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How to Convert Image to Base64 String Online - Free Encoder & Decoder

Encode text, images, and files to Base64 or decode Base64 strings back to original format. Perfect for developers working with APIs, email attachments, or data URIs.

PNG, JPG, SVG Support
Text & PDF Files
Instant Processing
100% Client-Side

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How to Convert Image to Base64 String: Complete Developer Guide

What is Base64 Encoding?

Base64 is a method of encoding binary data (like images or files) into ASCII text format using 64 printable characters. This encoding allows you to embed binary data directly in text-based formats like HTML, CSS, JSON, or XML.

The encoded string is approximately 33% larger than the original binary data due to the encoding overhead, but it ensures data integrity when transmitted through text-only channels.

When to Use Base64 for Images

  • Email Signatures: Embed logos directly in HTML emails to ensure they display correctly
  • CSS Background Images: Include small icons or patterns without additional HTTP requests
  • API Payloads: Send images as part of JSON data in REST APIs
  • Single File Applications: Bundle everything in one HTML file for offline use
  • Data URLs in Canvas: Draw images on HTML5 canvas elements
  • MongoDB/NoSQL Storage: Store small images directly in document databases

Step-by-Step Tutorial: Convert PNG to Base64

  1. Step 1: Click on the "Image" button in the encoder section
  2. Step 2: Drag and drop your PNG file or click to browse
  3. Step 3: Check "Add Data URI prefix" if you need the complete data URL
  4. Step 4: Click "Encode" and your Base64 string will be generated instantly
  5. Step 5: Copy the result or download it as a text file