encoding9 min
Understanding Encoding: Base64, URL, UTF-8 Explained
A developer deep-dive into encoding systems: how ASCII, UTF-8, Base64, and URL encoding work, why they exist, and how to avoid encoding bugs.
Read more→Base64 Image Encoder & Decoder
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Free Base64 Image Encoder & Decoder
Convert images to Base64 data URIs and decode them back to the original format. Copy the result as a CSS background-image, HTML img tag, or raw Base64 string. No need to upload files to any server — everything is processed directly in your browser.
What is Base64 Encoding
Base64 is an encoding scheme that converts binary data (like images) into an ASCII text string. It uses 64 characters (A-Z, a-z, 0-9, +, /) to represent the data, which allows you to embed images directly in HTML, CSS, or JSON without needing separate files.
When to Use Base64 for Images
Base64 is ideal for embedding small images (icons, logos, sprites) directly in CSS or HTML, eliminating extra HTTP requests and improving initial load performance. However, Base64 increases file size by 33%, so for larger images it is more efficient to use conventional files with modern formats like WebP or AVIF.
Privacy & Security
Your images never leave your device. Conversion happens entirely in your browser using JavaScript FileReader and Canvas APIs. We do not store, transmit, or log any data from your files.
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