Base64 to Image & Image to Base64 Converter

Convert Base64 data strings to downloadable PNG/JPG images, and encode images into Base64 data URIs, HTML img tags, and CSS background snippets. 100% private in-browser tool.

Paste Base64 or Data URI String

MIME: image/pngEst. Size: 0.08 KB

Decoded Image Preview

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Quick Answer: What Is Base64 Image Encoding?

Base64 encoding translates binary image files into a 64-character ASCII text format (A–Z, a–z, 0–9, +, /):
data:[MIME-type];base64,[Encoded-String]

Every 3 bytes of binary data become 4 ASCII characters (33.3% size overhead). Ideal for micro-icons, standalone HTML templates, and eliminating HTTP latency.

Base64 Data URI Scheme Structure

data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAoAAAAKCAYAAACNMs...

Frequently Asked Questions

What is a Base64 Image Data URI?
A Base64 image data URI is a string representation of binary image data formatted as 'data:image/[type];base64,[data]'. It allows developers to embed small graphics, logos, and UI icons directly into HTML files or CSS stylesheets, eliminating extra HTTP roundtrips.
Does Base64 encoding increase file size?
Yes. Base64 encoding converts 3 bytes of binary data into 4 ASCII characters, resulting in an exact 33.3% increase in data size. However, for small icons (under 5 KB to 10 KB), the elimination of TCP handshake overhead and DNS lookups often offsets this file size penalty.
When should I embed Base64 images vs linking external image files?
Use Base64 inlining for: critical above-the-fold UI icons to eliminate Largest Contentful Paint (LCP) network hops, email templates where external image linking is blocked, and standalone offline HTML/SVG assets. Avoid Base64 for large hero images (over 20 KB) because inlined images cannot be cached independently by browser caches.
Is this converter safe for sensitive documents and photos?
Yes. Softzar performs 100% Zero-Knowledge client-side encoding and decoding directly inside your browser using the local JavaScript FileReader and Canvas APIs. Your images and Base64 strings are never transmitted to or stored on any server.
Which image formats are supported?
Our tool supports all major web raster and vector formats: PNG, JPG / JPEG, WebP, SVG, GIF, ICO, and AVIF.
How do I use a Base64 image in CSS?
In your stylesheet, use the CSS background-image property: `background-image: url('data:image/png;base64,...');`. Our tool provides a 1-click button to copy this exact formatted snippet.

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