Skip to tool
Asset inlining utility

Image to Base64 Converter & Decoder

Convert images (PNG, JPEG, WebP, SVG, GIF, AVIF) to Base64 Data URIs and decode Base64 back into image files directly in your browser. 100% private and client-side.

  • 100% Client-side conversion
  • Data URI, HTML <img> & CSS url() formats
  • PNG, JPEG, WebP, SVG, GIF, AVIF supported
Image to Base64 ConverterConvert images to Base64 Data URIs, HTML tags, and CSS strings
Working from clipboard? Paste an image anytime with Ctrl+V

Asset inlining utility

Zero round-trip image encoding and decoding

Practical context to help you turn the output into faster, more reliable experiences.
01

Streamline asset delivery with Data URIs

Embedding small icons, avatars, and placeholder graphics as Base64 Data URIs inside HTML and CSS stylesheets eliminates separate HTTP round-trips, preventing layout shifts (CLS) and speeding up initial paint times.

Our tool provides instant code snippets for raw Base64, complete Data URIs, HTML <img> tags, and CSS background-image declarations with one-click copying.

02

Local, secure, two-way conversion

Convert in both directions without your photos or graphics ever touching a third-party server. All encoding and decoding runs in your browser via HTML5 FileReader and Canvas APIs.

Easily paste any Base64 string or Data URI to inspect its visual preview, dimensions, and file size, and download the decoded image file directly to your disk with proper format detection.

Frequently Asked Questions

Why convert images to Base64 data URIs?

Converting images to Base64 allows you to embed them directly into HTML (<img> src) or CSS (background-image: url(...)) without triggering an extra HTTP request. This eliminates DNS resolution, TCP handshakes, and SSL negotiation for tiny icons, avatars, and critical above-the-fold assets.

When should I avoid using Base64 for images?

Base64 adds approximately 33% overhead to the file size and prevents the browser from caching the image independently of the HTML or CSS file. For images larger than 5-10 KB or frequently reused graphics, serving modern formats like WebP or AVIF over HTTP/2 or HTTP/3 with proper cache headers is more performant.

Which image formats are supported?

This converter supports all modern raster and vector web formats including PNG, JPEG, WebP, SVG, GIF, AVIF, BMP, and ICO. Both the Image to Base64 encoder and Base64 to Image decoder auto-detect file signatures and MIME types.

Are my images uploaded to a server?

No. The entire conversion process occurs 100% locally in your web browser using HTML5 Canvas and FileReader APIs. Your images and encoded strings never leave your device.

How do I convert a Base64 string back into an image file?

Switch to the "Base64 to Image" tab, paste your Base64 string or Data URI, and our parser will decode the binary stream, show a live preview, and provide a direct download button with the appropriate file extension.

Can I copy the output directly into HTML or CSS?

Yes. One-click copy buttons are provided for standard Data URIs, raw Base64 strings, HTML <img> tags, and CSS background-image declarations.