How to Add Code Highlighting to Blogger Without Plugins
Most rich-text editors offer a feature that allows you to select specific content and format it as a code block, often with syntax highlighting. However, Blogger's built-in post editor does not provide this functionality, and I really needed it for my technical blog.
So, how could I implement code highlighting in Blogger without replacing the existing editor?
I initially came up with two ideas:
The best solution would have been to replace the editor with another rich-text editor. Unfortunately, Blogger does not provide an option to switch between different editors.
The second option was slightly less ideal: modify the existing editor's source code to add a code block button and the logic required to display syntax highlighting. Unfortunately, Blogger does not provide a way to directly modify the editor's source code either.
Both approaches had reached a dead end.
I asked AI for alternative ideas. After some research, it suggested using a Google Chrome extension. However, I immediately abandoned that idea. The reasons were simple: I didn't know how to develop a browser extension, and I didn't want to go through all that trouble just to highlight a few code blocks.
Once again, I seemed to be stuck.
Fortunately, there is always another way! After exploring a different approach, I finally found a solution that worked for my needs.
The idea was actually quite simple: Blogger allows us to customize the styles of our blog theme. So, why not choose an existing HTML element and modify its appearance to make it look like a highlighted code block?
Here are the steps I followed.
First, I looked at the formatting options available in Blogger's built-in post editor and selected a feature I rarely used.
I chose Subheading, which uses the <h4> HTML tag in my theme.
I normally use only the main heading, heading, and normal text styles when writing posts, so I almost never use the subheading option. That made it a convenient choice for repurposing as a code block style.
Next, I opened the Blogger dashboard, navigated to Theme, and selected the option to edit the theme's HTML.
Before making any changes, I recommend backing up your theme. This gives you a way to restore the original version if you accidentally modify or delete something important.
In the theme's HTML editor, search for the following closing tag:
Insert your custom CSS code immediately before this tag, then save the theme.
The CSS should target the <h4> elements used in your blog posts and change their appearance to resemble highlighted code blocks.
/* Blogger 次标题 h4：VS Code 深色高亮效果 */
For example, you can customize the background color, text color, font family, padding, and borders to create a dark code-block style.
Now, return to your Blogger post editor.
Select a line of text or a command that you want to highlight, then apply the Subheading formatting option.
Open the published post to see the result. The selected content should now display using the custom style defined in your theme.
That's it! I was able to create a code-block-like appearance without installing a browser extension or modifying Blogger's built-in editor.
This approach takes advantage of Blogger's existing formatting options rather than trying to modify the editor itself.
It is a simple workaround for bloggers who need visually distinct code snippets but don't want to develop browser extensions or introduce additional tools.
One important limitation is that this method changes the visual appearance of the selected text; it does not provide true programming-language syntax highlighting. It also affects other content using the same heading style unless you apply more specific CSS rules.
Even so, for my particular needs, this was a practical way to make code snippets stand out in Blogger posts without adding unnecessary complexity.
So, how could I implement code highlighting in Blogger without replacing the existing editor?
I initially came up with two ideas:
- Switch to a different rich-text editor.
- Add a code block feature to the existing editor.
The best solution would have been to replace the editor with another rich-text editor. Unfortunately, Blogger does not provide an option to switch between different editors.
The second option was slightly less ideal: modify the existing editor's source code to add a code block button and the logic required to display syntax highlighting. Unfortunately, Blogger does not provide a way to directly modify the editor's source code either.
Both approaches had reached a dead end.
I asked AI for alternative ideas. After some research, it suggested using a Google Chrome extension. However, I immediately abandoned that idea. The reasons were simple: I didn't know how to develop a browser extension, and I didn't want to go through all that trouble just to highlight a few code blocks.
Once again, I seemed to be stuck.
Fortunately, there is always another way! After exploring a different approach, I finally found a solution that worked for my needs.
The Solution: Customize an Existing Blogger Heading Style with CSS
The idea was actually quite simple: Blogger allows us to customize the styles of our blog theme. So, why not choose an existing HTML element and modify its appearance to make it look like a highlighted code block?
Here are the steps I followed.
Step 1: Choose an Infrequently Used Formatting Option
First, I looked at the formatting options available in Blogger's built-in post editor and selected a feature I rarely used.
I chose Subheading, which uses the <h4> HTML tag in my theme.
I normally use only the main heading, heading, and normal text styles when writing posts, so I almost never use the subheading option. That made it a convenient choice for repurposing as a code block style.
Step 2: Open the Blogger Theme HTML Editor
Next, I opened the Blogger dashboard, navigated to Theme, and selected the option to edit the theme's HTML.
Before making any changes, I recommend backing up your theme. This gives you a way to restore the original version if you accidentally modify or delete something important.
Step 3: Add Custom CSS to the Theme
In the theme's HTML editor, search for the following closing tag:
</b:skin>
Insert your custom CSS code immediately before this tag, then save the theme.
The CSS should target the <h4> elements used in your blog posts and change their appearance to resemble highlighted code blocks.
/* Blogger 次标题 h4：VS Code 深色高亮效果 */
.post-body h4 {
box-sizing: border-box;
background: #1e1e1e !important;
color: #d4d4d4 !important;
font-family: Consolas, "Courier New", monospace;
font-size: 14px;
font-weight: 400;
line-height: 1.7;
padding: 12px 16px;
margin: 16px 0;
border: 1px solid #333333;
border-radius: 8px;
overflow-wrap: anywhere;
}
/* 移除标题原有装饰 */
.post-body h4::before,
.post-body h4::after {
content: none !important;
}
@media (max-width: 600px) {
.post-body h4 {
font-size: 13px;
padding: 10px 12px;
}
}
For example, you can customize the background color, text color, font family, padding, and borders to create a dark code-block style.
Step 4: Use the Subheading Style as a Code Block
Now, return to your Blogger post editor.
Select a line of text or a command that you want to highlight, then apply the Subheading formatting option.
Open the published post to see the result. The selected content should now display using the custom style defined in your theme.
That's it! I was able to create a code-block-like appearance without installing a browser extension or modifying Blogger's built-in editor.
Final Thoughts
This approach takes advantage of Blogger's existing formatting options rather than trying to modify the editor itself.
It is a simple workaround for bloggers who need visually distinct code snippets but don't want to develop browser extensions or introduce additional tools.
One important limitation is that this method changes the visual appearance of the selected text; it does not provide true programming-language syntax highlighting. It also affects other content using the same heading style unless you apply more specific CSS rules.
Even so, for my particular needs, this was a practical way to make code snippets stand out in Blogger posts without adding unnecessary complexity.
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