using images with text as the only source of key information. Search engines and screen readers may miss it, so repeat important points in your paragraphs.
• Using pictures you don't have permission to use.

A Quick Image Checklist for Every Post

1. The image is relevant and genuinely helps the reader.
2. The file has a short, descriptive, hyphenated name.
3. It is resized and compressed for mobile readers.
4. It has clear, natural alt text (title text is optional).
5. It sits next to related text, with a caption where helpful.
6. The first image is strong, relevant and landscape-shaped.

Image SEO takes only a few extra minutes per post. Start by adding alt text to the images in your five most important posts today, then make this checklist part of your routine every time you hit Publish.