How to Add Custom HTML / CSS to Tumblr 2025?
Want to customize your Tumblr blog design beyond the default themes? In this easy tutorial, we’ll show you how to add custom HTML and CSS to your Tumblr theme using your PC. Whether you want to personalize your blog’s look, change fonts, colors, or layout, this step-by-step guide will help you do it quickly and safely.
We’ll walk you through accessing your Tumblr settings, enabling the custom theme option, and where to insert your custom CSS code in the Advanced Options. After saving, your blog will instantly update with your unique style.
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